Table Of Contents
Resolved Caveats—Cisco IOS Release 12.2(3g)
Resolved Caveats—Cisco IOS Release 12.2(3d)
Resolved Caveats—Cisco IOS Release 12.2(3b)
Resolved Caveats—Cisco IOS Release 12.2(3a)
Resolved Caveats—Cisco IOS Release 12.2(3)
Novell IPX, XNS, and Apollo Domain
Resolved Caveats—Cisco IOS Release 12.2(2)
Resolved Caveats—Cisco IOS Release 12.2(1)M0
Resolved Caveats—Cisco IOS Release 12.2(1d)
Resolved Caveats—Cisco IOS Release 12.2(1c)
Resolved Caveats—Cisco IOS Release 12.2(1b)
Resolved Caveats—Cisco IOS Release 12.2(1a)
Resolved Caveats—Cisco IOS Release 12.2(1)
Novell IPX, XNS, and Apollo Domain
Obtaining Documentation and Submitting a Service Request
Resolved Caveats—Cisco IOS Release 12.2(3g)
Cisco IOS Release 12.2(3g) is a rebuild of Cisco IOS Release 12.2(3). All caveats listed in this section are resolved in Cisco IOS Release 12.2(3g) but may be open in previous Cisco IOS releases.
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CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of crafted IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the input queue is full. No authentication is required to process the inbound packet. Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
Resolved Caveats—Cisco IOS Release 12.2(3d)
Cisco IOS Release 12.2(3d) is a rebuild of Cisco IOS Release 12.2(3). All caveats listed in this section are resolved in Cisco IOS Release 12.2(3d) but may be open in previous Cisco IOS releases.
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An error can occur with management protocol processing. Please use the following URL for further information:
http://www.cisco.com/pcgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
Resolved Caveats—Cisco IOS Release 12.2(3b)
Cisco IOS Release 12.2(3b) is a rebuild release for Cisco IOS Release 12.2(3). The caveats in this section are resolved in Cisco IOS Release 12.2(3b) but may be open in previous Cisco IOS releases.
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When an interface is cleared, the service profile identifier (SPID) is reported on the BRI network module or WAN interface card as invalid. The SPID that is reported after the interface is cleared is still invalid. There is no workaround.
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A glare condition may occur randomly on all voice platforms in Cisco IOS Release 12.2(1a), 12.2(2)T, and 12.2 XA when a busy port is assigned to a new incoming call. A glare condition occurs when two calls are assigned to the same port. For example, if there are only two ports, and they are both busy on a call when a new call comes in without a check for glare, one of the busy ports is allocated to the new call. This condition causes the preexisting call to be disconnected and the new call to receive a busy signal. There is no workaround.
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Outgoing ISDN calls fail if the connected switch responds to an outgoing setup with a setup acknowledgement followed by a "Call Proceeding" message. This situation applies to all ISDN PRI voice platforms and has been observed in Cisco IOS Release 12.2(1) and any later release.
Workaround: Configure the isdn sending-complete command on the serial interface. This action forces ISDN to send a "sending complete" information element in the outgoing setup, so the switch will simply reply with a "Call Proceeding" message.
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A Cisco 3600 series router that is running Cisco IOS Release 12.2(1a) reloads with a bus error after an ISDN BRI outgoing call is sent from a Cisco 3600 router to an ISDN switch. This condition occurs when the Cisco 3600 router sends "SETUP" messages on the BRI port and receives "SETUP_ACK" and "CALL_PROC/w PI=8" messages. There is no workaround
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Some ISDN calls may not be cleared when the dial idle-timeout period expires. The calls end normally when the user exits or when a shutdown interface configuration command is issued. There is no workaround.
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On a Cisco AS5300 access server that is running Cisco IOS Release 12.2(3a) or 12.2(4)T, all voice calls that are running ISDN signaling may fail to process a disconnect, which leads to a buffer leak. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.2(3a)
Cisco IOS Release 12.2(3a) is a rebuild release for Cisco IOS Release 12.2(3). The caveats in this section are resolved in Cisco IOS Release 12.2(3a) but may be open in previous Cisco IOS releases.
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A Cisco router with a Cisco 2600 or 3600 hardware Virtual Private Network (VPN) module may pause indefinitely when is processing a burst of large packets (more than 2 KB). This condition occurs when the show running-config privileged EXEC command is issued while the router is passing a moderate amount of large-packet data. This condition is more likely to occur when double authentication is used (when esp-sha-hmac and ah-sha-hmac are used).
A change that was introduced in Cisco IOS Release 12.2(3)T fixes the indefinite pause but introduces a different problem. In Cisco IOS Release 12.2(3)T, the driver stops processing packets that are queued for processing when all the jumbo buffers are in use. The router does not pause indefinitely, but the VPN module stops processing packets. In either case, the router must be reloaded to correct the condition.
There is no workaround.
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Inbound calls from a channel-associated signaling (CAS) peer to a Cisco VG200 telephony voice gateway that are bound for an IP phone may experience audio dropouts. The called party will hear approximately the first half second of audio and then lose one to three seconds. After that time, the audio will return, and no further issues occur with the call after the initial dropout. Outbound calls do not experience this condition.
Workaround: Run Cisco IOS Release 12.1(5)T9.
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A Cisco AS5300 universal access server that is running Cisco IOS Release 12.2(1), 12.2(2b), or 12.2(2.4) may see the %SYS-3-INVMEMINT and %SYS-2-MALLOCFAIL error messages and cdapi_create_raw_msg tracebacks. There is no workaround.
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The frequency of 402.75 MHz has been added to the list of frequencies that will be searched immediately following the North American channel search plans.
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Calls that are sent to a Stack Group Bidding Protocol (SGBP) member that is set to forward only to an offload server are not properly forwarded. This condition is observed in Cisco IOS Release 12.2(1.1) and later releases. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.2(3)
This section describes possibly unexpected behavior by Cisco IOS Release 12.2(3). All the caveats listed in this section are resolved in Cisco IOS Release 12.2(3). This section describes severity 1 and 2 caveats and select severity 3 caveats.
Access Server
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Symptoms Modem recovery does not startup as expected when abnormal behavior (such as a no answer condition or double digital signal processor failures [DSP]) is observed on a Modem ISDN channel aggregation (MICA) technologies modem. This symptom may cause bad modems to be allocated for a call and a low call success rate (CSR) on the system.
Conditions This symptom is observed on a MICA modem on a Cisco router.
Workaround There is no workaround.
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Symptoms The following error and traceback messages may be observed on a Cisco AS5800:
%TTY-3-AUTOCONFIG: TTY1/9/29: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/33: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/34: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/57: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/62: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/56: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/75: Modem auto-configuration failed
%TTY-3-AUTOCONFIG: TTY1/9/64: Modem auto-configuration failed Queued messages:
%SYS-3-LOGGER_FLUSHING: System pausing to ensure console debugging output. %SYS-3-LOGGER_FLUSHED: System was paused for 00:00:02 to ensure console debugging output.
%SYS-2-MALLOCFAIL: Memory allocation of 1048 bytes failed from 0x6053A7F0, poo l Processor, alignment 0 -Process= "Crash writer", ipl= 0, pid= 120 -Traceback= 604412B0 60442F08 6053A7F8 6046BD4C 604743BC 604006DC 604008AC 60437D2C 60437D18 %SYS-2-CFORKMEM: Process creation of Async tty Reset failed (no memory). -Process= "Serial Background", ipl= 0, pid= 7 -Traceback= 60463CD0 6045605C 6065EB10 6065ED80 609C4F30 6000FF3C 60437D2C 60437D18 %MODEM-1-DL_FAIL: Firmware download failed for slot 3341 module_mask 609A8D88 %SYS-3-LOGGER_FLUSHED: System was paused for 00:00:00 to ensure console debugg ing output.The Cisco AS5800 then reloads because of the following bus error:
System returned to ROM by bus error at PC 0x6097DD50, address 0xDEADBEFB at 10:43:38Conditions This symptom is observed on a Cisco AS5800 that is running Cisco IOS Release 12.1(7.2).
Workaround There is no workaround.
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Symptoms A software-forced reload because of a bus error may occur on a Cisco AS5300.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.2(0.18).
Workaround There is no workaround.
Basic System Services
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Symptoms A Cisco 7500 series may reload because of a software-forced reload.
Conditions This symptom is observed on a Cisco 7500 series that is configured with compression and that is running Cisco IOS Release 12.0(7.03).
Workaround There is no workaround.
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Symptoms Two Cisco multiservice access concentrators may not be able to place Voice over Frame Relay (VoFR) calls to each other.
Conditions This symptom is observed on a Cisco MC3810 that is running Cisco IOS Release 11.3(1)MA7 and a Cisco MC3810 that is running Cisco IOS Release 12.0(7)XK1.
Workaround There is no workaround.
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Symptoms Hardware compression (SA-COMP/1) does not work as expected when it is used with Multilink PPP (MLP) on a router. The output of the show compress EXEC command may show software compression and all fields as zero. Not all data will be affected but there is no way of knowing if compression is occurring.
Conditions This symptom is observed on a Cisco 7200 series or a Cisco 3640.
Workaround There is no workaround.
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For a Cisco Versatile Interface Processor 2-10 (VIP2-10), VIP2-15, VIP2-20, or VIP2-40, revisions 73-1684-01, 73-1684-02, and 73-1684-03 have ROMMONs that cannot boot large Cisco IOS images. VIP2-50s and the previously mentioned VIPs that are revision 73-1684-04 or a later revision have a ROMMON that can boot larger Cisco IOS images. VIP4s are not affected. You can use the show controller cbus command to see which version of ROMMON is on your card. The 17-2674-0X parts contain VIP software ROMMON version 17.0 which fails. The 17-4327-01 parts contain VIP software ROMMON version 115.0, which works. There is no workaround.
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Symptoms A Cisco AS5300 may reload with a bus error.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.1(3.1).
Workaround There is no workaround.
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Symptoms Voice over ATM does not carry the "called_oct3" and the "calling_oct3" fields in the setup message.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(3)T, 12.1(3)XI, or Release 12.2.
Workaround There is no workaround.
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Symptoms A misleading message may be displayed when a T1 controller on a Cisco MC3810 is shut down.
Conditions This symptom is observed on a Cisco MC3810 that has a T1 controller and that is running Cisco IOS Release 12.2 T.
Workaround There is no workaround.
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Symptoms A software-forced reload may occur on a Cisco 7500 series after interfaces are configured.
Conditions This symptom is observed on a Cisco 7500 series when quality of service (QoS) is configured on more than 512 interfaces.
Workaround There is no workaround.
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Symptoms A PPC gcc.97r1-9804.ppc compiler error occurs on a 64-bit data movement.
Conditions This symptom is observed on a Cisco router.
Workaround Use Cisco IOS Release 12.1(5)T or Release 12.2.
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Symptoms A software-forced reload may occur on a router when the Simple Network Management Protocol (SNMP) is used to copy a configuration such as the following:
snmpset -t 180 -r 2 10.200.40.10 cisco.local.lsystem.netConfigSet.172.17.247. 195 octetstring config2The router displays the following message, indicating that it is trying to free memory that has already been freed:
%SYS-2-FREEFREE: Attempted to free unassigned memory at 62F46994, alloc 6030DF8C, dealloc 602423B8Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5.02).
Workaround Use the following SNMP commands:
snmpset 10.200.40.10 ccCopySourceFileType.11 integer 1
snmpset 10.200.40.10 ccCopyDestFileType.11 integer 4
snmpset 10.200.40.10 ccCopyServerAddress.11 ipaddress 172.17.247.195
snmpset 10.200.40.10 ccCopyFileName.11 octetstring config
snmpset 10.200.40.10 ccCopyEntryRowStatus.11 integer 1•
Symptoms PPP negotiation fails when asynchronous PPP is used with dialer profiles while Cisco Discovery Protocol (CDP) is enabled.
Conditions This symptom is observed on a Cisco AS5800 that is running Cisco IOS Release 12.1(5.03).
Workaround Use the no cdp run interface configuration command.
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Symptoms After one or two calls are made on a router, the port remains in an off-hook condition. The Foreign Exchange Station (FXS) voice interface card (VIC) and direct inward dial (DID) VIC fails to recognize an on-hook condition.
Conditions This symptom is observed after one or two calls are made on a Cisco router that has a voice interface card (VIC).
Workaround There is no workaround.
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Symptoms NetFlow and distributed Cisco Express Forwarding (dCEF) do not function properly on an enhanced Gigabit Ethernet Interface Processor (GEIP+) that has 256 MB of DRAM.
Conditions This symptom is observed on an enhanced Gigabit Ethernet Interface Processor (GEIP+) that has 256 MB of DRAM.
Workaround There is no workaround.
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Symptoms A Cisco AS5400 may reload when AAA system accounting cannot be sent successfully to a RADIUS server.
Conditions This symptom is observed on a Cisco AS5400 that is running Cisco IOS Release 12.2(0.01).
Workaround There is no workaround.
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Symptoms A router may reload when channel-associated signaling (CAS) calls are running. This symptom occurs when the router attempts to access a memory chunk that has already been freed.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(2)T.
Workaround There is no workaround.
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Symptoms The virtual circuit (VC) bundle state is reported as up even when the protected VC is down.
Conditions This symptom is observed on a VC bundle that is on a Cisco router.
Workaround There is no workaround.
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Symptoms If the SrBuildSnmpMessage fails, and when the Simple Network Management Protocol (SNMP) engine performs a memcpy operation on the invalidated memory, memory corruption may cause a router to reboot.
Conditions This symptom is observed on a Cisco router that has a Route Switch Processor (RSP-4) and that is running Cisco IOS Release 12.2(0.04).
Workaround There is no workaround.
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Symptoms Spurious memory access may occur on every Compressed Real-Time Transport Protocol (CRTP) packet when distributed Compressed Real-Time Transport Protocol (dCRTP) is configured on an interface.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(0.05).
Workaround Disable CRTP.
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Symptoms Round-Trip Time (RTT) measurements may be incorrect if the measurement cycle begins just before 00:00:00 Coordinated Universal Time (UTC) time.
Conditions This symptom affects all probe types.
Workaround There is no workaround.
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Symptoms A Cisco 7200 series that has the following alignment errors may observed the errors increasing at a rate of 1 per second:
%ALIGN-3-SPURIOUSConditions This symptom is observed on a Cisco 7200 series that is running Cisco IOS Release 12.1(5a)E.
Workaround There is no workaround.
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Symptoms ATM adaptation Layer 2 (AAL2) does not upspeed when a V.21 fax tone is present.
Conditions This symptom is observed on a Cisco MC3810 that is running Cisco IOS Release 12.1 T.
Workaround There is no workaround.
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Symptoms When a call is made from the T1 interface of a Cisco MC3810 to another Cisco MC3810 over Frame Relay, the called party will clip the voice of the calling party when the parties talk at the same time.
Conditions This symptom is observed on a Cisco MC3810 that is running Cisco IOS Release 12.2(1).
Workaround There is no workaround.
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Flash memory is put in a "Device not programmable status" state. This situation is consistently seen with certain images on the Cisco 1600 series platform and with vendor-specific Flash memory. The router displays the following error message:
%Error: PCMCIA flash sizing mismatch Size reported = 16384KB, calculated = 16640KBThe image should run correctly although the information for a Flash memory card is incorrect. The Flash memory device is locked so you cannot use the Flash memory. There is no workaround.
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Symptoms Export packets that are sent by a router may be dropped and may not make it to the collector.
Conditions This symptom is observed even though NetFlow export is configured correctly on a Cisco router that is running Cisco IOS Release 12.2.
Workaround There is no workaround.
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Symptoms RADIUS format D does not work normally and major changes are required in the RADIUS server to enable the server to authenticate users.
Conditions This symptom is observed on a Cisco 6400 that is running Cisco IOS Release 12.1(4.04)DC1.
Workaround There is no workaround.
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When you set up calls on a Cisco AS5800 series universal access server, the access server displays the following messages:
%DIAL3-3-MSG:
%NP-3-NAKRSP: NAK Response Received
- command 0x1502, result code 0x8010, msg id 0x15FF, session id 0x65, msg tag 0x0
%NP-3-NAKRSP: NAK Response Received
- command 0x1502, result code 0x8010, msg id 0x15FF, session id 0x66, msg tag 0x0There is no workaround.
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A Cisco 3620 router that is running Cisco IOS 12.1(5.3)T may reload with a bus error after running out of memory when the router accesses the following MIB counters:
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There is no workaround.
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Symptoms A Cisco MC3810 may pause indefinitely when an inbound Voice over Frame Relay (VoFR) call is received and destined for the voice ports. The Cisco MC3810 does not respond to the break sequence and must be rebooted.
Conditions This symptom is observed on a Cisco MC3810 that is running Cisco IOS Release 12.1(5)T4 after the debug vpm dsp EXEC command is enabled. This symptom is not observed when other debug commands are enabled.
Workaround There is no workaround.
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Symptoms Simple Network Management Protocol (SNMP) MIBS that use read-create objects in their rows (such as the SNMP ping MIB or the ConfigCopy MIB) may cause a router to reload unexpectedly.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1 or Release 12.2.
Workaround Disable SNMP.
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Symptoms When a vendor-specific browser is used to configure a router, the request pauses indefinitely and times out. The command is not performed, and no output is returned.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1 or Release 12.2.
Workaround Use an earlier version of the browser.
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Symptoms A router may reload with a segmentation violation (SegV) exception when the random-detect-group global command that has been configured on a permanent virtual connection (PVC) is edited.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(7).
Workaround Remove the random-detect-group global configuration command from the permanent virtual connection (PVC), edit, and then reattach the command to the PVC.
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Symptoms A reload may occur when two authentication, authorization, and accounting (AAA) configurations options are configured at the same time. This may include the two following commands:
aaa accounting update periodic number
aaa accounting resource default start-stop-failure group radiusConditions This symptom is observed on a Cisco AS5400 that is running Cisco IOS Release 12.1(5)T.
Workaround There is no workaround.
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Symptoms Some interfaces on a Route Switch Processor (RSP) or a Versatile Interface Processor (VIP) may remain down after the fix for CSCdt75868 has been integrated.
Conditions This symptom is observed on an RSP or VIP interface.
Workaround There is no workaround.
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A Cisco 1401 router that is running Cisco IOS Release 12.2(0.14)T may experience a memory leak that is associated with the Simple Network Management Protocol (SNMP) ConfCopyPro process. There is no workaround.
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Symptoms An MPC860 quad integrated communications controller on a Cisco MC3810 interprets the idle line binary synchronous communication (BSC) characters (FFs) as a frame and ships it across a Block Serial Tunnel (BSTUN). The idle line characters do not constitute a valid frame and should not be shipped to the upper layer.
Conditions This symptom is observed on an MPC860 quad integrated communications controller on a Cisco MC3810.
Workaround There is no workaround.
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Symptoms A Cisco 1600 series may fail to boot after a Rivest, Shamir, and Adleman (RSA) key pair is generated and the crypto ca identity global configuration command is configured.
Conditions This symptom is observed on a Cisco 1600 series that is running Cisco IOS Release 12.1(5)T5.
Workaround There is no workaround.
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Symptoms A Cisco 1000 series may fail to boot up.
Conditions This symptom is observed on a Cisco 1000 series that is running the Cisco c1000-y-mz image of Cisco IOS Release 12.1(7.6).
Workaround There is no workaround.
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Symptoms A Cisco 6400 Node Switch Processor (NSP) may reload with a bus error exception.
Conditions This symptom is observed on a Cisco 6400 NSP that is running Cisco IOS Release 12.1(5)DC after a long tunnel-session-auth-id or tunnel-password is configured.
Workaround There is no workaround.
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Symptoms The Cisco Discovery Protocol (CDP) may fail to correctly match identical neighbor entries and build a list of duplicated neighbor entries on the CDP neighbor table. The duplicate neighbor entries can be seen in the output when the show cdp neighbor EXEC command is entered. This symptom may cause the CDP to consume a higher than normal amount of memory on the router.
Conditions This symptom is observed on a Cisco 2500 series that is running Cisco IOS Release 12.0(11).
Workaround Set the CDP timer to a value that is comparable to the value of the CDP hold-down timer. For example, with the CDP hold-down timer set at the default of 180 seconds, the CDP timer can be set to 150 seconds. This setting will help to decrease the number of duplicate entries on the CDP neighbor table.
Alternate Workaround Disable CDP.
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When an HTTP server is enabled and local authorization is used, it is possible, under some circumstances, to bypass the authentication and execute any command on the device. It that case, the user will be able to exercise complete control over the device. All commands will be executed with the highest privilege (level 15).
All releases of Cisco IOS software, starting with the release 11.3 and later, are vulnerable. Virtually, all mainstream Cisco routers and switches running Cisco IOS are affected by this vulnerability.
Products that are not running Cisco IOS software are not vulnerable.
The workaround for this vulnerability is to disable HTTP server on the router or to use Terminal Access Controller Access Control System (TACACS+) or Radius for authentication.
This advisory will be posted at http://www.cisco.com/warp/public/707/IOS-httplevel-pub.html
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The advisory is posted at http://www.cisco.com/warp/public/707/NTP-pub.shtml. Please read the advisory for the most up to date information.
Network Time Protocol (NTP) is used to synchronize time on multiple devices. A vulnerability has been discovered in the NTP daemon query processing functionality. This vulnerability has been publicly announced.
The workarounds for this vulnerability are described in the Workarounds section of the advisory.
The following products are identified as affected by this vulnerability:
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The following products are not affected:
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Cisco is continuing to research this issue in other products that may be affected. Unless explicitly stated otherwise, all other products are considered to be not affected.
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Symptoms Radius attribute 4 in a Node Route Processor (NRP) configuration disappears after a Cisco NRP is reloaded.
Conditions This symptom is observed on a Cisco 6400 NRP that is running Cisco IOS Release 12.1(5)DC.
Workaround There is no workaround.
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Symptoms After the fix for CSCdt78099 has been removed, system accounting becomes periodic when it is not suppose to be.
Conditions This symptom is observed on a Cisco AS5850 that is running Cisco IOS Release 12.1 T.
Workaround There is no workaround.
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A Cisco 3660 router may fail to boot when the router is power-cycled or reloaded, if the total number of either the ccs encap or the ccs connect interface commands exceeds 10 in the startup configuration.
The following error messages are logged at the console port at the time of the failure, before the router reloads with a bus error exception:
%ALIGN-1-FATAL:Illegal access to a low addressWorkaround: Deconfigure part of the configuration, to bring down the number of the ccs encap or the ccs connect interface commands to a total of 10 or fewer. The entire configuration can be input after the router has booted up.
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Symptoms A Cisco AS5300 may reload at the radius_add_redirected_station process.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.2(0.5)g.
Workaround There is no workaround.
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Symptoms Three Cisco 7206 routers that have the Network Processing Engine (NPE-400) may reload simultaneously after the software is upgraded to Cisco IOS Release 12.1(5)T7.
Conditions This symptom is observed on three Cisco 7206 routers that have been running Cisco IOS Release 12.1(5)T7 for a period of approximately two weeks.
Workaround There is no workaround.
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A Cisco AS5850 universal access server may suffer a reload under stress if it has AAA periodic accounting configured.
Workaround: Disable AAA periodic accounting on the access server.
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Symptoms A Cisco 2600 series that is configured with the Service Assurance Agent (SA Agent) may display the following error message when the Simple Network Management Protocol (SNMP) is repeatedly polled for rttMonJitterStats:
%SYS-2-MALLOCFAIL: Memory allocation of -2132490248 bytes failed from 0x8064BDBC, pool Processor, alignmentConditions This symptom is observed on a Cisco 2600 series that is running Cisco IOS Release 12.1(7).
Workaround There is no workaround.
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A Cisco router that is running Cisco IOS Release 12.1(7.3)E or 12.2(1.3) may experience a reload when a vendor-specific challenge handshake authentication protocol authentication is performed through a RADIUS server when the wrong username or password is entered and when the RADIUS server returns an access-reject with at least one attribute other than the vendor-specific attribute (VSA). There is no workaround.
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Symptoms Some calls may be rejected.
Conditions This symptom is observed on all voice platforms that have the call fallback mechanism enabled.
Workaround There is no workaround.
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Symptoms A router may reload after random-detect is configured and then unconfigured on an interface.
Conditions This symptom is observed on a Cisco router that has the Network Processing Engine (NPE-200).
Workaround There is no workaround.
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Symptoms A router may reload when a Dynamic Host Configuration Protocol (DHCP) operation is scheduled.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(2.3).
Workaround There is no workaround.
DECnet
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Symptoms A router may reload if the show decnet neighbor EXEC command is entered while decnet conversion global configuration command is configured.
Conditions This symptom is observed on a Cisco Catalyst 4000.
Workaround There is no workaround.
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Symptoms DECnet fast switching does not work on 802.1q trunks.
Conditions This symptom is observed when 802.1q trunks are configured on a Cisco router.
Workaround Disable fast switching of DECnet packets by entering the no decnet route-cache command on the primary interface that have the subinterfaces that are using dot1q encapsulation.
EXEC and Configuration Parser
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A Cisco 3640 router that is running Cisco IOS Release 12.1 that is configured with the autoselect {ppp} line configuration command may experience a TTY line lock-up and excessive CPU usage when an EXEC-based PPP session pauses indefinitely after a modem connection is dropped on a random tty line.
Workaround: Clear the line manually using the clear line line-number privileged EXEC command.
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Symptoms When large amounts of character mode traffic are downloaded from a Telnet client, the CPU utilization for the corresponding EXEC session on a Cisco AS5300 series increases to over 90 percent.
Conditions This symptom is observed on a Cisco AS5300 series that is running Cisco IOS Release 12.0(11.06).
Workaround There is no workaround.
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Symptoms The network command under a Border Gateway Protocol (BGP) configuration does not show up in the running-config.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(0.15)T.
Workaround There is no workaround.
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A bus error may occur when the following privileged EXEC commands are entered:
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There is no workaround.
IBM Connectivity
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Symptoms When Frame Relay Access Support Border Access Node (FRAS BAN) is configured with dial-on-demand routing (DDR) backup, the backup is only driven if the primary interface enters the "down/down" state. If the data-link connection identifier (DLCI) is lost, the interface enters the "up/down" state and the backup is not driven. This feature is working as it is designed but it is of limited use to the customer.
Conditions This symptom is observed when Frame Relay Access Support Border Access Node (FRAS BAN) is configured with dial-on-demand routing (DDR) backup.
Workaround There is no workaround.
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Symptoms Data-link switching (DLSw) Ethernet redundancy does not work on Inter-Switch Link (ISL)-encapsulated subinterfaces of Versatile Interface Processor (VIP) cards that have Ethernet port adapters on Cisco 7500 series routers.
Conditions This symptom is observed on ISL-encapsulated subinterfaces of VIP cards that have Ethernet port adapters.
Workaround Do not use DLSw Ethernet redundancy but configure support for DLSw by entering transparent bridge group commands.
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Symptoms A router may reload when Qualified Logical Link Control (QLLC) tunneling tests are performed.
Conditions This symptom is observed on a Cisco router that has a Route Switch Processor (RSP) card and that is running Cisco IOS Release 12.1(3.03).
Workaround There is no workaround.
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Symptoms When a data-link switching (DLSw) circuit is established on a Cisco 3640, the router sends a receiver ready (RR) frame to the secondary station indicating that it is ready to accept Information frames (I-frames). The station responds rapidly with the I-frame, which arrives at the router about 0.5 milliseconds after the router has sent the RR frame. With Priority peers, a race condition can develop between the first I-frame and the contacted Switch to Switch Protocol (SSP) message if they are over different ports. If the I-frame is received first, it is dropped.
Conditions This symptom is observed on a Cisco 3640 that is running Cisco IOS Release 12.0(8).
Workaround There is no workaround.
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Symptoms When service is interrupted on a Frame Relay access support (FRAS) border access node (BAN) that is configured to use more than one Frame Relay permanent virtual circuit (PVC) that is attached to one physical serial interface, a router does not send exchange identification (XID) to both data-link connection identifiers (DLCIs) to initiate a session.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(2).
Workaround There is no workaround.
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Symptoms A Cisco 2600 series may pause indefinitely.
Conditions This symptom is observed on a Cisco 2600 series that is running Cisco IOS Release 12.1(5)T under very high Binary Synchronous (Bisync) traffic conditions.
Workaround There is no workaround.
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Symptoms Data-link switching (DLSw) Ethernet redundancy may fail to send the IWANTIT and CKT_GONE frames if the dlsw timer explorer-wait-time global configuration command is configured. Because of this symptom, the Systems Network Architecture (SNA) client cannot reestablish the circuit.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5).
Workaround There is no workaround.
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An information frame (IFrame) is seen on the WAN trace but not on the Channel Interface Processor (CIP) trace. This occurs when there is a single logical unit (LU) on a physical unit (PU). The frame will pause indefinitely at llc txQ. There is no workaround.
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Symptoms A router that is configured for Frame Relay access support (FRAS) border access node (BAN) does not turn on the routing information indicator (RRI) when explorer frames are sent out on the Frame Relay interface.
Conditions This symptom is observed on a Cisco router that is configured for FRAS BAN and that is running Cisco IOS Release 12.1(4).
Workaround There is no workaround.
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You may receive the following information every day after upgrading Cisco IOS Release 11.3 to Release 12.0(13):
%TCP-2-INVALIDTCPENCAPS: Invalid TCB encaps pointer:
0x0
-Process= "IP Input", ipl= 0, pid= 12
-Traceback= 60382C2C 60383F14 60A56FF0 60A583F8 60A569E4 60A46840 60A4E58C
60382B78 602EAE00 602ECB84 603233D4 6030BD04 6030A200 6030A2FC 6030A470 6
02973ACThis situation is specific to a data-link switching (DLSw) border peer network. It does not happen in a standard DLSw environment with only configured or promiscuous DLSw peers. There is no workaround.
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A Cisco 7206 router that is running Cisco IOS Release 12.0(15) may reload because of a bus error exception at PC 0xD0D0D7D because of a data-link switching Plus (DLSw+) installation that is using Qualified Logical Link Control (QLLC) as a Data Link Control (DLC). There is no workaround.
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A host needs to initiate the connection only. Also, once an ATM fails it needs to be removed from the multidrop polling list. To do this, use the Synchronous Data Link Control (SDLC) partner command for each address is configured with the keyword inbound and the sdlc address command is configured with the passive keyword. Also, the no sdlc slow-poll interface configuration command is configured.
The host initiates a request and the Cisco 2600 router starts sending Set Normal Response mode (SNRMs) to the physical unit (PU). If the PU is down and does not respond to the SNRMs then the router should stop sending them after it has retried sdlc n2 times (default 20). But in this case, the router continues sending the SNRMs forever.
This is the configuration on the sdlc (controller) side:
interface Serial0/1 bandwidth 4800 no ip address encapsulation sdlc no keepalive ignore-dcd sdlc role primary sdlc vmac 1000.4018.3900 sdlc poll-pause-timer 200 sdlc N2 7 sdlc address 01 passive sdlc
partner 5000.8804.40c0 01 inbound sdlc address 02 passive sdlc
partner 5000.8804.40c0 02 inbound sdlc address 04 passive sdlc
partner 5000.8804.40c0 04 inbound sdlc address 05 passive sdlc
partner 5000.8804.40c0 05 inbound sdlc address 07 passive sdlc
partner 5000.8804.40c0 07 inbound sdlc address 08 passive sdlc
partner 5000.8804.40c0 08 inbound no sdlc slow-poll sdlc dlsw defaultThere is no workaround.
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On a Cisco 7500 series router when a serial port adapter (PA) is configured with Serial tunnel (STUN) encapsulation, the Route Switch Processor (RSP) performs a cbus complex. This situation happens when the encapsulation is changed from or to Serial Tunnel Serial Tunnel (STUN). There is no workaround.
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Channel Interface Processor (CIP) to Synchronous Data Link Control (SDLC) through Data-link switching (DLSw) local switching on a Cisco router may lose a path information unit (PIU) outbound over the serial interface. Network Control Program (NCP) reports degraded performance and a missing PIU. This situation is caused by carrier transitions occurring on the line. When the transition occurs, the Interface Descriptor Block (IDB) is marked down until the carrier comes back up. If the carrier is down when SDLC tries to encapsulate the packet, the encapsulation fails and the packet is silently discarded. There is no workaround.
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Symptoms Data-link switching (DLSw) Ethernet load balance does not work in Cisco IOS Release 12.1(7) for resources that are reachable local to the router with more than one cache entry in the DLSw reachability cache for a given resource such as a MAC address or a NetBIOS name. When this symptom occurs, a user might see bogus routing information field (RIF) entries in the reachability cache for resources that are reachable.
Conditions When this symptom occurs, DLSw will cache up to four entries for a given resource and then load balance between the four entries if DLSw is configured to do so. Otherwise, the first entry for a given resource is used. This symptom affects the second, third, or fourth entry only if there is no RIF.
Workaround There is no workaround.
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Symptoms A router that is configured for data-link switching (DLSw) Ethernet redundancy may reload with a bus error if circuits are established while peer connections are torn down.
Conditions This symptom is observed on a Cisco router that is configured for DLSw Ethernet redundancy and that is running Cisco IOS Release 12.1(2)E.
Workaround Use DLSw with transparent bridging.
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Symptoms A buffer leak may occur on a Cisco 2600 series when a LAN network manager is configured.
Conditions This symptom is observed on a Cisco 2600 series that is running Cisco IOS Release 12.1(5)T.
Workaround There is no workaround.
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Symptoms The input of the bsc contention address interface configuration command defaults to a decimal. Hexadecimal input can be forced on the command by entering the "0x" prefix. The issue is that the show running-config EXEC command shows the bsc contention address interface configuration command with a hexadecimal value but without the "0x" prefix. If the configuration is saved and the system is rebooted, the router does not accept the bsc contention address interface configuration command and removes it from the configuration.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1.
Workaround Add the command again to the configuration.
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Symptoms A router that is running the data-link switching plus (DLSw+) Ethernet Redundancy feature may reload when two redundant domains are merged.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1.
Workaround There is no workaround.
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A Cisco router that is running Data-Link Switching (DLSw) Ethernet Redundancy may reload when two redundant domaines are merged. There is no workaround.
Interfaces and Bridging
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Symptoms Subinterfaces that are created on a Cisco 7500 series Route Switch Processor (RSP) may not be able to route AppleTalk packets. Sniffer tests show that the cable range is being reached even though the router does not respond to the appletalk getzonelist-filter interface configuration command. The router is unable to ping any of the connected Apple machines even though Routing Table Maintenance Protocol (RTMP) appears to be working.
Conditions This symptom is observed on a Cisco 7500 series RSP that is running Cisco IOS Release 12.0.
Workaround There is no workaround.
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Symptoms Command failures and "ATMPA-3-SARCRASH" messages may be observed on an enhanced ATM port adapter (ATM-PA-A3) and the port adapter may power down. After the "PA-3-DEACTIVATED" power down message is displayed, the configuration of the ATM port adapter becomes missing from the configuration. Under rare circumstances, the router may reload.
Conditions This symptom is observed on an ATM-PA-A3 port adapter on a Cisco 7200 series that is running Cisco IOS Release 12.0(6).
Workaround There is no workaround.
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A Virtual Private Network (VPN) with 802.1q on a PA-FE port adapter works with Cisco Express Forwarding (CEF) but not distributed Cisco Express Forwarding (dCEF). There is no workaround.
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Symptoms A router may "glitch" (pulse-low) the request to send (RTS) signal when "pulse-time" is coded for the data terminal ready (DTR) signal. In some instances, RTS follows the behavior of DTR. At other times, RTS simply glitches low for a few milliseconds. This symptom may cause interoperability problems when certain data communications equipment (DCE) or a particular interface wiring is used (for example, looping RTS back to data carrier detect (DCD).
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(1).
Workaround There is no workaround.
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Symptoms A router that has a Gigabit Ethernet Interface Processor (GEIP) may reload after it has booted up.
Conditions This symptom is observed on a Cisco 7507 router that has a GEIP that is installed in slot 5 and slot 6. This symptom is observed when the Cisco 7507 is upgraded to Cisco IOS Release12.0(11)S.
Workaround Use Cisco IOS Release 11.1(33)CC.
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Symptoms An EtherSwitch 12E/2FE port adapter (PA-12E/2FE) may fail to initialize.
Conditions This symptom is observed on a PA-12E/2FE on a Cisco 7200 series that has a Network Processing Engine (NPE-400) and that is running Cisco IOS Release 12.1(3a)E. The Network Processing Engine (NPE-300) can be used with the PA-12E/2FE without any problems.
Workaround Use the Network Processing Engine (NPE-300).
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Enabling Multilink PPP on some interfaces on a PA-MC-2T3 card together with distributed Cisco Express Forwarding (dCEF) may cause tracebacks. There is no workaround.
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Symptoms When a Cisco 7200 series that has a Packet over SONET (POS) port adapter is reloaded, the POS subinterfaces may not come up in the enabled state.
Conditions This symptom is observed on a Cisco 7200 series that has a POS port adapter.
Workaround Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the POS interface.
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Symptoms A virtual circuit descriptor (VCD) that is configured on a given bridge group may erroneously in the output of another bridge group when the show bridge group [verbose] privileged EXEC command is entered.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5). This symptom occurs when ATM virtual circuits (VCs) are configured into several bridge groups.
Workaround Enter the clear bridge EXEC command.
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Symptoms When the dot5StatsTokenErrors counter is queried, the value that is returned is the value for the dot5StatsBurstErrors counter instead of the dot5StatsTokenErrors counter
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(07)XE01.
Workaround There is no workaround.
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Symptoms If a fiber is detached and if the keepalive is removed from the Packet over SONET (POS) interface by entering the no keepalive command, the like may remain up indefinitely after the patch cord is removed. An output that is similar to the following may be displayed when the keepalives are set to one second:
00:30:06: %SONET-4-ALARM: POS1/0/0: SLOS
00:30:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface POS1/0/0, changed
state to down
00:30:10: %OSPF-5-ADJCHG: Process 1, Nbr 10.0.2.4 on POS1/0/0 from FULL to
DOWN, Neighbor Down: Interface down or detached
00:30:10: %LINK-3-UPDOWN: Interface POS1/0/0, changed state to downThe line protocol does not go down immediately after a section loss of signal (SLOS) alarm condition is detected. Instead, the line protocol goes down only after three missed keepalives.
Conditions This symptom is observed on a Cisco 7000 series that is running Cisco IOS Release 12.1(4.04)T3 or Release 12.2.
Workaround There is no workaround.
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Multicast traffic on a nonbridging subinterface may cause spurious access in tbridge_irb_inline, when there is at least one bridging subinterface on the same physical interface. There is no workaround.
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Symptoms The show compress EXEC command displays only the information about the statistics of the first data-link connection identifier (DLCI) even when the interface is configured for compression on multiple DLCIs.
Conditions This symptom is observed on a Cisco 2600 series, Cisco 3600 series, or Cisco 7200 series when Frame Relay encapsulation is used and when multiple DLCIs are configured with Frame Relay Forum payload compression (FRF.9).
Workaround There is no workaround.
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Symptoms The ATM permanent virtual circuit (PVC) subinterface of a Cisco 7206VXR may intermittently drop packets from the output queue. When this symptom occurs, the PVC remains up and continues to send traffic that is originating from the Cisco 7206VXR.
Conditions This symptom is observed on a Cisco 7206VXR that has a Network Processing Engine (NPE-300), an enhanced ATM port adapter (PA-OC-3), and some ATM subinterfaces. Cisco Express Forwarding (CEF) and fast switching are not used in this setup.
Workaround Reenter the atm pvc interface configuration command on the ATM subinterfaces.
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Symptoms A protected Packet over SONET (POS) interface may continue to send PPP Link Control Protocol (LCP) requests and wink the alarm indication signal (AIS) after a timeout occurs and confuse the provider.
Conditions This symptom is observed on a protected POS interface that is configured with PPP while the protected POS interface is in the automatic protection switching (APS) protect state. This symptom is observed on a Cisco router after it has been upgraded from Cisco IOS Release 12.0(14)S2 to Release 12.0(15)S.
Workaround Use High-Level Data Link Control (HDLC) encapsulation.
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Symptoms A Cisco 7200 series or Cisco 7500 series may stop forwarding packets on one or more virtual connections (VCs).
Conditions This symptom is observed on a Cisco 7200 series or Cisco 7500 series that has an enhanced 1-port ATM OC-3c/STM-1 multimode port adapter (PA-A3-OC3) and that is running Cisco IOS Release 12.0(10)S3.
Workaround Enter the clear interface privileged EXEC command to restore the Cisco 7200 series or Cisco 7500 series to the normal working condition.
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A Cisco router reloads with alignment errors and displays the following error message:
ALIGN-1-FATAL: Illegal access to a low address addr=0x13C, pc=0x6056C83C, ra=0x603E8D4C, sp=0x62177800There is no workaround.
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When a RJ-45 cable is disconnected from a 10BaseT Ethernet port adapter (PA-4E or PA-8E) that is installed on a Cisco 7500 router, the line protocol goes down and remains down even after the RJ-45 cable is reconnected.
Workaround: Enter the shut command followed by the no shut command on the 10BaseT Ethernet port adapter interface to restore the line protocol after the RJ-45 cable is reconnected to the port adapter.
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Symptoms A Cisco 7507 may reload with a bus error.
Conditions This symptom is observed on a Cisco 7507 when it is running Cisco 56-bit encryption IP Security (IPSec) and Token Ring interfaces.
Workaround There is no workaround.
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The gigabit port on a Cisco Catalyst 4000 gateway card fails to come up because the FX1000 does not work properly.
Workaround: Use the Cisco IOS release that contains the fix for this caveat.
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When a permanent virtual circuit (PVC) on a PA-A2 port adapter ATM interface is overloaded, the Operation, Administration, and Maintenance (OAM) cell drops and causes the PVC to go down. This situation does not affect a PA-A3 port adapter interface. There is no workaround.
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Symptoms The traffic counters on an ATM subinterface may display values that are different from the traffic counters on the main interface when the show interface EXEC command is entered. The counters on the subinterface are incorrect and the counters on the main interface are correct.
Conditions This symptom is observed on the ATM subinterface of a Cisco router. This symptom may also be observed when a Simple Network Management Protocol (SNMP) walk is performed on the ifEntry table.
Workaround There is no workaround.
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A Cisco 7200 series provider edge (PE) router may zero out all the contents of the packet beyond the ATM adaptation layer 5 (AAL5) header when Cisco Express Forwarding (CEF) is switching an IP packet from a customer edge (CE) router to a remote virtual private network (VPN) destination. This problem occurs only when the input port adapter is the i82543-based 2 port FastEthernet port adapter (PA-2FE) I/O controller. There is no workaround.
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Pings fail for an IP datagram size larger than 586 bytes on an ISDN BRI D channel when configured for bridging with X.25. Process-level transparent bridging behaves erratically. There is no workaround.
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Symptoms After a router is reloaded, there may not be any connectivity between the serial interfaces that have channel groups configured.
Conditions This symptom is observed on a Cisco router that has serial interfaces and that is running Cisco IOS Release 12.0(16.05)S, 12.1, or Release 12.1(6.09)E.
Workaround Enter the shutdown interface configuration command followed by the no shutdown interface configuration command to restore connectivity between the serial interfaces.
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Symptoms A Cisco 7500 series Route Switch Processor (RSP) may display the following error message on the RSP console if the Versatile Interface Processor (VIP) is running at 99 percent capacity:
%ATM-3-FAILCREATEVC: ATM failed to create VC(VCD=23, VPI=0, VCI=96) on Interface ATM4/1/0, (Cause of the failure: Failed to have the driver to accept the VC)Conditions This symptom is observed on a Cisco 7500 series RSP that has a Cisco Versatile Interface Processor 2-50 (VIP2-50) and an enhanced ATM port adapter (PA-A3). The Cisco 7500 series is running Cisco IOS Release 12.0(12)S1 and has distributed Cisco Express Forwarding (dCEF) enabled.
Workaround Disable dCEF.
Alternate Workaround Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the ATM interface.
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The following errors may be logged on a Cisco 7206VXR router:
%ALIGN-3-CORRECT: Alignment correction made at 0x610D688C reading 0x2018DB0F
%ALIGN-3-TRACE: -Traceback= 610D688C 610D73B8 605F8FCC 601032B0 606A2A74 60108440 6010B238 60012858
%ALIGN-3-CORRECT: Alignment correction made at 0x610D688C reading 0x2017928F
%ALIGN-3-TRACE: -Traceback= 610D688C 610D73B8 605F8FCC 601032B0 606A2A74 60108440 6010B238 6001C17C
%ALIGN-3-CORRECT: Alignment correction made at 0x610D688C reading 0x2018DB0F
%ALIGN-3-TRACE: -Traceback= 610D688C 610D73B8 605F8FCC 601032B0 606A2A74 60108440 6010B238 6002E6E8The messages appear every few minutes. The alignment errors affect only packets with Service Advertisement Protocol (SAP) encapsulation. There is no workaround.
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Symptoms After the line protocol for the ATM-Circuit Emulation Services (CES) is enabled, the line protocol may become disabled and remain disabled.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(2.03).
Workaround There is no workaround.
IP Routing Protocols
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Symptoms A router may unexpectedly lose some routing entries and the neighboring routers that contain all the routing entries with successors even though it has a correct Enhanced Interior Gateway Routing Protocol (EIGRP) topology. The root cause appears to be a flapping Fiber Distributed Data Interface (FDDI) interface. This situation does not occur under normal operating conditions.
Conditions This symptom is observed on a Cisco router under rare circumstances.
Workaround Enter the clear ip eigrp neighbors [ip-address] EXEC command.
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Symptoms An (S,G) entry created by the receipt of data on an interface will have a NULL outgoing interface list (olist). Unless the X-flag is set for this entry, the entry expiration time will not be updated. The entry expiration time will time out and then be recreated by the next data packet. This symptom may increase the CPU usage on routers that process multicast packets for a large number of sources.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(8.06).
Workaround There is no workaround.
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A Cisco router that is running Enhanced Interior Gateway Routing Protocol (EIGRP) with the stub feature on might have a route that is active and not waiting for replies. This situation only occurs in networks where all of the EIGRP neighbors are declared as stub.
Workaround: Remove the EIGRP stub feature or clear the IP EIGRP neighbors.
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Symptoms This fix implements various optimizations implemented for Open Shortest Path First (OSPF), default external link-state advertisement (LSA), and Cisco Express Forwarding (CEF) in Cisco IOS Release 12.0 and Release 12.1. The fixes incorporated here originated from CSCdm83004, CSCdp72309, CSCdr26999, and CSCdr88511.
Conditions This fix implements various optimizations implemented for OSPF, default external LSA, and CEF in Cisco IOS Release 12.0 and Release 12.1.
Workaround There is no workaround.
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Symptoms When the internal Border Gateway Protocol (iBGP) is redistributed into an Interior Gateway Protocol (IGP) like the Routing Information Protocol (RIP) or the Open Shortest Path First (OSPF) Protocol, the routes show up as being advertised by OSPF and RIP. When the clear ip route privileged EXEC command is entered for an iBGP learned route, the route no longer appears in the OSPF and RIP database and is not advertised by either OSPF or RIP.
Conditions This symptom is observed when a iBGP learned route is cleared by entering the clear ip route privileged EXEC command on a Cisco router that is running Cisco IOS Release 12.1(2.03)E.
Workaround Enter either the clear ip bgp {* | address | peer-group name} [soft [in | out]] or the clear ip route {network [mask] | *} EXEC commands to clear this symptom.
Alternate Workaround Remove and reenter the neighbor statements in Border Gateway Protocol (BGP) or reload the router.
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A Cisco 6400 node route processor (NRP) may reload with the following error message:
%SYS-3-OVERRUN: Block overrun at 627E418 (red zone = 4E205047)This problem may occur when network address translation (NAT) is used. There is no workaround.
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Symptoms A router may not readvertise routes that are deemed as conditionally permitted by the neighbor address advertise-map route-map non-exist-map route-map router configuration command to the peer router.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1 E, 12.1 T, or Release 12.2 and that has Border Gateway Protocol (BGP) enabled.
Workaround There is no workaround.
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In a full mesh of route reflectors, one or two of the route reflectors may have a Border Gateway Protocol (BGP) table with multiple entries for the same route (there should be only one) with multiple tags. Clients of the route reflector still receive the correct BGP information. Virtual Private Network (VPN) routing/forwarding instance (VRF) interfaces on the route reflector may get an incorrect tag.
Workaround: Clear the BGP session. Clearing the route fixes the tag situation but not the BGP table.
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Symptoms A router may reload unexpectedly.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5) and that is using the Enhanced Interior Gateway Routing Protocol (EIGRP).
Workaround There is no workaround.
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Symptoms A router may reboot when all of the following conditions are present:
–
–
–
Conditions This symptom is observed on a Cisco router that is using RSVP on BRI interfaces and that is running Cisco IOS Release 12.1(5)T 12.2, or Release 12.2 T.
Workaround There is no workaround.
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Symptoms Multicast distributed switching does not work on ATM subinterfaces.
Conditions This symptom is observed on an ATM interface of a Cisco router that is running Cisco IOS Release 12.1(5.01)T and Release 12.2.
Workaround There is no workaround.
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Symptoms PPP over ATM (PPPoA) to Layer 2 Tunneling Protocol (L2TP) sessions are not stable with RADIUS on the L2TP network server (LNS) side because numerous IP static routes are configured while there are several ongoing sessions.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4)DC while static routes are looped. The processing on the PPP state machine slows to the point where sessions begin to time out and cause sessions to be unstable.
Workaround Configured a smaller number of IP static routes.
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Symptoms Network Address Translation (NAT) may fail to forward "ICMP Unreachable-fragmentation required" packets (ICMP type 3 code 4) when the packets are sent from the inside to the outside when NAT is configured with overload Port Address Translation (PAT).
Conditions This symptom is observed on a Cisco router that is using NAT and that is running Cisco IOS Release 12.1(10.1) and earlier releases, 12.1 T, 12.2(0.10) and earlier releases, or Release 12.2(0.07)T.
Workaround There is no workaround.
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A Cisco router may reload if you configure a static Rendezvous Point (RP).
Workaround: Use static route processing.
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A Cisco router that is running Resource Reservation Protocol (RSVP) over ATM may reload with a bus error in the Forwarding Information Base (FIB) switching code. There is no workaround.
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Symptoms The advertised network disappears and is no longer imported into the appropriate virtual routing and forwarding instance (VRF) by a provider edge (PE) router when a route reflector that provides the best path entry goes down and then comes back up again. Network connectivity is lost when this symptom occurs.
Conditions This symptom is observed in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) network that has two reflectors. A route reflector that provides the best path entry can go down and then come back up again when a network is advertised by one route reflector with the best path and fails and is subsequently replaced by the other route reflector.
Workaround Use the same cluster identity (ID).
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On a Cisco router or Catalyst switch, excessive Border Gateway Protocol (BGP) flapping may occur, if Multiprotocol Border Gateway Protocol (MBGP) is enabled and the extended attributes are larger than 255 bytes. There is no workaround.
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Symptoms When the Open Shortest Path First (OSPF) protocol is used between a provider edge (PE) and a customer edge (CE) router in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) environment, type-3 link-state advertisements (LSAs) can be generated at the PE as a result of the redistribution of the internal Border Gateway Protocol (iBGP) route. When the iBGP route goes down, the PE should flush previously generated type-3 LSAs. After the fix for CSCdr35422 is implemented, the PE may fail to flush type-3 LSAs.
Conditions This symptom is observed on a Cisco router that is running 12.1(5)T1 or Release 12.1(5.03)T.
Workaround There is no workaround.
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Symptoms A delay may occur when a receiver attempts to subscribe to a group.
Conditions This symptom is observed under rare circumstances in certain topologies on a Cisco router that is running Cisco IOS Release 12.0 and Release 12.1.
Workaround There is no workaround.
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Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) may send unnecessary updates for external or internal routes.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(6).
Workaround There is no workaround.
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Symptoms When malicious sources spam traffic to class D addresses, a large number of states may be created on multicast routers. These states can be propagated to other domains via the Multicast Source Discovery Protocol (MSDP).
The patch for this DDTS introduces the new ip msdp sa-limit {peer-name | peer-address} sa-limit global configuration command that allows a user to set a limit for the number of source actives (SAs) an MSDP speaker will accept from each of its peers.
SAs that are in excess of the set limit for the peer are discarded. A rate-limited (once a minute) syslog in the following form will inform the network administrator when SAs are discarded:
%MSDP-4-SA_LIMIT: SA from peer 172.12.0.1, RP 172.1.0.1 for (172.1.0.45, 234.1.1.1) exceeded sa-limit of 40
%MSDP-4-SA_LIMIT: SA from peer 172.23.0.3, RP 172.3.99.3 for (172.3.0.55, 234.1.1.3) exceeded sa-limit of 50The existing show ip msdp summary EXEC command and the show ip msdp count EXEC command have been enhanced to show the number of SAs that are learned from each peer.
Conditions This symptom is observed when malicious sources spam traffic to class D addresses.
Workaround There is no workaround.
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Under rare circumstances, an updated Border Gateway Protocol (BGP) bestpath may not be propagated to the BGP peers of a router.
Workaround: Enter the clear ip bgp * out EXEC command to updates the peers with the current bestpath attributes.
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Symptoms Subranges that are configured on a Network Address Translation (NAT) pool do not take effect.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2.
Workaround There is no workaround.
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Symptoms A router enters a continuous booting loop if more than more pool is defined by entering the ip nat inside source list global configuration command.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5)T1. This symptom is resolved in Cisco IOS Release 12.1 E.
Workaround To break the continuous booting loop, enter the ROM monitor (ROMmon) mode and boot the router using the boot loader image. Erase the configuration and reenter all the commands that were previously configured except the ip nat inside source list global configuration command.
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A Cisco 7200 series router that is running Cisco IOS Release 12.2(0.3) and that has Network Address Translation (NAT) configured may experience a software-forced reload when you enter the show ip nat translations EXEC command.
Workaround: Disable CEF and use other switching methods such as fast switching or process switching.
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Symptoms A software-forced reload may occur on a router.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(0.5) after Network Address Translation (NAT) is configured.
Workaround Configure the ip nat service skinny tcp port global configuration command on the router.
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Symptoms Static Network Address Translation (NAT) configuration lines cannot be removed through an HTTP user interface.
Conditions This symptom is observed on a Cisco router that has static NAT configuration lines.
Workaround Delete the static NAT configuration lines by connecting through a tty line.
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Symptoms After a router has booted up, Multicast Source Discovery Protocol (MSDP) peers that belong to a mesh group may have a sa-limit of 0. The Source-Active (SA) messages cannot be received or cached from the MSDP peers, and source discovery between the MSDP peers will not occur. This symptom is indicated in the following syslog message:
%MSDP-4-SA_LIMIT: SA from peer peer-addr RP rp-addr for (src-addr, group-addr) exceeded sa-limit of 0Conditions This symptom is observed on Cisco router that is running Cisco IOS Release 12.0(14.6)S3 or Release 12.0(15)S.
Workaround Limit the number of Source-Active (SA) messages from a Multicast Source Discovery Protocol (MSDP) peer that the router will allow in the SA cache by entering the ip msdp sa-limit {peer-name | peer-address} sa-limit global configuration command or enter the no ip msdp sa-limit {peer-name | peer-address} sa-limit global configuration command for each peer that belongs to a mesh group each time after a router reloads.
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Symptoms A Cisco 12000 series may reload because of a watchdog timeout and display a "FIB-2-FIBDOWN" message.
Conditions This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0(13.6)ST2 or Release 12.0(14)S1. This symptom is observed if a protocol such as the Intermediate System-to-Intermediate System (IS-IS) Protocol is entered as the protocol argument of the show ip route protocol EXEC command when there is a large number of routes in the routing table (about 100,000 routes).
Workaround Enter the show ip route EXEC command instead of the show ip route protocol EXEC command.
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Symptoms An incorrect metric may appear in the Enhanced Interior Gateway Routing Protocol (EIGRP) topology table for one or more routes after the metric value is changed on an interface.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4.4), 12.1(4)DC, 12.1(4)DC1, 12.1(4)DB, or a later release.
Workaround Clear all EIGRP neighbors that have provided the problematic routes using the clear ip eigrp neighbors [ip-address |interface] EXEC command. This command must be entered on the router that has the interface with the altered metric value.
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Symptoms The area border router (ABR) may fail to maxage type-3 link-state advertisements (LSAs) that are generated based on the inter-area route if the inter-area route is lost.
Conditions This symptom is observed after a router is reload or after the Open Shortest Path First (OSPF) process is cleared.
Workaround Clear the OSPF process.
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Symptoms A router may reload when a dot1q or Inter-Switch Link (ISL) subinterface that has multicast configured is deleted.
Conditions This symptom is observed on a Cisco router that has a dot1q or Inter-Switch Link when the following sequence of commands are entered:
Router(config)#interface gigabitEthernet5/0.1Router(config-subif)# encapsulation dot1Q 1
Router(config-subif)# ip address 10.10.10.2 255.255.255.0
Router(config-subif)# ip sdr listen
Router(config-subif)# ip pim sparse-dense-mode
Router(config-subif)# ^Z
Router# configure%SYS-5-CONFIG_I: Configured from console by consolet Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# no interface gigabitEthernet 5/0.1
Workaround Remove the following multicast commands from the subinterface before deleting the subinterface:
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface gigabitEthernet 5/0.1
Router(config-subif)# no ip sdr listen
Router(config-subif)# no ip pim sparse-dense-mode
Router(config-subif)# exit
Router(config)# no interface gigabitEthernet 5/0.1
% Not all config may be removed and may reappear after reactivating the sub-interface•
Symptoms When a route map or a filter list is added to an address family Virtual Private Network (VPN) neighbor, the configuration ends up under a global Border Gateway Protocol (BGP) configuration instead.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5)T1.
Workaround Disable the parser cache by entering the no parser cache global configuration command.
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Symptoms The set ip default next-hop ip-address [...ip-address] global configuration command command-line interface (CLI) prevents a user from configuring one of the interfaces on a router as the default next hop. This symptom prevents a user from conditionally setting itself as the next hop in routing updates and does not allow for backward compatibility.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1, 12.1 T, 12.2, or Release 12.2 T
Workaround There is no workaround.
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Symptoms When a router redistributes Enhanced Interior Gateway Routing Protocol (EIGRP) into Open Shortest Path First (OSPF) and when EIGRP has more than one successor, it is possible that a change in the feasible (EIGRP) successor does not generate the OSPF for the external link-state advertisement (LSA).
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5a).
Workaround Enter the clear ip ospf redistribution EXEC command to clear the OSP route redistribution.
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Symptoms A Border Gateway Protocol (BGP) filter list may incorrectly permit or deny a path.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(14)S.
Workaround Restart the BGP process.
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Symptoms A provider edge (PE) router does not put a network prefix in the Virtual Private Network (VPN) routing/forwarding (VRF) routing table when the prefix is received from a Route Reflector (RR) client.
Conditions This symptom is observed on a Cisco 7200 series and a Cisco 7500 series
Workaround There is no workaround.
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Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) may accept and attempt to install an external route that was redistributed locally. When this symptom occurs, routes in the routing table may be marked as "possibly down."
Conditions This symptom is observed if the route has an administrative distance that is worse than the external EIGRP routes. Such routes may include floating static routes that have an administrative distance that is greater than 170 and there are redundant paths in a network.
Workaround Apply an inbound distribute list in EIGRP to block the acceptance of the external EIGRP route.
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Symptoms A router that is running 600kbps of multicast video traffic into a Frame Relay interface and out of an ATM LAN Emulation (LANE) interface that has IP Protocol Independent Multicast (PIM) configurations reloads after approximately 18 hours because of a continuous memory leak. The PIM process in the ATM signaling switched virtual circuits (SVCs) holds increasing amounts of memory and does not release it. This situation occurs because no ATM address is configured on the interface. The incomplete configuration causes the memory leak.
Conditions This symptom is observed on a Cisco router that is running 600kbps of multicast video traffic into a Frame Relay interface and out of an ATM LAN Emulation (LANE) interface that has IP Protocol Independent Multicast (PIM) configurations.
Workaround Configure the IP address on the ATM LANE interface.
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Symptoms When a router is booted with Cisco IOS Release 12.1 using a configuration from Cisco IOS Release 12.0S that contains a peer group with network layer reachability information (NLRI), unicast, and multicast configured, the peer group members are not activated for address-family IPv4 multicast.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(05a)E06.
Workaround There is no workaround.
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Symptoms Open Shortest Path First (OSPF) summary redistribution may not function properly. After the clear ip ospf redistribution and the show ip ospf database external EXEC commands have been entered, the link-state age reaches a "MAXAGE" and does not come up again.
Conditions This symptom is observed only when a Cisco router is configured with the summary-address number command under OSPF and is also configured to have a static route that matches the same summary address.
Workaround There is no workaround.
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Symptoms Periods of high CPU utilization and a temporary console lock may occur on router that redistributes routes into the Open Shortest Path First (OSPF) Protocol of the routing table is large.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5a)E.
Workaround There is no workaround.
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Symptoms A software-forced reload may occur on a router.
Conditions This symptom is observed on a Cisco router when it receives and installs routes that have 25 different subnet masks within the same network into the routing table. The different masks within a network can be displayed by entering the show ip route EXEC command.
Workaround Filter routes that have subnet masks of 31 or 32 by using a prefix list to prevent those routes from being added to the routing table by limiting the number of possible distinct subnet masks to 24.
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Symptoms A software-forced reload may occur on a router and the following messages may be displayed on the console:
Aug 26 23:41:21.267: %SYS-2-NOBLOCK: suspend with blocking disabled.
-Process= "IP Input", ipl= 0, pid= 58
-Traceback= 601B5AAC 601A27C0 601A28E0 60548D7C 60546884 605463B0 6033CC44 6033BF30 6033C19C 6033C280 601903E4 601903D0
Unexpected exception, CPU signal 23, PC = 0x601AD338
$0 : 00000000, AT : 0000000F, v0 : 00000000, v1 : 000003E8
a0 : 0000000A, a1 : 003EF8E0, a2 : 00000000, a3 : 00064BB2
t0 : A0000000, t1 : 00000000, t2 : 0003EF4F, t3 : 40000000
t4 : 00000000, t5 : 0000001C, t6 : 00000400, t7 : 00000004
s0 : 00000000, s1 : 6371FB7C, s2 : 6864BD24, s3 : 63B7ECE4
s4 : 00000000, s5 : 00000000, s6 : 6371F924, s7 : 620C9240
t8 : 00006D7F, t9 : 00000000, k0 : 63BC0B1C, k1 : 601B51A0
gp : 61F03EE0, sp : 631C7180, s8 : 00080000, ra : 601AB95C
EPC : 601AD338, ErrorEPC : 042524C5, SREG : 3400BF03
Cause 00000024 (Code 0x9): Breakpoint exception
-Traceback= 601AD338 601AB95C 601A27D0 601A28E0 60548D7C 60546884 605463B0 6033CC44 6033BF30 6033C19C 6033C280 601903E4 601903D0Conditions This symptom is observed on a Cisco 10000 series that has Protocol-Independent Multicast (PIM) configured and that is running Cisco IOS Release 12.0 SL.
Workaround There is no workaround.
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Symptoms The exterior flag becomes unset on the route that is marked as default in the Enhanced Interior Gateway Routing Protocol (EIGRP).
Conditions This symptom is observed on a Catalyst 6000 Multilayer Switch Feature Card (MSFC) that is running Cisco IOS Release 12.1(04)E01.
Workaround Use a floating static default route.
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Symptoms Relearned information is not always consistent with other routers in the network when redundant Rendezvous Points (RPs) for the same group and when the RP mapping information that is generated through a Bootstrap Router (BSR) is manually cleared.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(6).
Workaround There is no workaround.
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Symptoms A router may reload after a watchdog timer expires and the following messages may be displayed on the console before the reload occurs:
*** Trace Exception ***
PC = 0x80653454, Vector = 0xd00, SP = 0x80f5e740
*** Data TLB Miss Exception ***
PC = 0xfff161bc, Vector = 0x1200, SP = 0x80f5e708
...
*** Watch Dog Timeout ***
PC = 0xfff161bc, SP = 0x80f5e380Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(0.3).
Workaround There is no workaround.
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Symptoms A Cisco 7000 series that has Open Shortest Path First (OSPF) configured may fail to install the default route. The default route will automatically be installed during the next Shortest Path First (SPF) process.
Conditions This symptom is observed on a Cisco 7000 series that is running Cisco IOS Release 12.1(7).
Workaround Add a static default route that has a higher administrative distance than OSPF and redistribute it through OSPF.
Alternate Workaround A Use one of the following commands:
(conf)#ip route 0.0.0.0 0.0.0.0 if-name 200
(conf)# router ospf 1
(router-conf)# default-information originate
(router-conf)# redistribute static subnetAlternate Workaround B Add a fake loopback to OSPF net statements and flap the default OSPF route.
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Symptoms The ip mroute-cache command cannot be configured on a router.
Conditions This symptom is observed on a number of platforms that support multicast fast switching. This symptom does not affect multicast distributed switching (MDS).
Workaround Configure MDS on the router if possible.
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Cisco Express Forwarding (CEF) may behave inconsistently with routing protocols that use holddown to protect against suboptimal routing. A route in holddown should be used to forward traffic until routing protocol timer expiration and/or convergence. CEF, however, removes the forwarding information from the Forwarding Information Base (FIB) immediately upon the route entering holddown. Process and fast switching will continue to forward traffic as expected. There is no workaround.
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The Open Shortest Path First (OSPF) database may not create the necessary entries to resubmit an OSPF interarea route.
Workaround: Clear the OSPF process.
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A Cisco router that is running Cisco IOS Release 12.0(13)S2 may reload because of a bus error when receiving a Border Gateway Protocol (BGP) update with an extended as_path length. There is no workaround.
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Symptoms A router may reload after the show ip igmp groups command is entered if the command is paused for a prolonged period of time at the "more" prompt and restarted later.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(16)S.
Workaround There is no workaround.
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A router that is running a Cisco IOS release that contains the fix for CSCdr33635 does not allow the user to configure secondary IP addresses on an interface that does not already have a primary IP address. The following are two possible scenarios and their respective workarounds.
Case 1: A user saves the running configuration that has an interface with both primary and secondary addresses with the copy running-config file EXEC command and subsequently removes all the addresses on that interface, thus changing the running configuration. If the user attempts to restore the original configuration with the copy saved-file running-configuration EXEC command, the secondary addresses will not be allowed to be configured. Any attempts to "cut and paste" the display of the output of the show running-configuration command will also cause the same problem.
Workaround for Case 1: Issue the copy saved-file running-configuration or perform the cut-and-paste twice.
Alternate workaround for Case 1: Configure the primary address manually before entering the copy saved-file running-configuration EXEC command to copy the saved configuration file into the running configuration file.
Case 2: This case applies to any virtual LAN (VLAN)-capable interface or subinterface that has a primary address and a secondary address. If the router is rebooted with an image that has the version with the earlier fix of CSCdr33635, the previous secondary addresses will not be allowed to be configured and will subsequently be lost on the interface or subinterface immediately after the router is reloaded.
Workaround for Case 2: Copy the startup configuration to running configuration after the reboot without entering the write memory command between the two operations. This action will restore the secondary address to the running configuration. This operation must be repeated on every reload.
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Symptoms When the Null0 interface is specified as the default output in local policy routing, the Route Switch Module (RSM) may fail to boot or reboots repeatedly.
Conditions This symptom is observed on the RSM of a Cisco router that is running Cisco IOS Release 12.1(7).
Workaround There is no workaround.
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Symptoms A router that has the ip multicast boundary access-list-number interface configuration command configured on an interface may reload when the access list is defined.
Conditions This symptom is observed on a Cisco 10720 that is running Cisco IOS Release 12.0(16.05)ST1
Workaround There is no workaround.
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Symptoms A software-forced reload may occur on a router and the following error message may be displayed:
%SYS-3-BADBLOCK: Bad block pointer %SYS-6-BLKINFO: Freespace does not end at end of the pool blkConditions This symptom is observed on a Cisco router that is running the Open Shortest Path First (OSPF) Protocol as the routing protocol. This symptom occurs only if the router receives a corrupted link-state advertisement (LSA).
Workaround There is no workaround.
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Symptoms If there are multiple traffic engineering (TE) tunnels that start from the same router (router A) and ends on the different routers that are all on the shortest path from router A to the router that advertises the multicast source (source S), Reverse-Path Forwarding (RPF) checks will fail on router A and all multicast traffic from source S will be dropped on router A.
Conditions This symptom is observed when Protocol-Independent Multicast (PIM) is used over a Multiprotocol Label Switching (MPLS) and TE network when there is a tunnel to the router that is advertising the source network.
Workaround There is no workaround.
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The ip pim nbma-mode interface configuration command may not work correctly when it is used in a hub and spoke network configuration. In a hub and spoke configuration, a hub router has connections to all spoke routers, but the spoke routers are not connected among themselves. The spoke routers are joined to multicast traffic through the nonbroadcast multiaccess (NBMA) interface of the hub router even if the traffic path goes across to another spoke router. The hub router forwards traffic received on the NBMA interface out to all spoke routers on the NBMA interface.
This function does not work correctly in IP multicast process switching (on all platforms) and in IP multicast distributed switching (MDS) on a Cisco 7500 series router with Versatile Interface Processor (VIP) line cards. This problem was observed in a network with Frame Relay interfaces that are configured with the ip pim nbma-mode interface configuration command but is not limited to Frame Relay interfaces.
Workaround: Configure IP multicast fast switching (but not distributed switching) on the affected interfaces.
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Under unusual timing circumstances, the Enhanced Interior Gateway Routing Protocol (EIGRP) may issue an error message stating "Spurious Memory Access" if the next hop to a route disappears while an update is queued to be sent to a neighbor. There is no workaround.
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A Cisco 7200 Network Services Engine (NSE-1) that is running Cisco IOS Release 12.1(7)E may experience a software-forced reload after a static entry is configured on top of a dynamic network address translation (NAT). There is no workaround.
ISO CLNS
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Symptoms A Cisco 12000 series may reload because of a bus error.
Conditions This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0(14)S.
Workaround There is no workaround.
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Symptoms On two routers that have two peer-to-peer parallel adjacencies between them, a new link-state packet (LSP) is not created when the link with the lowest metric goes down. This symptom may cause a loss of connectivity between the two routers.
Conditions This symptom is observed on two Cisco routers that are running Cisco IOS Release 12.1(7).
Workaround Force an LSP generation by entering the clear clns * EXEC command or the clear isis * EXEC command.
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Symptoms If a Layer 2-only interface goes down on a router that is running the Intermediate System-to-Intermediate System (IS-IS) protocol and if that router is using route leakage to redistribute the network on that interface into Layer 1, the network may not be removed from the Layer 1 link-state packet (LSP) on that router.
Conditions This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0(14)S.
Workaround Enter the clear ip route {*} EXEC command. The LSP should be properly regenerated.
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Symptoms A router may reload when Intermediate System-to-Intermediate System (IS-IS) is enabled.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(0.21)T, 12.1(8)E, or Release 12.1(8.05)E2.
Workaround There is no workaround.
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Symptoms A router that resides on a network with Intermediate System-to-Intermediate System (IS-IS) and Open Shortest Path First (OSPF) running concurrently with default administrative distances configured may reload when the clear ip route * EXEC command or the router ospf process-id global configuration command is entered and when a subnet prefix is shared by both IS-IS and OSPF.
Conditions This symptom is observed on a Cisco router that resides on a network that has Intermediate System-to- Intermediate System (IS-IS) and Open Shortest Path First (OSPF) running concurrently with default administrative distances configured.
Workaround Change the administrative distance under the router isis [tag] global configuration command.
Miscellaneous
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Symptoms When a crashinfo buffer is created, all commands that are entered before a reload are saved and stored in the buffer. Rivest, Shamir, and Adleman (RSA) or Digital Signature Standard (DSS) keys that are meant to be stored in NVRAM may be displayed in the crashinfo buffer.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0.
Workaround There is no workaround.
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Symptoms An OC48 Packet over SONET (POS) line card may reload after a series of "%FIB-3-FIBSEQ: Out of sequence" messages such as the following are displayed:
%FIB-3-FIBSEQ: Out of sequence. State 1391 Rcvd 1395Conditions This symptom is observed on an OC48 POS line card of a Cisco 12000 series that is running Cisco IOS Release 12.0(3.02)S
Workaround Upgrade to Cisco IOS Release 12.0(14.1)S or Release 12.0(13.6)S02. When this symptom occurs, reload the microcode on the line card.
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Symptoms An enhanced ATM port adapter (PA-A3) may report a higher than expected number of cyclic redundancy check (CRC) errors on an ATM interface for one or more virtual circuits (VCs). The root cause of the problem is that the affected versions of Cisco IOS are counting packet bytes which were received with CRC errors, rather than counting packets with errors. This condition makes the CRC error counter many more times higher than the actual value. The same behavior is also observed with abort and giant errors.
Conditions This symptom is observed on a PA-A3 port adapter of a Cisco router that is running Cisco IOS Release 12.0(5.02)T1.
Workaround Troubleshoot the cause of the CRC errors.
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Symptoms A Cisco uBR924 router may lose a H.323 configuration when it is reloaded after it has been configured to use an H.323 gatekeeper to place phone calls. The following three lines were added to the configuration of the cable interface on the Cisco uBR924:
h323-gateway voip interface
h323-gateway voip id gklocal ipaddr 6.3.0.2 1719
h323-gateway voip h323-id sample@cisco.comAfter the router is rebooted, the commands may not be processed correctly because the commands are applied to the interface before the interface acquires an IP address from Dynamic Host Configuration Protocol (DHCP).
Conditions This symptom is observed on a Cisco uBR924.
Workaround Reenter the missing configuration.
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Symptoms A Cisco multichannel T1/E1 port adapter does not support the switching of Multiprotocol Label Switching (MPLS) packets.
Conditions This symptom is observed on a Cisco multichannel T1/E1 port adapter of a Cisco router.
Workaround There is no workaround.
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Symptoms When an Integrated Services Adapter (ISA) card is reloaded from a software engine to a hardware engine, the connection identity (ID) that was used in the software engine before conflicts with the connection ID number that is newly created by the hardware engine.
Conditions This symptom is observed on an ISA card of a Cisco router that is running Cisco IOS Release 12.0(9).
Workaround Do not reload the card with a hardware engine. Create several IP Security (IPSec) security associations (SAs), delete the IPSec SA session that has a connection ID value of "1", and reload the engine.
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Symptoms The Enhanced Availability Drop and Insert (EADI) feature may cause packets to be lost a digital voice network module for the Cisco 3600 series when the digital voice network module is reloaded. Although the impact on voice is negligible, the controller may record 2-3 seconds of slips when the reload occurs.
Conditions This symptom is observed on a digital voice network module of a Cisco 3600 series.
Workaround There is no workaround.
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Symptoms Interoperability issues may be observed when Context-based Access Control (CBAC) is used with Web Cache Communication Protocol (WCCP).
Conditions This symptom is observed when CBAC is used with Web Cache Communication Protocol (WCCP) and Network Address Translation (NAT). Under these conditions, do not disable inspection in the fast path by entering the no ip inspect fast interface configuration command as there is an interoperabilty issue. The default action is on.
Workaround There is no workaround.
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When a single T1 or E1 link in an Inverse Multiplexing over ATM (IMA) environment has surpassed the differential delay limit on a Cisco 3600 series router, the other "good" T1 or E1 links may become deactivated and the IMA group will run on the single T1 or E1 link with the excess delay. The expected behavior is that the "bad" T1 or E1 link with the added delay would be deactivated and the three "good" T1 or E1 links would remain operational. The problem affects only the T1 and E1 links. There is no workaround.
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Symptoms The cable modem on a router may reload when access list numbers 100 or 101 are configured.
Conditions This symptom is observed on a Cisco uBR900 series that is running Cisco IOS Release 12.1(2)T or Release 12.2.
Workaround Use access list numbers other than 100 or 101.
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Symptoms Peer discover fails when the qm_timer expires.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(2).
Workaround There is no workaround.
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Symptoms A Cisco 7500 series may not recognize a Versatile Interface Processor 4 (VIP4).
Conditions This symptom is observed on a Cisco 7500 series that has an Inverse Multiplexing over ATM (IMA) port adapter.
Workaround There is no workaround.
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Symptoms Reception issues may be observed on a Gigabit Ethernet Interface Processor (GEIP) and the GEIP may pause indefinitely.
Conditions This symptom is observed on the GEIP of a Cisco 7500 series that has distributed Cisco Express Forwarding (dCEF) enabled.
Workaround Disable dCEF on the GEIP interface.
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Symptoms A Cisco AS5300 that is used to terminate ISDN calls may reload with a bus error at the acc_search_type process.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.0(7)T.
Workaround There is no workaround.
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Symptoms A segmentation violation (SegV) exception may occur when the docsDevNmAccessControl object is set to "1".
Conditions This symptom is observed on a Cisco uBR900 router that is running Cisco IOS Release 12.1(3)T.
Workaround There is no workaround.
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Symptoms An authentication, authorization, and accounting (AAA) accounting start record does not include Route Processor Module (RPM) attributes for asynchronous calls.
Conditions This symptom is observed on a Cisco AS5800 that is running Cisco IOS Release 12.0(8.02)T.
Workaround There is no workaround.
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Symptoms Digital Signature Standard (DSS) keys generated on a router that is running Cisco IOS Release 12.0(11) cannot be used or exchanged on a router that is running Cisco IOS Release 12.1(2).
Conditions This symptom is observed on a Cisco router when it is upgraded from Cisco IOS Release 12.0(11) to Release 12.1(2).
Workaround There is no workaround.
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Symptoms A Cisco 3640 may fail to make outgoing ISDN calls after working correctly for some time. The following message indicates the cause of this symptom:
BRI0/0: In state F7, Received code Power-up BRI0/0 : Unexpected indication (1C) in f7 codeConditions This symptom is observed on a Cisco 3640 router that is running Cisco IOS Release 12.0(7)XK1 or 12.1(2)T and that has 2 10/100 Ethernet 2-WAN-card-slot network module (NM-2FE2W) and a 1-port ISDN BRI (S/T) WAN Interface Card (WIC-1B-S/T)
Workaround Reload the router.
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Symptoms When H.235 security is configured on a gateway, it generates and includes an H.235 crypto token in the request messages that are sent to the gatekeeper. This process allows the gatekeeper to authenticate the gateway. However, when the gateway is generating a crypto token, it inadvertently frees the wrong memory and reloads.
Conditions This symptom is observed on a Cisco router that is used as a gateway and that is running Cisco IOS Release 12.1(5)XM.
Workaround Do not enable security on the gateway.
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Symptoms When a create Packet Data Protocol (PDP) request is sent to a Cisco Gateway GPRS Support Node (GGSN), the MSISDN header field is incorrectly parsed.
Conditions This symptom is observed on a Cisco Gateway GPRS Support Node (GGSN).
Workaround There is no workaround.
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Symptoms A router may reload because of a bus error at PC 0x60352FFC(pot1e1_safe_start), address 0x0.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(8.02).
Workaround There is no workaround.
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Symptoms When port 1 of a digital voice port adapter (PA-VXB or PA-VXC) is configured for ISDN or Q-signaling (QSIG), the D-channel may go down under stress conditions and many not recover.
Conditions This symptom is observed on a Cisco router that has a PA-VXB or a PA-VXC port adapter that is configured for ISDN or QSIG.
Workaround Add a 2-port MIX multichannel T1/E1 port adapter with CSU/DSU (PA-MCX-2TE1) and configure ISDN on the PA-MCX-2TE1 ports.
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Some channels of a digital voice port lock up in the EM_PARK state after a period of normal operation. The output of the show voice call [summary] privileged EXEC command shows that the channel is in the EM_PARK state. The output of the show voice port [summary] privileged EXEC command shows that the channel operation status is up while in_status and out_status are in idle.
Workaround: Reload the system.
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Symptoms A Cisco AS5300 may accept a Token Ring that should be rejected.
Conditions This symptom is observed on a Cisco AS5300 when it is used with a digital customer loop (DCL) Open Settlements Protocol (OSP) server.
Workaround There is no workaround.
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Symptoms An agent-set control unit (ASCU) gateway may not come up because of T1 timeouts when running the Airline Line Control (ALC) protocol.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(2)T. This symptom does not occur when Cisco IOS Release 12.0(5)T is used.
Workaround There is no workaround.
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Symptoms IP packets intermittently fail to pass through a Cisco 4700 series router if you add source-bridge spanning to the Token Ring interface to allow single route explorers (SREs) to be passed into the router in situations where you need to bridge IP with and without Routing Information Field (RIF) and need to pass Systems Network Architecture (SNA) traffic between a Token Ring and Ethernet.
Conditions This symptom is observed on a Cisco 4700 series router that is running Cisco IOS Release 12.1(3). This symptom does not affect the Cisco 3620 router.
Workaround There is no workaround.
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Symptoms A router may fail to route all packages after the crypto map interface configuration command is configured in the required amount of time.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(3.03)T or Release 12.2.
Workaround There is no workaround.
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Symptoms It may not be possible to use autoinstall on a Cisco 2500 series over a Frame Relay network. The configuration cannot be downloaded from a TFTP server.
Conditions This symptom is observed on a Cisco 2500 series that is running Cisco IOS Release 12.1 T, 12.2, or Release 12.2 T.
Workaround Users may use autoinstall over High-Level Data Link Control (HDLC) instead of frame relay encapsulation.
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A Cisco 7500 series router provisioned as a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) Provider Edge (PE) router and connected to Customer Edge (CE) routers through Virtual Interface Processor (VIP) interfaces may experience a VIP reload while the router is performing distributed Cisco Express Forwarding (dCEF) under the following (transient) conditions:
–
–
Workaround: Do not use the no tag-switching ip global configuration command while passing traffic through the router.
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Symptoms Cisco IOS Software allocates calls to modems that are in the disconnecting state when it fails to find a free modem. Cisco IOS Software sends a terminate signal to a modem and after two seconds assumes that the modem is back to idle even if it does not receive an idle signal from the modem. This assumption is incorrect for modems taking longer to terminate, and for modems that have failed. This situation results in a RingNoAnswer (RNA) condition and a lower call success rate (CSR).
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.0, 12.1 T, and Release 12.2.
Workaround There is no workaround.
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Symptoms A memory leak may occur on a Cisco 6400 series during the PPP authentication process. The memory leak is most noticeable when the Cisco 6400 series is terminating a large number of PPP sessions and there is a high level of PPP authentication processing.
Conditions This symptom is observed on a Cisco 6400 series that is running Cisco IOS Release 12.1(1)DC1 or 12.1(3)DC1when the Cisco 6400 series is terminating a large number of PPP sessions or when there is a high level of PPP authentication processing.
Workaround There is no workaround.
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Symptoms When a Cisco 6400 acts as a tag switching edge router, it may stop running the Tag Distribution Protocol (TDP) after a reboot. A neighboring Cisco router may also fail to recognize the Cisco 6400 as a TDP neighbor after the reboot occurs and forwarding equivalence classes (FECs) that are sent through the Cisco 6400 are marked as untagged.
Conditions This symptom is observed on a Cisco 6400 that is used as a provider edge (PE) router. The Cisco 6400 is connected to a Node Route Processor (NRP) on a Cisco router through an Ethernet interface on the Cisco 6400.
Workaround Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the Ethernet interface of the Cisco 6400. If the procedure of shutting down and bringing the Ethernet interface back up again does not work, reboot the Cisco 6400.
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Symptoms CPU utilization on a Cisco AS5300 may increase by 35 percent even when no users are dialed into the system.
Conditions This symptom is observed on a Cisco AS5300 access server that is running Cisco IOS Release 12.1(2a) and that has an 8-port T1/PRI port adapter.
Workaround There is no workaround.
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Symptoms The following output may be displayed on the console port on a router:
%SYS-3-CPUHOG: Task ran for 49272 msec (0/0), process = Auto Config insertion process, PC = 602AFF20Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4)DC when the router is booted with an image that has a configuration with a large number of subinterfaces. This symptom does not affect the normal operation of the router.
Workaround There is no workaround.
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Symptoms A Cisco 7500 series that has a Spatial Reuse Protocol (SRP) interface and that is running distributed Cisco Express Forwarding (dCEF) may not correctly process the Access Control Lists (ACLs) that are applied to the SRP interface.
Conditions This symptom is observed on a Cisco 7500 series that has a SRP interface and that is running dCEF. This symptom is observed with Cisco IOS Release 12.0(12)S.
Workaround Disable dCEF on the SRP interface by entering the no ip route-cache distributed interface configuration command or run centralized CEF by entering the ip cef global configuration command.
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Modular quality of service (QoS) command line interface (CLI) allows router to set IP precedence on matching outbound Multiprotocol Label Switching (MPLS) packets, which corrupts the outbound packets. There is no workaround.
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IP precedence is not set on multicast packets using input Committed Access Rate (CAR) with an access list. This situation does not exist if Cisco Express Forwarding (CEF) is turned off on an interface that is configured with the rate-limit interface configuration command. Unicast packets work correctly with CEF and precedence set. There is no workaround.
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Symptoms The digital signal processor (DSP) on a Cisco ICS7700 multiservice route processor (MRP) may stop responding and display the following message if the Cisco ICS7700 is oversubscribed with fax calls:
ASSERTION FAILED: file "../src-m860-les/if_ipm_c54x_idma.c", line 537
%SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=8109E46C, count=0
%IPM_C54X-3-HOST_XMIT_BLOCKED: Host is unable to transmit packets to DSP 1No further calls can go through the Cisco ICS7700 after this symptom occurs.
Conditions This symptom may occur if 24 calls are sent continuously to the Cisco ICS7700 while the Cisco ICS700 has only one packet voice and data module (PVDM-20) that can handle 15 fax calls.
Workaround Reload the Cisco ICS7700.
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Symptoms More than 40 percent of voice calls may fail to connect after 240 calls have been placed. An invalid automatic number identification (ANI) is seen in the logs of the debug aaa EXEC command.
Conditions This symptom occurs when channel-associated signaling (CAS) Feature Group B (FGB) authentication, authorization, and accounting (AAA) is in use and the answer-address dial peer configuration command is entered on the plain old telephone service (POTS) dial peer for the ANI.
Workaround There is no workaround.
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Symptoms A router may refuse to negotiate any cryptomap template other than the first cryptomap template. Multiple dynamic cryptomap templates that are within the same dynamic cryptomap template set do not work.
Conditions This symptom is observed on a Cisco router when multiple dynamic cryptomap templates are used.
Workaround Specify each template with a separate name and add each template to the cryptomap individually. For example, instead of specifying:
crypto dynamic-map label 10
set transform-set proposal1
match address 101
crypto dynamic-map label 20
set transform-set proposal1
match address 102
!specify:
crypto dynamic-map label1 10
set transform-set proposal1
match address 101
crypto dynamic-map label2 10
set transform-set proposal1
match address 102
!
crypto map to-london 10 ipsec-isakmp dynamic label1
crypto map to-london 20 ipsec-isakmp dynamic label2•
Symptoms A Cisco Express Forwarding (CEF) for a directly connected route and host on a directly connected interface may point to an incorrect next hop. The following is the route entry and CEF entry for 192.168.0.10:
Router #show ip route 192.168.0.10
Routing entry for 192.168.0.8/30
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via ospf 1
Advertised by ospf 1 subnets
Routing Descriptor Blocks:
* directly connected, via Serial8/0/0
Route metric is 0, traffic share count is 1
Router #show ip cef 192.168.0.10
0.0.0.0/0, version 19, cached adjacency 192.168.0.4
0 packets, 0 bytes
via 192.168.0.4, 0 dependencies, recursive
next hop 192.168.0.4, Vlan215 via 192.168.0.4/32
valid cached adjacencyThe CEF entry points to an IP address that has been configured as the default gateway.
Conditions This symptom is observed in a network that has two Cisco routers: Router A (192.168.0.9.30) and router B (192.168.0.10/30). Both of the routers are running either Cisco IOS Release 12.1(2)E or Release 12.2.
Workaround Disable CEF by entering the no ip route-cache cef global configuration command on each interface.
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Symptoms Very low throughput may be observed on a Cisco 1700 series when IP Security (IPSec) is used with generic routing encapsulation (GRE) on a hardware encryption card. The throughput that is observed is significantly lower than when direct IPSec is used. Packets may also be process-switched instead of being fast-switched.
Conditions This symptom is observed on a Cisco 1700 series when IPSec is used with GRE on a hardware encryption card.
Workaround There is no workaround.
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Symptoms After IP Cisco Express Forwarding (CEF) is enabled on a Route Switch Module (RSM) and the RSM is reloaded, the interfaces show that the no ip route-cache cef interface configuration command is enabled. This symptom causes the CPU to run at 99 percent.
Conditions This symptom is observed on a Cisco RSM that is running Cisco IOS Release 12.0(5)T1.
Workaround Manually change the configuration.
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The slot 1 analog voice interface card (VIC) ports (Foreign Exchange Office (FXO), recEive and transMit (E&M), etc.) of a Cisco ICS7750 Multiservice Route Processor (MRP) becomes unusable after you use the show diag EXEC command. This situation occurs when the VIC uses the packet voice digital signal processor (DSP) module (PVDM) in a PVDM slot1 (the second PVDM slot). This situation also occurs in the upper 8 ports of a 16-port Foreign Exchange Station (FXS) card.
Workaround: Use the PVDM in slot 0 for a 2-port analog VIC. For example, if two 2-port FXO cards are on the MRP, plug in a PVDM-8 or a higher PVDM (PVDM with 2 or more DSPs) into slot 0. There are no known problems caused by using the show diag EXEC command for this configuration. Reboot the MRP for a 16-port FXS card.
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Symptoms When an operation, administration, and maintenance (OAM) F5 end to end cell is received over permanent virtual circuit (PVC) configured for data (normal operation), the Segmentation and Reassembly (SAR) component returns the same buffer descriptor twice; one on OAM status queue, the other on the data status queue of the corresponding PVC. Early packet discard (EPD) and UNDF are reported for such descriptors.
Conditions This symptom is observed on a Cisco 3600 that is running Cisco IOS Release 12.1(4.02)T or Release 12.2.
Workaround There is no workaround.
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Symptoms Class-Based Weighted Fair Queueing (CBWFQ) may not correctly classify Multiprotocol Label Switching (MPLS) packets that are transmitted into an MPLS Traffic Engineering (TE) tunnel interface.
Conditions This symptom is observed on a Cisco router that has an MPLS TE tunnel interface and that is running Cisco IOS Release 12.0(11)ST, 12.1(5)T, or Release 12.2.
Workaround There is no workaround.
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A Cisco AS5300 series universal access server that is acting as a voice gateway reloads with a bus error at PC 0x60C0C384, address 0x20. There is no workaround.
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Symptoms The state of a file can be altered by a write, a delete, or a rename operation at the same time when it is opened for a read operation; however, a simultaneous write, delete, or rename operation cannot be performed on a file while the file is opened for a write operation.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4)DB, 12.1, 12.2, or Release 12.0 S.
Workaround There is no workaround.
Any operation that can possibly change the state of a file like writing, deletion, renaming can be performed on a file simultaneously when it is open for a read but not when it is open for a write.
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Symptoms A Cisco Route Switch Module (RSM) may reload because of a bus error exception.
Conditions This symptom is observed on a Cisco RSM that is running Cisco IOS Release 12.1(2) and that is configured for triggered Routing Information Protocol (RIP).
Workaround There is no workaround.
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Symptoms An encapsulation change on a permanent virtual circuit (PVC) is not reflected in the output of the show atm vc EXEC command.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(2.03).
Workaround There is no workaround.
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Symptoms Voice support on a Versatile Interface Processor 4 (VIP4) may cause a Cisco 7500 series to reload.
Conditions This symptom is observed on a Cisco 7500 series that has a VIP4 and that is running Cisco IOS Release 12.2(1). This symptom is observed after 5-6 hours of stress testing.
Workaround There is no workaround.
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Symptoms If a static IP route is configured to point to a multilink group interface, IP traffic does not route through that interface and the following configuration does not work:
ip route x.x.x.x y.y.y.y multilink1Conditions This symptom is observed on the multilink group interface of a Cisco 7500 series that is running Cisco IOS Release 12.0 S.
Workaround Use a static route that points to the next-hop address. For example:
ip route x.x.x.x y.y.y.y z.z.z.z"z.z.z.z" is the IP address of the peer router.
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Symptoms An "IPC SLAVE LOG" message may appear when a Cisco 7500 image is loaded on a Cisco 7500 series.
Conditions This symptom is observed on a Cisco 7500 series that has a 2-port T1, E1, high capacity, enhanced digital voice port adapter (PA-VXC-2TE1+), a 2-port T1, E1 enhanced digital voice port adapter (PA-VXB-2TE1+), or a one-port enhanced digital voice port adapter (PA-VXA-1TE1-24+ or PA-VXA-1TE1-30+).
Workaround There is no workaround.
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Symptoms When a Fast Ethernet interface on a Cisco 1700 series is shut down (down/down), the link-down keepalives traps continue to sent every ten seconds.
Conditions This symptom is observed on a Cisco 1700 series that has a Fast Ethernet interface and that is running Cisco IOS Release 12.1(2).
Workaround Enter the no keepalive interface configuration command or the no snmp trap link-status interface configuration command.
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Symptoms For ISDN data calls, when a PRI group is configured Cisco IOS software assigns a High-Level Data Link Control (HDLC) channel for each time slot.
For ISDN voice calls that are in a PRI group, the time slots do not need a HDLC channel. However, Cisco IOS software assigns HDLC channels for each time slot as soon as a PRI group is created regardless of whether the time slots are used for data or voice calls.
Conditions This symptom is observed on a Cisco router that has an 8-port MIX multichannel T1/E1 port adapter that has CSU/DSU (PA-MCX-8TE1) HDLC controller. This symptom does not occur if a ds0 group is created for voice calls.
Workaround There is no workaround.
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Symptoms A router that is functioning as a Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) headend router may reload when tunnels come up.
Conditions This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0(11)ST. The reload usually occurs under stress conditions (for example when there are 500 tunnels coming up in a short time span). The reload occurs only when prefixes that were routed over physical links and transitioned to being routed over tunnels. There will be an intermediate state whereby a prefix can be loadshared over multiple links (such as tunnel links or physical links).
Workaround There is no workaround.
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Symptoms The digital signal processor (DSP) may timeout if an 8, 4, or 2-port single-wide port adapter card is removed and the router may reload if the port adapter card is reinserted. This symptom is observed while voice traffic is present.
Conditions This symptom is observed on a Cisco router that has an 8, 4, or 2-port single-wide port adapter card while voice traffic is present.
Workaround If a user wants to perform an online insertion and removal (OIR) on an 8, 4, or 2-port single-wide port adapter card during a call, the user has to shut down the port to clear the call before the card can be removed.
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Symptoms A DISCONNECT message may not be forwarded across a plain old telephone service (POTS) call leg. When an E1 Q Signaling (QSIG) controller is out of service, and a Cisco router receives an incoming call from a PBX, the controller does not send a DISCONNECT message to the PBX. Instead, the PBX initiates a DISCONECT message after 20 seconds with a "recovery on timer expiry" cause message. If the signaling connection is not successfully set up, H.323 does not initiate disconnect procedures. If the H.323 terminating gateway is unreachable, then a DISCONNECT message is returned with a "service or option unavailable" cause message after the H.225 connection timer expires. The cause message may prevent a PBX from rerouting the call.
Conditions This symptom is observed on a Cisco 3600 series that is running Cisco IOS Release 12.1(3a)XI02
Workaround There is no workaround.
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Symptoms A MIX-Multichannel port adapter (PA-MCX) on a Cisco 7200 series may display the following message:
00:05:32: %VTSP-3-DSP_TIMEOUT: DSP timeout on event 6: DSP ID=0x1: DSP error stats, chnl info(5, 12, 0)Conditions This symptom is observed on a Cisco 7200 series that has a PA-MCX and that has T1 channel-associated signaling (CAS) Voice over IP (VoIP) configured when eight T1 channels are stress tested for about two hours.
Workaround There is no workaround.
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A Cisco voice gateway that is using a channel-associated signaling (CAS) interface and Tool Command Language (TCL) Interactive Voice Response (IVR) 2.0 application may leak memory that causes a Cisco router to reload. There is no workaround.
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Symptoms When packets are forwarded over a generic routing encapsulation (GRE) tunnel with Cisco Express Forwarding (CEF) and NetFlow enabled, NetFlow egress records are not created. This behavior does not match normal fast switching behavior.
Conditions This symptom is observed on a Cisco 7200 series that is running Cisco IOS Release 12.1.
Workaround There is no workaround.
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Symptoms On a Cisco 7200 series Response Time Reporter (RTR) that has an Inter-Switch Link (ISL) trunk to a Token Ring/software network that is configured with several subinterfaces for different IP subnets, stations on one subnet may fail to send a ping to stations on the other subnet through the Cisco 7200 series RTR when the packet size ranges from 4036 to 4043 bytes and IP process switching is enabled on the TR-ISL interfaces.
Conditions This symptom is observed on a Cisco 7200 series RTR that has an ISL trunk to a Token Ring/software network that is configured with several subinterfaces for different IP subnets.
Workaround Disable IP process switching on the TR-ISL interfaces by entering the ip route-cache interface configuration command. Use IP fast switching instead.
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Symptoms If traffic congestion occurs on an ATM interface, the subsequent packet that belongs to a new virtual circuit (VC) that does not have an entry in the tx_ring or txc_ring is held in the "hold_pak forever" state and not get rescheduled. This symptom causes a wedge on the output queue.
Conditions This symptom is observed on the ATM interface of a Cisco router.
Workaround Enter the shutdown interface command followed by the no shutdown interface configuration command to clear the queue temporarily.
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Symptoms About 0.25 percent of call detail records (CDRs) have a disconnect cause code of 0x11 (busy) that have a non-zero call duration.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.1(4.04)T2 or Release 12.2.
Workaround There is no workaround.
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Symptoms A Cisco 4500 series may lose IP connectivity to other servers within a Token Ring.
Conditions This symptom is observed on a Cisco 4500 series when the router is upgraded from Cisco IOS Release 11.7 to Release 12.0(11).
Workaround Ensure that the LAN Network Manager (LNM) is turned off.
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Symptoms When modem recovery action is disabled, modems are still downloaded regardless of the state of the recovery configuration. The recovery mechanism may consider the recovery configuration when call failures exceeds the configured threshold.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.0(6).
Workaround There is no workaround.
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Symptoms When an automated test configures a recEive and transMit (E&M) port with certain nondefault configurations, the port fails for all other tests until the router is reloaded again. This situation does not occur when the test is run manually.
Conditions This symptom is observed on a Cisco 1700 series that is running Cisco IOS Release 12.1.
Workaround There is no workaround.
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Symptoms Policy routing does not work when Cisco Express Forwarding (CEF) is enabled and when there is a route in the routing table for the packet destination IP address. Policy routing is not applied when there is a default route in the routing table. The policy route-map must be applied on an ATM interface.
Conditions This symptom is observed on a Cisco 1700 series that is running Cisco IOS Release 12.1.
Workaround Disable CEF.
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Symptoms A router may reload when an attempt is made to pass some Supplemental Q Signaling (QSIG) services.
Conditions This symptom is observed on a Cisco AS5300.
Workaround There is no workaround.
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Symptoms SUSPEND and RESUME messages are not generated on the incoming leg of a call.
Conditions This symptom is observed in a network in which subscriber A is on the AXE side and subscriber B is on the public switched telephone network (PSTN). When subscriber A calls subscriber B, AXE sends the call to the Cisco AS5300 and Cisco SC2200 signaling controller which then switches the call in Voice over IP (VoIP) and sends it to the PSTN. When subscriber B hangs the call for a moment, a SUSPEND message is sent from the PSTN to the Cisco SC2200. However, the Cisco SC2200 does not send the SUSPEND message to the AXE.
There is a Q.931 message call SUSPEND on the outgoing gateway from the Cisco SC2200 that is sent to the incoming gateway. The incoming gateway receives this message as a STATUS message and responds by sending a MESSAGE TYPE NOT SUPPORTED message to the outgoing gateway.
However, the call is not cleared and subscriber B receives the call again. A RESUME message is then sent from the PSTN to the Cisco SC2200. The Cisco SC2200 does not send the RESUME message to the AXE. On the outgoing gateway, there is a Q.931 message call RESUME from the Cisco SC2200 that is sent to the incoming gateway. The incoming gateway receives this message as a status message and responds by sending a MESSAGE TYPE NOT SUPPORTED message to the outgoing gateway. However, the call is still active until the RELEASE message is received.
Workaround There is no workaround.
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Symptoms Number translation does not work on a directory gatekeeper (DGK) location request (LRQ) forwarding is used.
Conditions This symptom is observed on a H.323 gatekeeper that is running Cisco IOS Release 12.2(1)T.
Workaround There is no workaround.
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Symptoms An interface that receives mobile IP registration requests goes into the throttle mode when authentication, authorization, and accounting (AAA) server response slows down.
Conditions This situation is observed when there are more registrations coming in than the number of registration replies that Home Agent (HA) can send (exceeding the input buffer of the interface).
Workaround Use traffic shaping to reduce the number of registrations coming into the HA. This workaround allows HA to process received registrations to free up the input buffers of the interface.
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Symptoms A router may miss the first transmit kick-off interrupt in the ATM driver and cause a queue to buildup and permanent virtual circuit (PVC) drops to occur.
Conditions This symptom is observed on a Cisco MC3810 that is running Cisco IOS Release 12.1.
Workaround There is no workaround.
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Symptoms A Cisco 2611 may reload because of a segmentation violation (SegV) exception.
Conditions This symptom is observed on a Cisco 2611 that is running Cisco IOS Release 12.1(4).
Workaround There is no workaround.
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Symptoms A race condition may cause an H.323 call control block (CCB) to be left dangling when TCP connection delay occurs. This situation can be detected in the output of the show call active voice command, which will show the IP leg call in the active state when there is no active call.
Conditions The race condition may occur when an attempt to establish a TCP connection is not successful and the TCP connection establishment times out because of a delay in the TCP connection. The gateway will attempt to disconnect the call from the time out condition. If the TCP connection is successfully established while the gateway is waiting for a disengage request (DRQ) message then the IP call leg will dangle as a result.
Workaround Increase the H.225 establish time to accommodate a delay in the establishment of a TCP connection by configuring the voice class h323 number global configuration command and the h225 timeout tcp establish seconds voice class configuration command.
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Symptoms During a Home Agent (HA) redundancy operation, the standby HA does not download all bindings from an active HA.
Conditions This symptom is observed when there is a large number of mobility bindings (more than 32,000).
Workaround There is no workaround.
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Symptoms After a router is configured with Home Agent (HA) redundancy using the Hot Standby Router Protocol (HSRP). the router may reload when it is booting up.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(2) or a later release when HA is configured using the HSRP protocol.
Workaround Shut down the interfaces in the HSRP group of the HA and on other HAs in the redundancy group and boot up the router. After the router boots up, reenable the interfaces that were previously shut down.
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Symptoms When both the isdn global-disconnect interface configuration command and the isdn network-failure-cause interface configuration command are configured, the isdn network-failure-cause interface configuration command will replace the received disconnect cause code.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.1(3)XI02.
Workaround There is no workaround.
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Symptoms A Cisco 3660 that is configured for E1 R2 signaling on a voice trunk may reload.
Conditions This symptom is observed under rare conditions on a Cisco 3660 that is running Cisco IOS Release 12.1 or Release 12.2.
Workaround There is no workaround.
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Symptoms A Cisco Multipath Channel (CMPC) configuration on a mainframe channel port adapter (XCAP) or an ESCON channel port adapter (CPA) may cause a read failure on a Flash disk.
Conditions This symptom is observed on a Flash disk.
Workaround Use a Flash card instead of a Flash disk.
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Symptoms A device or interface that is connected to the CPU via a PCI bus may not be recognized at discovery time. The device or interface becomes unusable and a message is displayed. Some platforms may not boot because of the inability to detect a required device or interface. This symptom may persist even after a reboot occurs.
Conditions This symptom is observed on a Cisco router and is unlikely to affect normal system operation.
Workaround There is no workaround. However, repeated reboots or online insertion and removals (OIRs) may cause the device or interface to be recognized.
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Symptoms Calls that are made from a vendor-specific software to a vendor-specific PBX fails.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.1(4.04)T3.
Workaround There is no workaround.
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Symptoms A Cisco 7500 series that is running distributed Cisco Express Forwarding (dCEF) with the debug mpls packet EXEC command enabled may show any debug output from the debug EXEC command on the console.
Conditions This symptom is observed on a Cisco 7500 series that has dCEF enabled.
Workaround There is no workaround.
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Symptoms A router may exhibit poor performance, pause indefinitely, and display error messages that are similar to the following:
00:38:13: %SYS-2-LINKED: Bad enqueue of 0 in queue 6218D0D8
-Process= "<interrupt level>", ipl= 4, pid= 31
-Traceback= 603B6DA4 603B4928 60379CC4 6133667C 613370B8 61344810 61345154Conditions This symptom is observed on a Cisco 1700 series that is running Cisco IOS Release 12.1(4).
Workaround There is no workaround.
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Symptoms IP packets that are fast-switched between the two ATM LAN Emulation (LANE) subinterfaces that are greater than 1494 bytes in size may be corrupted.
Conditions This symptom is observed on a particle-based platform that has two ATM subinterfaces that are running LANE. One of the ATM subinterfaces is in a bridge group with a Bridge-Group Virtual Interface (BVI) that is configured to do IP routing and the other ATM subinterface is configured to perform IP routing.
Workaround There is no workaround.
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Symptoms A router may reload after 120 calls.
Conditions This symptom is observed on a Cisco 7200 series that has an 8-port multiservice interchange multichannel T1 or E1 port adapter (PA-MCX-8TE1) that is configured with a T1 PRI line and Voice over Frame Relay (VoFR). The Cisco 7200 series is running Cisco IOS Release 12.1(5.1)T.
Workaround There is no workaround.
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If you use the mgcp modem passthru {ca} controller configuration command, Pulse Code Modulation (PCM) switchover for fax passthrough does not work properly. Fax calls fail during the training phase.
Workaround: Use the mgcp modem passthru {cisco} controller configuration command.
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Symptoms A H.245 message is dropped if the H.245 message size exceeds 300 bytes if H.245 tunneling is enabled and if H.245 procedures are initiated. This symptom prevents an endpoint from receiving a tunneled H.245 message that exceeds 300 bytes in size.
Conditions This symptom is observed when a Cisco IOS Release 12.1(5)T image is tested.
Workaround If the message is greater than 300 and smaller than 350 bytes use Cisco IOS Release 12.1(5)T. There is no workaround if the message is greater than 350 bytes.
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Symptoms The interface type of packets that are received on a PA-A3-8T1/E1 port adapter interface are not recognized.
Conditions This symptom is observed on a Route Switch Processor (RSP8).
Workaround There is no workaround.
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Symptoms A Cisco AS5800 may reload because of an alignment error and display the following message:
%ALIGN-1-FATAL: Corrupted program counter pc=0x0, ra=0x6046097C, sp=0x628D9C38Conditions This symptom is observed on a Cisco AS5800 that is handling V.120 digital calls and that has IP Cisco Express Forwarding (CEF) enabled. This symptom is observed when the Cisco AS5800 is running Cisco IOS Release 12.1(5)T or a later release.
Workaround There is no workaround.
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Symptoms ISDN hairpinned calls are not completed on a Cisco AS5800.
Conditions This symptom is observed with ISDN hairpinned calls on a Cisco AS5800. ISDN nonhairpinned, nonhairpinned, and modem hairpinned calls function normally.
Workaround There is no workaround.
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Symptoms A loop may be formed when a router has IP tunnels configured. This symptom will cause an indefinite stack recursion when a packet is switched because of the recursive route lookups. This symptom may eventually cause the stack to overflow and the router to reload.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(13)S, 12.0(15)S, and Release 12.1(5)T1.
Workaround Configure static routes for the tunnel destinations.
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Symptoms A AS5300 may pause indefinitely and display an error message on the console.
Conditions This symptom is observed on a Cisco AS5300 that is running the c5300-is-mz.capA8 image of Cisco IOS Release 12.1(4.4)T2.
Workaround There is no workaround.
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Symptoms When Rivest, Shamir, and Adleman (RSA) signature authentication is used for IP Security (IPSec), the router exchanges certificates with the IPSec peer if the router has not previously negotiated with this peer. In this case, the router correctly verifies the peer certificate and checks for the appropriate certificate revocation list (CRL) to ensure that the peer certificate has not been revoked.
In subsequent negotiations with the same peer, the router may fail to obtain and check the appropriate CRL. This behavior may cause the router to negotiate an IPSec connection with a peer that has a revoked peer certificate.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4).
Workaround Reload the router.
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Symptoms When Multiprotocol Label Switching (MPLS) is enabled on an ATM interface, a spurious access may occur if a bind response is received from a Tag Distribution Protocol (TDP)/Label Distribution Protocol (LDP) neighbor for which a matching request cannot be found.
Conditions This symptom is observed after a large routing topology change has occurred and the router may fail to process Bind response messages immediately. This symptom may cause the router to reload unexpectedly. The likelihood of a reload increases if a default route of 0.0.0.0/0 exists in the network.
Workaround There is no workaround.
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When you perform an online insertion and removal (OIR) on a trunk card, a corresponding D channel configuration is lost.
Workaround: Manually reconfigure the interface after performing the OIR.
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A Cisco 2600 or 3600 series router or a Cisco MC3810 multiservice access concentrator with a full load of voice calls may occasionally reload when you use the clear counters EXEC command. This situation also affects the Cisco Catalyst 4000 voice/WAN gateway line card. There is no workaround.
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On a Cisco router that is running Cisco IOS Release 12.1, if you remove the crypto map from an interface and then remove the IP address, the router may reload.
Workaround: Reverse the order of the steps; remove the IP address first and then remove the crypto map.
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A Cisco 2600 or 3600 series router with a Voice/WAN interface card multiflex trunk module T1 line VWIC-xMFT-T1 or VWIC-xMFT-E1 module may experience line code violation (LCV) and parity code violation (PCV) errors. A hardware (vendor) caveat in the framer used on the VWIC-MFT modules may cause the chip to select incorrect nonadaptive receive equalizer settings. There is no workaround.
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Symptoms A Cisco 8230 router that has the Cisco WAN Manager (CWM) enabled may not be able to add interfaces or subinterfaces to the route processor module (RPM) card. The CWM is affected by this condition because the interface interface-type configuration command requires a reference to the slot number being used.
Conditions This symptom is observed on a Cisco 8230 router that has the CWM enabled.
Workaround Use a command or script that does not use the slot number in referencing an interface or subinterface. The slot number is assumed to be the slot/card that you are issuing the command to.
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Symptoms When Cisco Express Forwarding (CEF) is configured, the Forwarding Information Base (FIB) table may conflict with static host routes that are specified in terms of an output interface and Layer 2 address resolution protocols (ARP, map lists, etc.). The Layer 2 address resolution protocol adds adjacencies to CEF, which in turn creates a corresponding host route entry in the FIB table. This entry is called an adjacency prefix. If these adjacency prefix entries are also configured by a static host route, a conflict occurs.
In Cisco IOS Release 12.0 and 12.0 S, the static host route is overwritten by the adjacency prefix. When the adjacency is removed, the static host route is not readded to the FIB table.
Conditions This symptom is observed in Cisco IOS Release 12.0, 12.0 S, 12.1, and Release 12.2.
Workaround Clear the routing table using the clear ip route {*} EXEC command to restore the static host routes.
In Cisco IOS Release 12.1, the static host route is not overwritten by the adjacency prefix. This situation breaks the operation of Layer 2 address resolution protocols such as map lists. There is no workaround.
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Symptoms A DECnet route does not follow the bridging path when Concurrent Routing and Bridging (CRB) is tested.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5.3).
Workaround There is no workaround.
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Symptoms A permanent virtual circuit (PVC) may go from the active status to the inactive status and display "%ATMCES-1-ERRCREATEVC" error messages.
Conditions This symptom is observed if the following actions occur:
–
(config-subif)#shut
(config-subif)# shutdown
(config-subif)# no shut
(config-subif)# no shutdown–
Workaround Reconfigure the PVC or reload the router.
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Symptoms When a broadcast-and-unknown server (BUS) is oversubscribed, RSAR 3.2.1.2 may drop packets continuously without recovering. When this symptom occurs, LAN Emulation (LANE) clients or any permanent virtual circuits (PVCs) will go down and all incoming traffic will be dropped.
Conditions This symptom is observed on a Catalyst 5000 series that is running Cisco IOS Release 12.1(4)E2 or Release 12.0(13)W5(19).
Workaround There is no workaround.
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Symptoms Some trunks may go up or down intermittently after a connection trunk is configured on a Cisco 7200 series.
Conditions This symptom is observed on a Cisco 7200 series.
Workaround There is no workaround.
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On a Cisco AS5400 series universal access server or a Cisco AS5850 universal access server that is running Cisco IOS Release 12.2, after an unsuccessful call on a modem, the modem gets locked and is not available for further calls. There is no workaround.
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A Cisco router may reload if you use the ip inspect name global configuration command to configure Simple Mail Transfer Protocol (SMTP). There is no workaround.
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Symptoms A Call Distributor Application Programming Interface (CDAPI) buffer leak may occur. Raw CDAPI buffers are held up permanently and the number of buffers that are held up increases with the number of call attempts.
Conditions This symptom is observed on a Cisco AS5800 that is running Cisco IOS Release 12.1(05)XM01 in a channel-associated signaling to Voice over IP to channel-associated signaling (CAS-VOIP-CAS) setup.
Workaround There is no workaround.
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Symptoms On a network in which device A is connected to device B through a Cisco 3600 series that is configured for transparent bridging from Ethernet to Token Ring interfaces using a Bridge-Group Virtual Interface (BVI), a ping cannot be sent from device B on the Token Ring to the BVI or device A. Device B can ping device A only after device A pings device B and populates the Address Resolution Protocol (ARP) cache on device B. It is not possible for device B to ping the BVI interface.
Conditions This symptom is observed in a network in which device A is connected to device B through a Cisco 3600 series that is configured for transparent bridging from Ethernet to Token Ring interfaces using a BVI.
Workaround There is no workaround.
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Symptoms The debug output for segmented messages is incorrect.
Conditions This symptom is observed on a Cisco router that has segmentation enabled for Q Signaling (QSIG). This symptom does not affect the normal operation of the router.
Workaround There is no workaround.
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Symptoms A digital signal processor (DSP) of a Cisco 2600 series or Cisco 3600 series may pause indefinitely. Subsequent calls that are made after the DSP pauses will not complete. The following output is displayed when the show voice call summary EXEC command:
PORT CODEC VAD VTSP STATE VPM STATE
=========== ======== === ===================== ========================
1/0/0 g726r32 n S_CONNECT S_TRUNKED
1/0/1 g726r32 n S_CONNECT S_TRUNKED
1/1/0 g726r32 n S_CONNECT S_TRUNKED
1/1/1 - - - FXSLS_ONHOOK
2/0/0 g726r32 n S_CONNECT FXOGS_OFFHOOK
2/0/1 None n S_SETUP_FAIL - - S_SETUP_IND_NO_DSPConditions This symptom is observed on a a Cisco 2600 series or Cisco 3600 series that has a 2-port voice network module (NM-2V) with Foreign Exchange Office (FXO) modules. The router has to be reloaded for the DSP to be returned to normal working condition.
Workaround There is no workaround.
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Symptoms The system Cisco Access Manager (CAM) entries that are created by Multiprotocol over Asynchronous Transfer Mode (MPOA) are not removed when an ATM module is removed, reset, reloaded, or when the ATM card pauses indefinitely.
Conditions This symptom is observed on Catalyst 5000 series and Catalyst 6000 series platforms.
Workaround Reload the Catalyst switch.
Alternate Workaround For a Catalyst switch that has a network management processor (NMP), use Catalyst OS (CatOS) Release 4.5(12), 5.5(7), 6.1(3), 6.2(1) or a later release. For a Catalyst switch that has an ATM line card, use an image from Cisco IOS Release 12.0(14)W5(20) or a later release.
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Symptoms A Cisco 7200 series may display a "%SYS-3-CPUHOG" error message when the clear counters EXEC command is entered.
Conditions This symptom is observed on a Cisco 7200 series that is configured with a large number of PPP sessions.
Workaround There is no workaround.
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Symptoms The output of the show ip bgp vpnv4 vrf vrf-name summary EXEC command shows all Border Gateway Protocol (BGP) peer routers including those that are not related to a specific Virtual Private Network (VPN) routing/forwarding instance (VRF).
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4.06).
Workaround There is no workaround.
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Symptoms A Cisco 7200 series may reload and display the following error message and stop encrypting traffic:
00:09:13: %ISA-1-NOMEMORY: isa_prcoess_hipri_rx: no mr creation failed for slot 3 00:09:13: %ISA-1-NOMEMORY: isa_prcoess_hipri_rx: no mr creation failed for slot 3 00:09:13: %ISA-1-NOMEMORY: isa_prcoess_hipri_rx: no mr creation failed for slot 3 00:09:13: %ISA-1-NOMEMORY: isa_prcoess_hipri_rx: no mr creation failed for slot 3Conditions This symptom is observed on a Cisco 7200 series that has an Integrated Services Adapter (ISA) module. This symptom is observed when a rate of 26,000 frames per second of a frame size of 256 bytes is sent.
Workaround Reload the router.
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Symptoms A Cisco AS5300 Voice over IP (VoIP) gateway may reload because of a bus error.
Conditions This symptom is observed on a Cisco AS5300 VoIP gateway that is running the Cisco IOS c5300-is-mz.capA11 image.
Workaround There is no workaround.
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Symptoms A Cisco 4500 series uses process switching instead of fast switching to process outgoing AppleTalk packets.
Conditions This symptom is observed on a Cisco 4500 series that is running Cisco IOS Release 12.1(6.06), 12.1(5.03)T, or Release 12.2.
Workaround There is no workaround.
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Symptoms When the "clid_authen_col_npw" Tool Command Language (TCL) script is used and when automatic number identification (ANI) authentication fails, the account number and personal identification number (PIN) have to be entered. If the caller chooses not to enter the account number after being prompted do so, there will be no account number value and the ANI will be used as the username. The username shows up as the failed ANI for the accounting records for the three following call legs: answer/telephony, answer/Voice over IP (VoIP), and originate/telephony. The account number that is entered by the caller should be used for the username, as in the accounting record of the Voice over IP (VoIP) leg.
Conditions This symptom is observed on a Cisco voice gateway that is running Cisco IOS Release 12.1(5)T.
Workaround There is no workaround.
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Symptoms Sustained CPU usage of 30 percent may be observed on a Cisco 3600 series.
Conditions This symptom is observed on a Cisco 3600 series that has a 32-port Asynchronous Network Module (NM-32A) when a reverse Telnet is made to the NM-32A.
Workaround There is no workaround.
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Symptoms A router may become irresponsive.
Conditions This symptom is observed on a Cisco AS5300 if the no settlement global configuration command is entered after certificates are reenrolled.
Workaround There is no workaround.
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Symptoms The maximum transmission unit (MTU) of a Bridge-Group Virtual Interface (BVI) changes from 1500 to 1514 after a Cisco MC3810 is reloaded.
Conditions This symptom is observed on a Cisco MC3810 that has a multiflex trunk (MFT) module and that is running Cisco IOS Release 12.0(7)T.
Workaround There is no workaround.
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Symptoms A memory leak may occur on a router.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1 or Release 12.1 T and that has IP Security (IPSec) and multilink enabled.
Workaround Disable fast switching.
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Symptoms Network Based Application Recognition (NBAR) commands such as the ip nbar protocol-discovery interface configuration command can be enabled even when Cisco Express Forwarding (CEF) is not enabled.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0 S, 12.1E or Release 12.2 T
Workaround Enable CEF by entering the ip cef enable global configuration command before enabling NBAR.
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Symptoms In a hub-and-spoke Virtual Private Network (VPN) environment, if a new crypto map instance is added on the hub router while the crypto map is applied to the interface, all clear traffic will be stopped before the crypto peer or the access control list (ACL) is defined.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4)E in a hub-and-spoke VPN environment.
Workaround Remove the crypto map from the interface, add the new map instance, and reapply the crypto map to the interface.
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Symptoms A Cisco 2621 that is connected back-to-back to another router using an Ethernet crossover cable may display an up/up state for the connected router even when the other router has been administratively down.
Conditions This symptom is observed on a Cisco 2621 that is running Cisco IOS Release 12.1(5).
Workaround There is no workaround.
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Symptoms Traceback messages may be displayed and a voice port for a PRI group may not be created.
Conditions This symptom is observed when a Route Switch Processor (RSP) PRI group is configured. This symptom occurs if the PRI group is removed and later reconfigured.
Workaround There is no workaround.
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Symptoms The BRI Layer 1 of a Cisco 1700 series will remain in the DEACTIVATED state when the Cisco 1700 series is loaded with a o3sv3y (voice) image. Sometimes, Layer 1 will come up but Layer 2 will be in the ESTABLISH_AWAITING_TEI state.
Conditions This symptom is observed on a Cisco 1700 series that is running Cisco IOS Release 12.2(0.01).
Workaround If there are no voice ports on the Cisco 1700 series, use the bnr2sy (data-only) image.
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Symptoms The Cisco MGX8260 rejects a create connection (CRCX) command that contains a list of codec as returned after an initial CRCX command is sent to a Cisco AS5300 and forwarded by the virtual switch controller (VSC) that controls the Cisco AS5300. The Cisco MGX8260 rejects the CRCX command because Cisco IOS Software returns a codec list to Media Gateway Control Protocol (MGCP) CRCX command using a dotted notation such as the following:
a=rtpmap:96 G.726-24/8000/1The correct syntax should be:
a=rtpmap:96 G726-32/8000Conditions This symptom is observed on a Cisco AS5300 and a Cisco MGX8260 that is running Cisco IOS Release 12.1(5)T.
Workaround Enter the mgcp sdp notation undotted global configuration command to set undotted notation for encoding in the Shelf Discovery Protocol (SDP). The configuration of this command will cause the Cisco IOS software to produce a list of codecs that the Cisco MGX8260 will accept.
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Symptoms The keepalive feature may not work as expected.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4).
Workaround Disable Internet Security Association and Key Management Protocol (ISAKMP) keepalives.
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Symptoms Several interfaces may not come up after distributed weighted fair queueing (DWFQ) is enabled on channelized interfaces on a Versatile Interface Processor (VIP).
Conditions This symptom is observed on the Cisco Versatile Interface Processor of a Cisco router that is running Cisco IOS Release 12.0 S or Release 12.0 ST.
Workaround There is no workaround.
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Symptoms A software-forced reload may occur on a Cisco AS5300.
Conditions This symptom is observed on a Cisco AS5300 that is running the c5300-is-mz.capA12 image of Cisco IOS Release 12.1(4.4)T2.
Workaround There is no workaround.
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Symptoms A software-forced reload may occur on a Cisco AS5300.
Conditions This symptom is observed on a Cisco AS5300 that is running the c5300-is-mz.capA12 image of Cisco IOS Release 12.1(4.4)T2.
Workaround There is no workaround.
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Certain errors (such as excessive Ethernet collisions) may cause a Cisco uBR900 series router to reload. There is no workaround.
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Symptoms Distributed Cisco Express Forwarding (dCEF) may be disabled on a Cisco 12000 series because of a low-memory condition during a large routing update (for example, while booting up).
Conditions This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0(14)S.
Workaround Reduce the maximum path in Border Gateway Protocol (BGP) to reduce amount of information Cisco Express Forwarding (CEF) propagates to the line cards, or reduce TCP window size to reduce the speed of incoming BGP updates.
Alternate Workaround Enter the ip cef linecard ipc memory kbps interface configuration command. The amount of line card memory is limited to 50 percent of the total memory. This command allows a user to allocate a larger amount of line card memory to be allocated to the queueing for CEF routing to update messages. The command allows the route processor to free memory by releasing CEF updates more quickly and it prevents the low-memory condition from occurring on the route processor.
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Symptoms Static routes that are redistributed into the Routing Information Protocol (RIP) may not appear in the RIP database and will not be advertised to any neighbor after the interface that the static route points to goes up.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(5a).
Workaround Clear the routing table entry by entering the clear ip route privileged EXEC command.
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Symptoms On an originating Cisco universal access server that is running Cisco IOS Release 12.2(1) and a terminating Cisco universal access server that is running Cisco IOS Release 12.0(7)T, the negotiated packet size of the voice codec is the default size instead of the size specified by the configuration.
Conditions This symptom is observed in a network that has an originating Cisco universal access server that is running Cisco IOS Release 12.2(1) and a terminating Cisco universal access server that is running Cisco IOS Release 12.0(7)T.
Workaround There is no workaround.
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Symptoms The CISCO-MODEM-MGMT-MIB MIB may not be supported.
Conditions This symptom is observed on a Cisco 3620 that is running the c3620-js-mz.121-5.T image of Cisco IOS Release 12.1(5)T.
Workaround There is no workaround.
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Symptoms A large burst of traffic that could exhaust the receive buffers on a Cisco 1-port ATM OC-3c network processor module (NP-1A) controller may cause the interface to pause indefinitely on the receive side. This condition can be cleared by entering the shutdown interface configuration command followed by the no shutdown interface configuration command on the interface.
Conditions This symptom is observed on a Cisco 4500 series that has a NP-1A network processor module controller and that is running Cisco IOS Release 12.0(12).
Workaround Enter the atm ilmi-keepalive interface configuration command. This workaround may not always be effective.
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Symptoms The CCH323_CT process may hold 144 MB of memory on a Cisco AS5800 universal access server that is acting as a terminating gateway.
Conditions This symptom is observed in a network in which two Cisco AS5800 universal access servers are used; one as an originating and the other as a terminating gateway. The two Cisco AS5800 universal access servers are running the c5800-p4-mz.122-0.1 image of Cisco IOS Release 12.2(1). No call drops or other side effects were observed when this symptom occurs.
Workaround There is no workaround.
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When a Modem ISDN channel aggregation (MICA) modem goes to a "bad" state during an active call, the corresponding line and asynchronous interface data structures may fail to clear. This situation may result in incorrect accounting records being generated.
Workaround: Enter the clear interface async EXEC command to reset the interface and line data structures.
Alternate workaround: Enable PPP link control protocol (LCP) keepalive on the interface (for example, using the keepalive 15 interface configuration command on the applicable asynchronous, group-asynchronous, dialer, or virtual-template). This workaround may cause the interface line to clear automatically when the modem goes bad.
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Symptoms A Cisco enhanced ATM port adapter (PA-A3-xx) may not be able to provide correct traffic shaping if a combination of peak cell rate (PCR)/sustainable cell rate (SCR)/maximum burst size (MBS) for variable bit rate (VBR) virtual circuits (VCs) is used in such a way that the "Limit" calculated according to Generic Cell-Rate Algorithm (GCRA) (specified in ATM Forum TM4.0), comes out to be greater than 0xFFFFFF (Hex) or 16777215 (decimal) value. This symptom occurs because of a limitation on the Cisco PA-A3-xx port adapter.
Conditions This symptom is observed on the Cisco PA-A3 port adapter of a Cisco router that is running Cisco IOS Release 12.1(5a).
Workaround There is no workaround.
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Symptoms A Toolkit Command Language (TCL) interactive voice response (IVR) 2.0 application script that is running on a Cisco voice gateway may abort during a call with the "language not specified in the configuration" error message.
Conditions This symptom occurs if the TCL IVR 2.0 script contains the "infotag set med_language 1" command if language 1 is not specified using the command-line interface (CLI) of the Cisco voice gateway.
Workaround Remove the "infotag set med_language 1" command from the TCL IVR 2.0 script or configure a language using the CLI of the call application.
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Symptoms A Cisco AS5300 may reload if the no aaa group server global configuration command is entered several times for the same server group.
Conditions This symptom is observed on a Cisco AS5300 that is running Cisco IOS Release 12.1(5)T or Release 12.2.
Workaround Avoid entering the no aaa group server global configuration command repeatedly for the same server group. As soon as a server group is not used for any further RADIUS server communication (after all Radius replies have been received), the server group will disappear.
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Symptoms The Cisco DistributedDirector may reload and display traceback messages when a configuration change is made while the Cisco DistributedDirector is operating under a heavy load.
Conditions This symptom is observed if a configuration is changed on a Cisco DistributedDirector while it is operating under a heavy load.
Workaround There is no workaround.
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Symptoms When a call is made from a Cisco gateway to a public switched telephone network (PSTN) or PBX analog phones through a high density voice network module (NM-HDV), the call setup is established but speech does not pass through. Complete silence is observed at both ends of the call.
Conditions This symptom is observed when a call is made from a Cisco gateway to a PSTN or PBX analog phone through a NM-HDV voice network module.
Workaround To correct this symptom, install an analog Foreign Exchange Station (FXS) module on the Cisco gateway.
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Symptoms A Cisco AS5800 may reload after about 1000 calls.
Conditions This symptom is observed on a Cisco AS5800 when ISDN to channel-associated signaling (CAS) or from CAS to ISDN hairpinned calls are made,
Workaround There is no workaround.
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Symptoms When IP Security (IPSec) peers are configured with Access Control List (ACL) entries that do not match, but one ACL includes the other ACL, one of the following two situations occurs:
Correct behavior occurs if the IPSec peer with the more restrictive ACL initiates the connection, and then offers a more restrictive IPSec proxy. This proxy is accepted by the IPSec peer with the less restrictive ACL, if the less restrictive ACL completely covers the more restrictive offered IPSec proxy.
Incorrect behavior occurs if the IPSec peer with the less restrictive ACL initiates the connection, and then offers a less restrictive IPSec proxy. This proxy is accepted by the IPSec peer with the more restrictive ACL. The IPSec peer with more restrictive ACL should reject the less restrictive offered IPSec proxy.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(14) or Release 12.1(5) when IPSec peers are configured with ACL entries that do not match.
Workaround Ensure that the IPSec ACL entries match correctly on both sides and are exact mirror images of each other.
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Symptoms Bindings cannot be created if a router is acting as both a Home Agent (HA) and a Foreign Agent (FA).
Conditions This symptom is observed on a Cisco router that is acting as both a Home Agent (HA) and a Foreign Agent (FA).
Workaround There is no workaround.
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Symptoms E1 alarms are not working according to standards that are specified in International Telecommunication Union-Telecommunications Standards Section (ITU-T) G.704. When a faulted multiframe alignment frame signal is detected, the router does not detect the alignment fault event and send a console message in response to the faulted alignment frame signal.
Conditions This symptom is observed on a Cisco 3600 series that is running Cisco IOS Release 12.1(3a)XI02.
Workaround There is no workaround.
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Symptoms After a Cisco AS5300 is upgraded, the voice port that were created by the initial Cisco IOS software version for Non-Facility Associated Signaling (NFAS) group members may lose that association.
Conditions This symptom is observed on a Cisco AS5300 after it is upgraded from Cisco IOS Release 12.1(2a)T2 to Release 12.1(5)T.
Workaround There is no workaround.
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Symptoms When the copy ftp:// command is entered to download an image from a FTP server, the image is downloaded several times. In a network that has slow links, this method of download cause the operation to take longer than it would if the image was downloaded only once.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4). This symptom does not affect Cisco IOS Release 12.0.
Workaround There is no workaround.
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Symptoms A Cisco 7200 series may pause indefinitely if Cisco Appliance Server Architecture (CASA) is used together with Cisco Express Forwarding (CEF).
Conditions This symptom is observed on a Cisco 7200 series that is running Cisco IOS Release 12.1(4)DB, 12.1(4)DC, 12.1(4.04)E, 12.1(4.04), 12.1(4.004)AA, 12.1(4.04)T, or a later release.
Workaround Disable CEF.
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Symptoms Committed access rate (CAR) with an access control list (ACL) does not function on a Gigabit Inter-Switch Link (ISL) subinterface for output.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(4)E.
Workaround Use CAR for all traffic.
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Symptoms A Cisco router may reload
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(05.03)T reloads when the following events occur:
–
–
–
Workaround There is no workaround.
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A Cisco AS5300 series universal access server that is running the c5300-is-mz.capA12 image (based on Cisco IOS Release 12.1(4.4)T2) may reload by bus error. There is no workaround.
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Symptoms When you enter the show mpls forwarding-table EXEC command, CPU utilization may approach 100 percent. This situation may lead to various performance-related problems.
Conditions This symptom is observed when the Multiprotocol Label Switching (MPLS) forwarding table contains several thousand forwarding entries for Traffic Engineering (TE) tunnels. When the CPU load gets that high, some of TE tunnels may flap.
Workaround The condition can be greatly alleviated by running the command with automore enabled.
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Symptoms A Cisco access server may reload with a bus error in rm_rpm_resource_allocate_success.
Conditions This symptom is observed on a Cisco access server that is running the Resource Pooling feature.
Workaround There is no workaround.
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Symptoms On a Cisco router, few security associations (SAs) come down and recover immediately.
Conditions This symptom is observed when you create multiple IP Security (IPSec) tunnels (500) with an Internet Key Exchange (IKE) lifetime of 86,400 seconds and an IPSec lifetime of 180 seconds. All 500 IKE SAs are established. Over a period of time, with continuous traffic, few IKE SAs (around 1 to 5) come down and recover immediately. This situation occurs prior to IKE rekeying, and the router does recover by itself, so there is no functional impact. The IKE SAs begin terminating any time there is a retransmission during quick mode (QM). The retransmissions continue after QM finishes successfully. After 4 attempts, QM deletes the IKE SAs.
Workaround There is no workaround.
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Symptoms The show users EXEC command reports the active time that a call has been connected instead of the idle time for the call.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A line card to route processor queue can grow too large causing malloc failures on the line card.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with Engine 2 line cards.
Workaround There is no workaround.
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Symptoms Open Settlement Protocol (OSP) calls fail during a Secure Socket Layer (SSL) handshake to a third-party SSL server because of a rejected certificate.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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A Cisco Versatile Interface Processor 2-50 (VIP2-50) card with two channelized T1 PRI port adapters (PA-2CT1/PRI) reloads when you load the rsp-a3jsv-mz image in Cisco IOS Release 12.2(0.2). There is no workaround.
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Symptoms A Cisco 3600 series may not generate any command output when you enter the show access-list access-list-number EXEC command.
Conditions This symptom is observed on a Cisco 3600 series router that is running Cisco IOS Release 12.1(5)T.
Workaround Insert a space after the access-list-number argument.
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Symptoms The information in RADIUS Attribute 44 (Accounting Session ID) in an access-request and in an accounting-request must be the same but is not.
Conditions This symptom is observed in Cisco IOS Release 12.1(4)DC1.
Workaround There is no workaround.
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Symptoms A Cisco 3640 router pauses indefinitely.
Conditions This symptom is observed after many spurious memory accesses.
Workaround There is no workaround.
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Symptoms A Secure Shell (SSH) session pauses indefinitely.
Conditions This symptom is observed after you enter the show tech-support EXEC command or the configure network EXEC command on a Cisco 12000 series router.
Workaround There is no workaround.
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Symptoms When you enable IP Cisco Express Forwarding (CEF), a bus error may occur.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms After firmware has reloaded unexpectedly, configured interfaces may go into a loopback mode.
Conditions This symptom is observed on a 8-port multichannel E1 port adapter (PA-MC-8E1).
Workaround Unconfigure the loopback from the interfaces one by one
Alternate Workaround Enter the shutdown controller configuration command followed by the no shutdown controller configuration command on the controller on which the interfaces are configured.
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Symptoms A Cisco AS5300 reloads because of a bus error.
Conditions This symptom is observed on a Cisco AS5300 that is running the c5300-is-mz image of Cisco IOS Release 12.1(4.4)T2, that is functioning as a Voice over IP (VoIP) ingress gateway, and that is configured with two E1 R2 trunks.
Workaround There is no workaround.
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Symptoms Acknowledgements of RADIUS resource accounting packets may not be processed correctly, causing the accounting record to be improperly send again. When you enable the debug radius command, messages such as the following may be seen:
RADIUS: Received from xxx.xxx.xxx.xxx - un-sane packetOther RADIUS accounting packets work normally.
Conditions This symptom is observed on a Cisco AS5400.
Workaround Disable the Resource Accounting feature.
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Symptoms If a recursive route, for example from Border Gateway Protocol (BGP), is resolved using the default route and if a route that is more specific to the recursive prefix should subsequently be inserted into the database, Cisco Express Forwarding (CEF) may fail to reresolve the recursive route to use this new route rather than the default route.
Conditions This symptom is observed during route flaps in which the original route that a recursive route resolves to temporarily disappears. The recursive route is then left permanently resolved through the default route even after the original route reappears.
Workaround Clear the recursive route using the clear ip route {network [mask]} EXEC command. This will force the rediscovery and reresolution of the recursive route.
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Symptoms On a Cisco AS5300 that is functioning as an originating gateway and another Cisco AS5300 that is functioning as a terminating gateway, when you use interactive voice response (IVR) to let the originating gateway send an answer to an originating PBX after the called party is off hook, the parties cannot hear each other because the originating switch does not send an answer to the originating gateway.
Conditions This symptom is observed when the originating gateway is running Cisco IOS Release 12.1(4.4)T2, the terminating gateway is running Cisco IOS Release 12.0(7)T, and the originating gateway incoming dial-peer is configured as follows:
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Workaround There is no workaround.
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Symptoms When Feature Group-D (FGD) is functioning with multifrequency (MF) tones and automatic number identification (ANI), there is no option to control if an access server reports address signaling codes with ANI.
Conditions This symptom is observed on a Cisco AS5300 and a Cisco AS5800.
Workaround There is no workaround.
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Symptoms An input Q wedge may occur on a Cisco 3640 router.
Conditions This symptom is observed on a Cisco 3640 router that is running Cisco IOS Release 12.1(4) and occurs during normal operation.
Workaround There is no workaround. A temporary workaround, reload the router until the symptom occurs again.
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Symptoms A codec list that is returned after a create connection (CRCX) request lacks consistency and order.
Conditions This symptom is observed when a CRCX request is sent to a Cisco AS5300.
Workaround There is no workaround.
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Symptoms If you remove a traffic engineering (TE)-related configuration state for one or more TE tunnels while displaying the TE tunnels, an error message that reports a spurious memory access may be generated, or in very rare circumstances, a system may reload.
Conditions This symptom is observed in Cisco IOS software that is not based on Cisco IOS Release 12.0 S and that is running Multiprotocol Label Switching traffic engineering (MPLS TE) when you attempt to unconfigure TE tunnels while simultaneously displaying TE tunnels using the show mpls traffic-eng tunnels EXEC command.
Workaround There is no workaround.
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Symptoms A Multilink PPP (MLP) over ATM session may not recover.
Conditions This symptom is observed after an interface flaps, or you enter the shutdown interface configuration command followed by the no shutdown interface configuration command on an interface.
Workaround To recover the connection, reconfigure the dialer pool-member interface configuration command on the permanent virtual connection (PVC). To ensure that the symptom does not occur again, configure the no keepalive interface configuration command on the dialer interface that is used for MLP.
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Symptoms A Layer 2 class of service (COS) on a Fast Ethernet Inter-Switch Link (ISL) and dot1q subinterfaces may not to send out expected packages.
Conditions This symptom is observed in Cisco IOS Release 12.2(3) and Release 12.2(3)T.
Workaround There is no workaround.
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If you change a policy-map configuration during a heavy traffic load, a Versatile Interface Processor (VIP) may display an "output stuck" error. The VIP may stop forwarding packets until it is reset automatically. This situation is specific to a Frame Relay configuration when there are permanent virtual circuits (PVCs) that are shaped using Distributed Traffic Shaping (DTS). This situation occurs when all the PVCs are congested and you make a change to the policy map.
Workaround: Shut down the physical interface before changing the policy map, then reenable the interface.
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Symptoms You may not be able to use the command-line interface (CLI) because a voice resource cannot be debugged.
Conditions This symptom is observed on a Cisco AS5800.
Workaround There is no workaround.
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Symptoms A router may reload when you unconfigure class-based weighted fair queueing (CBWFQ)/low latency queueing (LLQ) from a dialer.
Conditions This symptom is observed in a Multilink PPP (MLP) configuration when a member link is not an ISDN link but another link, such as PPP over ATM (PPPoATM).
Workaround There is no workaround.
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Symptoms The following traceback may occur:
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x60443C00 reading 0x40
%ALIGN-3-TRACE: -Traceback= 60443C00 6040C4F8 6010F9EC 60113834 00000000 00000000 00000000 00000000Conditions This symptom is observed in Cisco IOS Release 12.1(5.3)T when you use the idle timer on a dialer interface that is configured for PRI.
Workaround There is no workaround.
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Symptoms High CPU utilization that is caused by process CCH323_CT may occur on a Cisco AS5300. After you have removed all the calls that were processed by the Cisco AS5300, the CCH323_CT process continues to run high, and no calls can be established.
Conditions This symptom is observed after hours of processing calls on a Cisco AS5300 router that is configured as a terminating gateway (TGW).
Workaround There is no workaround. For the TGW to accept calls again, reload the Cisco AS5300.
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Symptoms A Cisco 3640 router may reload when the priority bandwidth that is allocated to voice calls is less than the minimum required amount.
Conditions This symptom is observed when you use link fragmentation and interleaving (LFI) over ATM links.
Workaround Allocate the minimum priority bandwidth for voice calls.
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A Cisco AS5400 series universal access server that is running Cisco IOS Release 12.2 may reload while running voice calls. There is no workaround.
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Symptoms Engine 2 Packet-over-SONET (POS) line cards on a Cisco 12000 series router may be severely affected and may reset if hundreds of Multiprotocol Label Switching (MPLS) traffic engineering (TE) tunnel interfaces are unconfigured simultaneously.
Conditions This symptom is observed under heavy stress conditions such as the presence of several Border Gateway Protocol (BGP) and Open Shortest Path First (OSPF) routes and heavy line rate traffic.
Although the symptom is observed on Engine 2 POS line cards, it is platform independent and may occur on any Cisco router that is running MPLS with TE tunnels.
Workaround There is no workaround.
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Symptoms When distributed Multilink PPP (dMLP) is enabled, the PPP multilink fails on Link Control Protocol (LCP) negotiation, and serial links that are not members of the multilink bundle may be brought down.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms RADIUS sends the h323-conf-id vendor-specific attribute (VSA) for all Cisco platforms even though H.323 is not supported for most Cisco platforms, which may cause incompatible communication between RADIUS servers and Cisco IOS software.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco Serving GPRS Support Node (SGSN) does not handle flow label management correctly.
Conditions This symptom is observed when packet data protocol is deleted.
Workaround There is no workaround.
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A Cisco AS5300 series universal access server that is running channel-associated signaling (CAS) to Signaling System 7 (SS7) calls or CAS to H.323 calls may reload unexpectedly because of a bus fault at "ccFreeRawMsgInfo". There is no workaround.
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Symptoms A Resource Reservation Protocol (RSVP) session may not be installed on a Cisco 7500 series interface.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS Release 12.1, Release 12.1 E, Release 12.2, or Release 12.2 T when class-based weighted fair queueing (CBWFQ) is enabled on the interface and both the ip rsvp bandwidth and service-policy output interface configuration commands are enabled on the interface.
Workaround There is no workaround.
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Symptoms When you run a Network Service Engine 1 (NSE-1) with Parallel Express Forwarding (PXF) enabled, some packets may not be forwarded if they are routed via the default route. This situation causes PXF to be disabled.
Conditions This symptom is observed on a Cisco 7200 series router.
Workaround Disable PXF and enable Cisco Express Forwarding (CEF).
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Symptoms A token object identifier (OID) that is sent back may not be the token OID that was originally received, which results in call setup failure.
Conditions This symptom is observed when you interoperate with a gatekeeper in the signaling mode (nondirectory gatekeeper), and the gatekeeper is configured to use security. The OID that is sent back from the Cisco gateway may not be the token OID that was originally received.
Workaround There is no workaround.
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Symptoms A Cisco 7513 router may reload when you modify the policy-map default-class queue size, and the following message may appear:
%ALIGN-1-FATAL: Illegal access to a low address addr=0x20, pc=0x60417FBC, ra=0x60417FC4, sp=0x62D26360Conditions This symptom is observed on a Cisco 7513 router that is running the rsp-isv-mz image of Cisco IOS Release 12.1(5)T1 and that is configured with an enhanced ATM DS3 port adapter after exiting the class configuration mode.
Workaround There is no workaround.
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Symptoms An IP security (IPSec) tunnel continues to flap.
Conditions This symptom is observed when traffic is running between two IPSec peers and on one peer you enter the crypto card shut 5 command (when a hardware encryption card is installed in slot 5) and the microcode reload global configuration command.
Workaround Do not enter the crypto card shut command while traffic is running. If you do shut down the hardware encryption card, first stop the traffic. Before you bring the hardware encryption card back up again, enter the clear cry sa and clear crypto isakmp EXEC commands on both peers.
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Symptoms An image with k8 or k9 in the image name reloads on startup because the crypto subsystem does not recognize k8 or k9 as a valid name.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco 800 router reloads when a telephone goes offhook.
Conditions This symptom is observed when the Cisco 800 router is configured with a plain old telephone service (POTS) port that is configured for a leased line. The router reloads when the telephone that is connected to the POTS port goes offhook.
Workaround There is no workaround.
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Symptoms 128-bit Microsoft Point-to-Point Encryption (MPPE) encryption does not function on hardware in an Integrated Services Module (ISM).
Conditions This symptom is observed on a Cisco 7100 series router.
Workaround There is no workaround.
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Symptoms Fair-queue queue-limit modifications are not retained on a Cisco 7513 router.
Conditions This symptom is observed on a Cisco 7513 router that is running the rsp-isv-mz image of Cisco IOS Release 12.1(5)T1 and that is configured with an enhanced ATM DS3 port adapter after you have modified the fair-queue queue-limit value. The new value takes affect and is displayed in the running configuration, but after the router had reloaded, the modifications are lost and the value reverts to the default value.
Workaround There is no workaround.
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Symptoms Noise is heard on a Foreign Exchange Station (FXS).
Conditions This symptom is observed when Voice over IP (VoIP) calls go through a Cisco ICS7700 series Multiservice Route Processor (MRP), and a call is made from one FXS to a second FXS. Noise is heard periodically at the second FXS after the call is answered.
Workaround There is no workaround.
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Symptoms A Translational Lookaside Buffer (TLB) store exception may occur.
Conditions This symptom is observed when the dir disk number EXEC command, where number is the number of the PCMCIA slot, is entered at the ROMMON prompt while there is an ATA disk in that PCMCIA slot of a High End System (HES).
Workaround There is no workaround.
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Symptoms A Cisco router may reload with a bus error and displays the following error message:
System returned to ROM by bus error at PC 0x2057A4C, address 0x0Conditions This symptom is observed during a Simple Network Management Protocol (SNMP) walk.
Workaround There is no workaround.
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Symptoms Systems Network Architecture Switching Services (SNASw) may send a topology database update (TDU) to its network node server (NNS) with the LAST_FRSN_SENT field set to 0. A zero value causes the NNS to purge all the previously registered TF vectors (TGVs) for that end node (EN). This situation may result in an "80140001" sense code for a logical unit (LU) session setup.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco 7500 series router that is configured with TC-ATM (Tag-Controlled ATM) interfaces and that has the Multi-VC feature enabled may stop forwarding traffic to the prefixes that are reachable via the Multi-VC feature when distributed Cisco Express Forwarding (dCEF) is enabled.
Another symptom is that the output of the show ip cef vrf vrf-name ip-prefix EXEC command does not display the tag rewrite correctly when the Border Gateway Protocol (BGP) nexthop is reachable via the Multi-VC feature. This symptom is just a cosmetic problem and no workaround is necessary.
Conditions These symptoms are observed after some time in an environment where the Interior Gateway Protocol (IGP) routes are flapping frequently.
Workaround There is no workaround.
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On a Cisco router with continuous traffic flowing through an IP Security (IPSec) tunnel, if you try to change the crypto ipsec transform-set transform-set-name transform1 global configuration command (with intranetset as the transform-set-name and ah-md5-hmac esp-des as transform1) to include comp-lzs, the router displays the following error message and reloads:
-Traceback= 61410F08 613F79A4 613F7BF4 613F9BFC 60452CA4 60452C90
*** System received a Bus Error exception *** signal= 0xa, code= 0x10, context= 0x6204c400 PC = 0x6047d87c, Cause = 0x420, Status Reg = 0x34008002 rommon 2 >Workaround: Do not modify the transform set. Stop the traffic, negate the existing transform set, and use a new transform set with the additional required options. Be sure that the transform set is not being used by any crypto map before removing the transform set.
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Symptoms The output of the show voice dsp EXEC command is incorrect and impedes troubleshooting of digital signal processors (DSPs). This situation does not affect proper voice operation on the router.
Conditions This symptom is observed on a Cisco 7200 series router that is running Cisco IOS Release 12.1(3)XI.
Workaround There is no workaround.
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Symptoms A disconnect message with a progress indicator may be sent to a router, which causes the router to reload.
Conditions This symptom is observed when you dial an unresolved number on a Public Switched Telephone Network (PSTN) and hang up.
Workaround There is no workaround.
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Symptoms Memory is depleted when you use compression connections commands or when you toggle distributed fast switching with compression.
Conditions This symptom is observed when you reinitialize compression on a router without disabling compression.
Workaround There is no workaround.
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Symptoms When an ip inspect command is configured for TFTP and the size of the file that is transferred is smaller than 512 bytes (and thus needs only a single packet), the return acknowledgement (ACK) packet is discarded. This situation greatly impacts the configuration file of a Data-Over-Cable Service Interface Specifications (DOCSIS) cable modem.
This behavior does not occur when the size of the file that is transferred is 512 bytes or larger.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco 3640 router may enter into a loop after it has reloaded.
Conditions This symptom is observed on a Cisco 3640 router that is running Cisco IOS Release 12.1(5)T or a later release when the exception logging size is not configured.
Workaround Configure the exception logging size using the logging exception size configuration command.
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Symptoms Inbound and outbound calls are dropped because of a glare condition when the Foreign Exchange Office End Ground Start (FXOGS) voice processor module (VPM) Finite State Machine (FSM) disconnects both calls as a result of an illegal event in the FSM. The output of the debug vpm error command displays the following error message:
[FXOGS_ONHOOK, E_HTSP_EVENT_TIMER] -> ERROR: INVALID INPUT.Conditions This symptom is observed on a Cisco router when an inbound call and outbound call are placed on an Foreign Exchange Office (FXO) Ground Start line.
Workaround There is no workaround.
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Symptoms A Cisco IOS voice gateway may reload with the following error message when user authentication is occurring:
%ALIGN-1-FATAL: Illegal access to a low addressConditions This symptom is observed when you use the tool command line (TCL) interactive voice response (IVR) 2.0 application.
Workaround There is no workaround.
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Symptoms A Cisco 7200 series router when reloads you boot up the router with an image of Cisco IOS Release 12.2.
Conditions This symptom is observed on a Cisco 7200 series router that is configured with a C7200-I/O-GE+E or C7200-I/O-2FE I/O controller.
Workaround There is no workaround.
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Symptoms A router that is running Systems Network Architecture Switching Services (SNASw) may reload because of memory corruption.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A router may display the following error message because an invalid event occurs when the Foreign Exchange Office End Ground Start (FXOGS) Finite State Machine (FSM) is in the "FXOGS_WAIT_ONHOOK" state.
[FXOGS_WAIT_ONHOOK, E_DSP_SIG_0000] -> ERROR: INVALID INPUTConditions This symptom is observed on a Cisco router that is running Foreign Exchange Office (FXO) Ground Start.
Workaround There is no workaround.
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Symptoms Because of an illegal memory access, spurious memory accesses may occur on a router, or the router may reload.
Conditions This symptom is observed when you use the ip rtp header-compression interface configuration command under stress conditions.
Workaround There is no workaround.
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Symptoms A Cisco 7204VXR reloads because of a bus error at PC 0x613C4348, address 0x47C, when you attempt to store voice mail (that is, you attempt to light the message indicator) at a remote site telephone.
Conditions This symptom is observed in a topology with a Cisco 7204VXR at the headend and Cisco 2600 series routers a remote site, running Voice over IP (VoIP) and Q Signaling (QSIG) to PBXs. The voice mail is located on a PBX at the headend.
Using #175, an extension number, and #11 causes the same effect as having the router reload.
The debug isdn q931 and debug isdn q921 EXEC commands do not reveal any useful information.
Workaround There is no workaround.
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Symptoms An incoming call may be rejected because of a requested circuit or channel is not available.
Conditions This symptom is observed in a high call rate situation when a bearer (B) channel is incorrectly associated with an idle modem and is stuck in this state indefinitely.
Workaround There is no workaround.
As a temporary workaround, busyout the DS0 timeslot that is stuck or you enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the interface with the DS0 timeslot that is stuck. However, this temporary workaround may lead to locking out modems from being used to take calls and may eventually lead to resources being completely unavailable, which is an unrecoverable situation.
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Symptoms A Cisco AS5850 may reload.
Conditions This symptom is observed when Channel Associated Signaling (CAS) is configured on T1 or E1 controllers.
The Cisco AS5850 may reload when a T1 or E1 CAS controller goes down before the system has taken more than 3348 CAS or ISDN analog calls. This symptom occurs about once every 80 to 160 times a T1 or E1 controller goes down.
Workaround There is no workaround.
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Symptoms The following vendor-specific attributes (VSAs) cannot be send:
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When you attempt to send any one of the above-mentioned VSAs, the following message is generated:
authentication: av-send error
Tcl_Eval Failed in action=act_Setup code=1 code=ERROR
IVR TCL script failure
Result: authentication errorConditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
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Symptoms High CPU utilization may occur on a DistributedDirector. This situation causes the watchdog timer to expire and DistributedDirector to reboot.
Conditions These symptoms are observed when you enable the multiple resource record (RR) feature, and DistributedDirector is configured to return multiple resource records (RRs) in Domain Name System (DNS) answers.
Workaround Disable the multiple RR feature.
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Symptoms Internet Key Exchange (IKE) phase2 mail fail.
Conditions This symptom is observed when crypto access control lists (ACLs) that are used for several tunnels overlap (that is, the ACLs contain one another).
Workaround There is no workaround.
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Symptoms A Cisco router may generate the following message because the event "E_HTSP_CONNECT" is not a valid event when the Foreign Exchange Office End Ground Start (FXOGS) Finite State Machine (FSM) is in the "FXOGS_WAIT_ONHOOK" state.
[FXOGS_WAIT_ONHOOK, E_HTSP_CONNECT] -> ERROR: INVALID INPUTThis situation does have a harmful effect on a call because the call is in the process of being disconnected anyway.
Conditions This symptom is observed on a Cisco router that is running Foreign Exchange Office (FXO) Ground Start. The FSM generates an error because of a race condition that queues a connect and a disconnect event one right after the other.
Workaround There is no workaround.
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Symptoms Link control protocol (LCP) negotiation fails and a distributed Multilink PPP (dMLP) bundle never comes up with all its associated member links.
Conditions This symptom is observed when you configure dMLP on the serial links that belongs to an 8-port multichannel E1 port adapter (PA-MC-8E1).
Workaround There is no workaround.
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Symptoms Some images are too large to fit in the available Flash memory.
Conditions This symptom is observed
Workaround Use a smaller image.
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Symptoms A Cisco Catalyst 5000 series switch does not work properly because of a memory leak of packet buffers that are used for keepalive packets from the Cisco Catalyst 5000 series switch to a router.
Conditions This symptom is observed on a Catalyst 5000 series switch that is running Cisco IOS Release 12.1 T or Release 12.1 E and that is using Multicast Multilayer Switching (MMLS) in conjunction with Layer 3 switching hardware. MMLS is disabled by default on the Cisco Catalyst 5000 series switch. If you enable MMLS on the switch, MMLS causes the management interface or virtual LAN for MMLS to wedge the input queue. This situation does not impact Cisco Catalyst 6000 series switches.
Workaround There is no workaround.
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Symptoms When Fast Ethernet gets throttled on a Cisco AS5400, it may remain throttled even after all the packets in the input hold queue are processed.
Conditions This symptom is observed on a Cisco AS5400 that is running Cisco IOS Release 12.1 T and that has terminating digital Multilink Point-to-Point protocol (MLPPP) calls with Layer 2 Tunneling Protocol (L2TP) or a Virtual Private Dialup Network (VPDN).
Workaround Clear the Fast Ethernet interface.
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Symptoms During a large routing table update (for example, when the clear ip bgp * EXEC command is entered), the CPU utilization may increase dramatically.
Conditions This symptom is observed when the Cisco Express Forwarding (CEF) Event Logger feature is enabled.
Workaround Turn off part of the Event Logger feature using the ip cef table event-log traceback depth 0 global configuration command.
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When a Cisco router is connected to a PBX and the router needs to send a B3 signal to indicate busy status, the PBX does not interpret this B signal and consequently the PBX does not send the busy tone. If you connect the router to a central office switch, the switch sends the busy tone after receiving the B3 signal. However, there are some PBXs that do not interpret the B signals correctly. There is no workaround.
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Symptoms A phase1 security associations (SAs) setup can take more than one minute because of a delay with the transmission of Domain Name System (DNS) requests, which eventually leads to a timeout of the DNS requests.
Conditions This symptom is observed when Rivest, Shamir, and Adelman (RSA) encryption authentication is used in an Internet Key Exchange (IKE), and if the DNS is not configured, nor disabled.
Workaround There is no workaround.
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Symptoms Spurious memory accesses and tracebacks may occur. The router may also reload.
Conditions These symptoms are observed when modular quality of service command-line interface (MQC) based features are configured in a Frame-Relay environment.
Workaround There is no workaround.
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Symptoms TCP sessions cannot be initiated with an IP Security (IPSec) peer.
Conditions This symptom is observed when the server or client is a Cisco 2600 series or Cisco 3600 series router that is using the following encryption hardware devices:
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This condition does not occur when software encryption is used.
Workaround TCP sessions must be run across the local (unencrypted) link.
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Symptoms Modem passthrough calls on a Cisco AS5300 may fail.
Conditions This symptom is observed when you configure "codec g711u" under the dial peer router.
Workaround There is no workaround.
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Symptoms When a call is placed to a network access server (NAS) that is running T1 channel-associated signaling (CAS) Feature Group B (FGB), the following message is displayed several times:
CDAPI: cdapi_create_raw_msg(): FOR_RAW_MSGS queue is empty.The Call Distributor Application Programming Interface (CDAPI) memory buffer pool is empty, and the call does not go through.
Conditions This symptom is observed on releases earlier than Cisco IOS Release 12.2.
Workaround There is no workaround.
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Symptoms A spurious memory access occurs in H.323 because of unavailable raw message buffers and a missing null pointer check.
Conditions This symptom is observed when no ISDN interfaces are configured. The Call Distributor Application Programming Interface (CDAPI) raw message buffers are created only when an ISDN interface is configured.
Workaround Enable ISDN on at least one of the interfaces
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Symptoms When an APN (Access Point Name) is configured with access control list (ACLs) for uplink traffic, the input queue on a Gn interface (that is, an interface between two General Packet Radio Service Support Nodes [GSNs] within the same Public Land Mobile Network [PLMN]) may become full.
Conditions This symptom is observed when a MS (Mobile Subscriber) keeps sending traffic that violates the access.
Workaround Do not configure ACLs under the APN.
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Symptoms A progress indicator (PI) appears in the a PRI setup message and a Cisco AS5300 then disconnects the line, which causes callback dialout to fail. "Invalid information element" appears in the STATUS message.
Conditions This symptom is observed when a Cisco AS5300 attempts to use a certain vendor callback function.
Workaround There is no workaround.
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Symptoms The following Foreign Exchange Station (FXS) loopstart state machine errors are displayed in the output of the debug vpm error command:
[S_TRUNKED, E_DSP_INTERFACE_INFO] -> ERROR: INVALID INPUT
[S_TRUNKED, E_HTSP_VOICE_CUT_THROUGH] -> ERROR: INVALID INPUTConditions This symptom is observed when a trunk flaps during capabilities negotiation. These events should be ignored in the loopstart state machine. The errors do not affect trunk establishment or subsequent calls on that trunk.
Workaround There is no workaround.
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Symptoms A Cisco 7500 series router may stop receiving Multiprotocol Label Switching (MPLS) packets on Versatile Interface Processor 2 (VIP2) modules after an online insertion and removal (OIR) event. All MPLS packets are dropped silently, and no counters are incremented.
Conditions This symptom is observed on a Cisco 7500 series router that is configured for Cisco Express Forwarding (CEF)—not distributed CEF (dCEF)—and MPLS. The connectivity is restored after dCEF is enabled.
Workaround Use dCEF globally and disable it on per interface basis if needed.
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Symptoms Internet Key Exchange (IKE) messages may not properly encrypt and decrypt, causing the security associations (SAs) to be deleted.
Conditions This symptom is observed on a Cisco 7100 series router that functions in a large scale hub-and-spoke IP security (IPSec) Virtual Private Network (VPN) environment with 500 peers when there are simultaneous IKE sessions terminating on the same gateway.
Workaround There is no workaround.
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Symptoms A cable modem (CM) incorrectly increases docsBpiCmTEKAuthPends. When the CM receives an Authorization Invalid message with an error code "0" (which indicates "no information") from a cable modem termination system (CMTS), the CM incorrectly determines that it is not unsolicited only because the error code is not "3"' (which indicates "unsolicited").
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
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Symptoms The image description name may not be accurate when read by a Simple Network Management Protocol (SNMP) management station for uBR920 images.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
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Symptoms When interface bundling is not enabled on a Cisco uBR7200 series router, a cable modem (CM) can successfully ping the cable modem termination system (CMTS) interface (default route) and the secondary IP address of the CMTS cable modem interface 6/0:
interface Cable6/0
ip address 192.168.5.1 255.255.255.0 secondary
ip address 172.16.1.1 255.255.255.0However, when interface bundling is enabled on the Cisco uBR7200 series router, the CM can not ping the CMTS interfaces because the Address Resolution Protocol (ARP) does not function: the CM receives the ARP request and then sends a reply, but the CMTS never sees the reply, which causes a failure.
Conditions This symptom is observed when interface bundling is enabled on the Cisco uBR7200 series router.
Workaround There is no workaround.
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Symptoms Baseline Privacy Interface (BPI) does not function.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco 827 router cannot obtain the IP address from a Dynamic Host Configuration Protocol (DHCP) server through its ATM interface.
Conditions This symptom is observed when the Cisco 827 router is configured as a DHCP client.
Workaround Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the bridge virtual interface (BVI).
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Symptoms Address filter commands may be dropped on a Cisco Versatile Interface Processor 2-50 (VIP 2-50) and the following error message may be displayed:
%CBUS-3-CMDDROPPEDConditions This symptom is observed on a VIP 2-50 that is running Cisco IOS Release 12.1(6) or Release 12.2(1).
Workaround There is no workaround.
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Symptoms A Cisco 7500 series router reloads when a virtual-template is configured with Compressed Real-Time Traffic Protocol (CRTP) or Compressed TCP (CTCP).
Conditions This symptom is observed when distributed Cisco Express Switching (dCEF) is enabled and a virtual-template with CRTP or CTCP, or both, is configured on the Route Switch Processor (RSP).
Workaround Disable CEF and dCEF.
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Symptoms Stack Group Bidding Protocol (SGBP) may not function.
Conditions This symptom is observed when you use SGBP in conjunction with TACACS or RADIUS server directed requests. Directed requests are configured using the tacacs-server directed-request or the radius-server directed-request global configuration commands and can be used to strip the domain name from the user name.
Workaround There is no workaround.
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On a Cisco 2600 or 3600 series router that is running Cisco IOS Release 12.2(0.5) with performance monitoring (PM) inverse multiplexing over ATM (IMA) network modules, if there are two IMA groups configured, the second activated group causes the first activated group to drop all the outgoing packets. There is no workaround.
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Symptoms A Cisco 3600 router may reload constantly.
Conditions This symptom is observed when the Cisco 3600 router is configured with an ATM25 module and the ip route-cache flow interface configuration command is enabled.
Workaround There is no workaround.
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Symptoms Connection trunks configured between the voice ports on two Cisco routers may not be established.
Conditions This symptom is observed on T1 line channel-associated signaling (CAS) recEive and transMit (E&M) wink-start voice ports between a Cisco 7206VXR router that is configured with a Network Processing Engine 300 (NPE-300) and a PA-VXB-2TE1+ or a PA-VXC-2TE1+ port adapter and a Cisco 3640 router that is configured with a NM-HDV network module.
Workaround Use Cisco IOS Release 12.1(5)T on the Cisco 3640 router.
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A Cisco terminal gateway may increment the lost packet counter when dual tone multifrequency (DTMF) tones are sent. There is no workaround.
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Symptoms When a new call comes into a network access server (NAS) and the internal data structure for the call statistics is initialized, a message indicating a spurious memory access may be generated.
In the unusual situation when exceptions are enabled using the exception spurious interrupt 1 exception dump ip address exception protocol ftp global configuration command, the router may reload.
Conditions These symptoms are observed in Cisco IOS Release 12.2(1).
Workaround Do not enable exceptions when the router is providing service.
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Symptoms Show snasw commands do not function properly.
Conditions This symptom is observed on a Native Service Point (NSP).
Workaround Enter a command that is not a show snasw command after you have entered a show snasw command. Doing so, will enable the show snasw command to function properly. The second command does not even have to be a valid router command.
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Symptoms The authentication, authorization, and accounting (AAA) "fax" named authentication method list does not function.
Conditions This symptom is observed on a Cisco AS5300.
Workaround Use the "H.323" named authentication method list.
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Symptoms Memory management difficulties may occur and an access server may pause indefinitely.
Conditions This symptom is observed in Cisco IOS Release 12.2(5)XM
Workaround Reboot the access server.
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Symptoms The ip local-pool global configuration command does not function.
Conditions This symptom is observed on an uBR920 cable modem that is running Cisco IOS Release 12.1 T.
Workaround There is no workaround.
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Symptoms A Cisco gateway may send incorrect digital signal processor (DSP) playout parameters to the DSP, which disrupts audio.
Conditions This symptom is observed under a heavy load.
Workaround There is no workaround.
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Symptoms Packets are acted upon twice by the interface service policy.
Conditions This symptom is observed when the interface does not have an IP address configured and the subinterface/data-link connection identifier (DLCI)/permanent virtual circuit (PVC) on which packets are routed does not have a service policy configured.
Workaround There is no workaround.
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Symptoms When you use a 2 10/100 Fast Ethernet 2 WAN Card Slot Network Module (NM-2FE2W) and the Fast Ethernet port that is not manually configured for 100 full duplex, the show interface fastethernet number EXEC command (with 0/0 as the number) and the show controllers fastethernet number EXEC command (with 0/0 as the number) shows two different outputs regarding the operation mode. The show interface fastethernet EXEC command shows the port as 100 full, while the show controllers fastethernet EXEC command shows the port as 100 half duplex.
Conditions These symptoms are observed when you use auto sensing mode. The symptoms do not occur when you do not use auto sensing and when the port is configured manually.
Workaround There is no workaround.
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Symptoms The nas_port on RADIUS reports vendor-specific attributes (VSAs) on all calls on controller 0. This includes calls from controllers other than controller 0. This condition may cause incorrect Call Detail Records (CDR) records.
Conditions This symptom is observed on a Cisco AS5300.
Workaround There is no workaround.
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Multiprotocol Label Switching (MPLS) to IP packets are corrupted if they match an input or output Committed Access Rate (CAR) rule for which the action is to set the IP precedence field or the IP Differentiated Services Code Point (DSCP) field. There is no workaround.
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Symptoms When a High Availability (HA) switchover is performed on a Cisco Catalyst 6000 switch that has redundant Multilayer Switch Feature Cards (MSFC2) and HA enabled, the traffic recovers for a short period of time and then stops and never resumes on a WS-X6101 ATM module. The message "waiting for semaphore release" is displayed on the console of the ATM module until the module is reset.
Conditions This symptom is observed when the WS-X6101 ATM module is running Cisco IOS Release 12.1(5a)E3.
Workaround Upgrade to Cisco IOS Release 12.1(8)E.
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Symptoms The voip-incoming translaton-rule global configuration command-line interface (CLI) command does not perform the number translation on incoming Session Initiation Protocol (SIP) calls.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms The web console status does not display on a Cisco 6400 series platform.
Conditions This symptom is observed when half-size and full-size Node Route Processors (NRPs) or OC-12 cards are inserted in the same slot pair.
Workaround Pair half-size cards with half-size cards and full-size cards with full-size cards. Pair means: slot 1 with slot 2, slot 3 with slot 4, slot 5 with slot 6, and slot 7 with slot 8.
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Symptoms A tracebacks occurs when a DS0 group is removed from a controller.
Conditions This symptom is observed on a Cisco 3600 series router.
Workaround There is no workaround.
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Symptoms The CCH323_CT process may hold abnormally high memory.
Conditions This symptom is observed after a few days of load or stress testing on a Cisco AS5800 with about 420 E1-R2 voice calls terminated using G.729 and Media Server support for interactive voice response (IVR) scripting debit card applications.
Workaround There is no workaround.
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Symptoms An ISDN PRI line may not come up after a Cisco AS5400 reloads. The ISDN Layer 2 stays down.
Conditions This symptom is observed on a Cisco AS5400 that has an ISDN PRI line configured and is connected to a live PRI line.
Workaround Create a loopback on another PRI line to enable the live line to come up.
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Symptoms A Multiservice Route Processor 200 (MRP200) may reload.
Conditions This symptom is observed on a Multiservice Route Processor 200 (MRP200) that is configured with a packet voice or fax digital signal processor (DSP) module-20 (PVDM-20) (5 DSP modules) when you change the time-division multiplexing (TDM) clock configuration from two network clocks to one network clock using the dial-tdm-clock global configuration command.
Workaround There is no workaround.
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Symptoms When a crypto map is deleted while traffic that matches it is being sent, a router may reload. The crypto map may be deleted from the command-line interface (CLI), or if it is a dynamic crypto map, it may be deleted automatically.
Conditions This symptom is observed in Cisco IOS Release 12.2.
Workaround There is no workaround.
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Symptoms The modular quality of service command-line interface (MQC) set atm-clp policy-map class command does not mark the Cell Loss Priority (CLP) bit.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms User Datagram Protocol (UDP) traffic is dropped by a receiver, and UDP applications such as Simple Network Management Protocol (SNMP), voice, or Dynamic Host Configuration Protocol (DHCP) may fail.
Conditions This symptom is observed when an IP security (IPSec) is present.
Workaround There is no workaround.
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Resource Pool Manager Servers (RPMS) messages are not processed often enough, so messages are dropped because of queue overflow, which results in call count synchronization issues on the RPMS. There is no workaround.
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Symptoms A router that is configured with a 100-MB Flash card reloads upon attempting to use the Flash card, or when you enter the show flash EXEC command.
Conditions This symptom is observed when the router cannot read the 100-MB Flash card as slot 0 but only as disk 0.
Workaround Use a 20-MB Flash card.
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A Multiprotocol Label Switching (MPLS) router that has several Border Gateway Protocol (BGP) routes (Virtual Private Network (VPN) version 4 or IP version 4) may experience a memory leak if the route to the Border Gateway Protocol (BGP) neighbor flaps. The memory leak is about 100 bytes per BGP route for each route flap. An unusually large amount of memory is consumed by Tag Forwarding Information Base (TFIB) tag rewrites. The output of the show memory summary | include TFIB command indicates the presence of a memory leak. There is no workaround.
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Symptoms When you configure destination and incoming dial peer patterns, valid patterns such as "111#.T" are rejected as incorrect.
Conditions This symptom is observed in Cisco IOS Release 12.1(5)XM and Release 12.2.
Workaround Use a wildcard character such a "*."
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Symptoms An incorrect disconnect cause 63 (not implemented) may be set in a call detail record (CDR) stop record and shown in the output of the show call history voice record EXEC command.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms Calls may disconnect automatically 10 seconds after the initial seizure of a trunk.
Conditions This symptom is observed on a Cisco 2600 series or Cisco 3600 series router or a Cisco MC3810 with a T1 recEive and transMit (E&M) trunk that is configured with the signal immediate voice-port configuration command and that has the Digital Number Identification Service (DNIS) option enabled.
Workaround There is no workaround.
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Dynamic Network Address Translation (NAT) using the cable-modem dhcp-proxy {nat pool-name} cable interface command does not function correctly. IP addresses or subnet masks and default gateways are not assigned correctly, if at all. After the command is entered, the address assigned to the NAT pool does not respond to Address Resolution Protocol (ARP). The pool (IP address) that is created is from the cable modem scope rather than the customer premises equipment (CPE) scope. This behavior causes an unroutable IP address to be assigned to the NAT pool. There is no workaround.
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Line cards on a Cisco 12000 Internet Router that is running Cisco IOS Release 12.0(14.6)S1 and that has Multiprotocol Label Switching (MPLS) configured may reload in a stress environment. When one line card that has an interface on which MPLS is configured is reloaded manually, other line cards may experience a bus error. The router displays the following message on the console or in the log:
%LCINFO-3-CRASH:Line card in slot <slot num> crashedWorkaround: Do not include a static recursive route to a Border Gateway Protocol (BGP) peer router.
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Symptoms Excessive CPU utilization may occur on a router because of a large number of alignment corrections, as displayed in the output of the show alignment EXEC command.
Conditions This symptom is observed on a router that is configured for Layer 2 Tunneling Protocol (L2TP).
Workaround There is no workaround.
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Symptoms After you enable distributed Cisco Express Switching (dCEF) on a multilink interface, a the Route Switch Processor (RSP) reloads.
Conditions This symptom is observed when IP header compression (Compressed Real-Time Traffic Protocol [CRTP] or Compressed TCP [CTCP]) is not configured.
Workaround Configure IP header compression on the multilink interface.
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Symptoms A caller from the Public Switched Telephone Network (PSTN) may hear a short burst of loud noise when the user on the Voice over IP (VoIP) side answers the call.
Conditions This symptom is observed when you use a VIC-2FXO-M1 interface card with caller ID enabled.
Workaround Disable the caller ID functionality.
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Symptoms Packets are intercepted by TCP but not directed to the cache engine, as they should.
Conditions This symptom is observed on a Cisco Catalyst 6000 series switch when the Web Cache Communication Protocol (WCCP), Layer 2 redirection mode, and TCP intercept mode is enabled.
Workaround There is no workaround.
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Symptoms A Voice over Frame Relay (VoFR) call fails with a cause code "0xAC."
Conditions This symptom is observed when you attempt to make a VoFR call that originates on a Cisco MC3810 that is running Cisco IOS Release 12.1(5)T with the G.729ar8 codec and you attempt to terminate the call on a Cisco 1750 router that is running Cisco IOS Release 12.1(5)T. The Cisco 1750 router cannot negotiate successfully with the G.729ar8 codec.
Workaround Run the G.729r8 codec on the Cisco MC3810, although doing so takes up a full digital signal processor (DSP).
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A timing issue occurs when a new fax call comes into an originating gateway, and the terminating gateway has not finished a "clear down" from the fax. This situation occurs only when you use a trunk connection and does not occur when you use a switched connection. There is no workaround.
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A race condition may occur when a CONNECT message immediately follows an ALERTING message so that ringback never ceases even after the call is connected. This situation does not happen if there is enough time between the CONNECT message and the ALERTING message.
Workaround: Remove the voice call send-alert global configuration command so that a PROGRESS message is sent instead of an ALERTING message.
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Symptoms Querying Simple Network Management Protocol (SNMP) variables regarding compression statistics may cause a Cisco 3600 series router to reload.
Conditions This symptom is observed when a Data Compression Advanced Integration Module (AIM) is installed in slot 1 of a Cisco 3660 router.
Workaround Move the Data Compression AIM to slot 0.
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Symptoms A call between two Cisco routers that are configured to use the Open Settlement Protocol (OSP) is disconnected with a disconnect cause of "0x0" (uninitialized) or "0x2C" (no_req_circuit), which results in the call being disconnected and Call Detail Records (CDRs) being generated. However, the OSP transaction remains. If the transaction counter increases to the limit of 2000, no more calls are processed by the gateway.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Use the shutdown command followed by the no shutdown command inside the settlement configuration. This workaround resets the counter to 0.
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Symptoms When you perform an online insertion and removal (OIR) of a network module, the router displays some tracebacks on removal and reloads on insertion of the network module.
Conditions This symptom is observed on a Cisco 3600 series router when T1 interfaces on a NM-2W, NM-1FE1R-2W, or NM-2FE-2W network module are configured for channel groups.
Workaround There is no workaround.
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Symptoms A Cisco router that is running Cisco IOS Release 12.2(0.5b) with the DistributedDirector image may reload.
Conditions This symptom is observed on a Cisco 4500 series router.
Workaround Enable the no ip director cache command
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With generic routing encapsulation (GRE) over IP Security (IPSec) configured between two routers, GRE packets are sent in the clear instead of being dropped when there is no IPSec security association (SA) established. This situation is a security concern. There is no workaround.
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Symptoms A router reloads.
Conditions This symptom is observed when a proxy receives a call and is not registered with a gatekeeper, or the registration is lost.
Workaround There is no workaround.
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Symptoms You cannot access a Cisco 1700 series router via Telnet.
Conditions This symptom is observed once you install a Virtual Private Network (VPN) module.
Workaround There is no workaround.
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Symptoms Web Cache Communication Protocol (WCCP) Cisco Express Forwarding (CEF) packet redirection is not supported on a Cisco 7100 series router. When CEF is enabled with WCCP, no packets are redirected.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Disable CEF, or move WCCP redirection to a different router.
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Symptoms When you enable the access list option of the Mobile IP Home Agent feature on a virtual template using the ip mobile foreign-service home-access acl interface configuration command, the Packet Data Serving Node (PDSN) reloads when a session is opened and closed.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(3)XS with a PDSN.
Workaround Disable the home-access acl option in the virtual template.
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A Cisco AS5800 series Router shelf reloads intermittently when the show modem EXEC command line interface (CLI) is executed. There is no workaround.
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Symptoms A service policy is accepted when it should not, and a Route Switch Processor (RSP) may reload.
Conditions This symptom is observed with a very specific type of service policy. The policy must have priority enabled in the first class, and the kbps assigned to the priority class must be exactly equal to the interface or permanent virtual circuit (PVC) rate. In such cases, this policy should be denied as an invalid policy. Instead, the policy is accepted, and if subsequent classes try to allocate bandwidth by entering the bandwidth interface configuration command, the RSP reloads. Attaching a policy of this type should be avoided.
Workaround There is no workaround.
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Symptoms The output state may be stuck on some member links of a multilink bundle.
Conditions This symptom is observed when the bundle is flapped under heavy traffic.
Workaround There is no workaround.
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Symptoms A Cisco 3600 series router may reload while running Inter-Switch Link (ISL) and IP Security (IPSec) with Authenticated Header (AH), Encapsulating Security Protocol (ESP) and IP compression on a Fast Ethernet port.
Conditions This symptom is observed on a Cisco 3600 series router that is running Cisco IOS Release 12.1(6) or Release 12.0 T.
Workaround Use 802.1q encapsulation on the port, or reduce the number of transforms on the IPSec tunnel.
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Symptoms A Gigabit Ethernet interface on a Cisco 7200 series router may stop transmitting packets. The output queue remains stuck at 40/40.
Conditions This symptom is observed under very heavy load conditions.
Workaround Enter the clear interface gigabitethernet number privileged EXEC command or enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the affected interface.
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Symptoms The Address Resolution Protocol (ARP) entry for an active virtual IP address may get overwritten when a network transition occurs.
Conditions This symptom is observed when the burned-in address (BIA) feature or configurable MAC addresses are used. Hosts send packets to a MAC address that is not listened for by the active router. This situation is especially noticeable on Bridge Group Virtual Interface (BVI) interfaces but may also occur on Ethernet and Token Ring interfaces.
Workaround There is no workaround.
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Symptoms A Cisco Versatile Interface Processor 2-50 (VIP2-50) or VIP4-80 may reload when it has a Multi-Channel T3 port adapter (PA-MC-T3) in one slot of the VIP with any other PA in another slot of the VIP and when traffic is sent through the PA-MC-T3 close to the line rate.
Conditions This symptom is observed with two PAs in a VIP4-80 with distributed Multilink Point-to-Point protocol (MLPPP).
Workaround Do not send traffic close to the line rate.
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Symptoms A Cisco router that is running Hot Standby Router Protocol (HSRP) may reload with a memory corruption.
Conditions This symptom is observed when changes are made to the HSRP configuration.
Workaround There is no workaround.
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A Cisco AS5300 universal access server that is running Cisco IOS Release 12.1(5)T may reload repeatedly with the following error message:
System returned to ROM by bus error at PC 0x0, address 0x0The following alignment errors are also detected:
BKK: %ALIGN-3-SPURIOUS: Spurious memory access made at 0x60B82FC8 reading 0x48There is no workaround.
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Symptoms Packets are not forwarded on the shortcut when they are destined to IP addresses on which a Multiprotocol over ATM (MPOA) client is bound.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco router reloads because of a a signal trap (SIGTRAP) exception.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A 1500-byte IP packet with three Multiprotocol Label Switching (MPLS) labels cannot be received on a Fast Ethernet or Gigabit Ethernet interface because the packet is counted as a giant packet and dropped
Conditions This symptom is observed on a Cisco 7200 series and Cisco 7500 series router.
Workaround There is no workaround.
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Symptoms When a gateway handles signal-only calls and when there is no Real-Time Transport Protocol (RTP) or when a Control Protocol (RTCP) session is needed, the RTP or RTCP ports are reserved, and the RTCP socket are created. These ports and sockets are not deallocated at the end of the call, resulting in RTCP sockets leaks or depletion. Once the leak or depletion occurs, the normal calls that need RTP or RTCP sockets are not available, and the calls have no audio.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
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Symptoms The wrong power supply type is returned as a result of a ciscoEnvMonSupplySource Simple Network Management Protocol (SNMP) query.
Conditions This symptom is observed on a Cisco 3660 router.
Workaround There is no workaround.
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Symptoms A router ignores any configured progress_ind dial-peer configuration commands.
Conditions This symptom is observed when a Cisco router receives a progress indicator information element (IE) with a reserved value (not a standard value as found in the Q.931 specification).
Workaround There is no workaround.
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If you test Q Signaling (QSIG) supported services, a Cisco router reloads while forwarding a call. There is no workaround.
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Symptoms The Cisco IOS ubr7200-ik8s.mz and ubr7200-ik8st.mz images do not build.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms Some ports may get stuck on a Cisco AS5850.
Conditions This symptom is observed under certain load stress conditions with Resource Management and Cisco Resource Pool Manager Server (RPMS) configured.
Workaround There is no workaround.
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Symptoms A memory leak may occur on a Cisco LS1010 Lightstream ATM switch or a Cisco Catalyst 8540 switch whenever access is made to some Private Network-Network Interface (PNNI) tables.
Conditions This symptom is observed on a Cisco LS1010 Lightstream ATM switch or a Cisco Catalyst 8540 switch that is running Cisco IOS Release 12.0(13)W5(19) or an earlier release when used with a Network Management System (NMS) that is running Simple Network Management Protocol (SNMP).
Workaround Use a command-line interface (CLI) for determining any PNNI information and disable the NMS polling of PNNI tables.
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For Cisco IOS Release 12.1(5)T Route Switch Processor (RSP) images, a two-port T1/E1 High-Capacity Enhanced Digital Voice Port Adapter (PA-VXC-2TE1) or a two-port T1/E1 Moderate-Capacity Enhanced Digital Voice Port Adapter (PA-VXB-2TE1) that is plugged into slot 6 or a higher number slot, the pri-group controller configuration command does not generate a voice-port configuration entry or a correct voice-port entry. The output of the show voice port privileged EXEC command also gives incorrect information.
Workaround: Move the voice port adapter to slots 1-5.
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If you perform an online insertion and removal (OIR) on a two-port T1/E1 High-Capacity Enhanced Digital Voice Port Adapter (PA-VXC-2TE1+) or a 2 Port T1/E1 Moderate-Capacity Enhanced Digital Voice Port Adapter (PA-VXB-2TE1+) from a Cisco 7200 series router and insert an eight-port multiservice interchange (MIX) multichannel T1/E1 Port Adapter (PA-MCX-8TE1), a PA-MCX-4TE1 port adapter, or a PA-MCX-2TE1 port adapter, the route may reload.
Workaround: Do not swap a PA-VXC-2TE1+ or PA-VXB-2TE1+ with a PA-MCX-x8TE1 port adapter.
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Symptoms When an R2-to-Voice over IP (VoIP) call is placed and a user-busy cause code (cause value 17 or hex 11) is returned by the VoIP leg, the proper B register (B3) signal is not returned on the R2 trunk.
Conditions This symptom is observed on a Cisco 2600 series or Cisco 3600 series router that is running Cisco IOS Release 12.2(2.3) or an earlier release when the router is configured for E1 multifrequency controlled R2 (MFCR2) trunks.
Workaround There is no workaround.
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When you use the shutdown command on a settlement during heavy call volume, a transaction handle may become temporarily invalid. Subsequent interactive voice response (IVR) call setup on the same transaction may cause the gateway to reload. There is no workaround.
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Symptoms An incorrect sysobject ID is returned.
Conditions This symptom is observed when you query a Telco image of a Cisco 3600 router using Simple Network Management Protocol (SNMP).
Workaround There is no workaround.
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Symptoms A Cisco router may reload during the bootup process.
Conditions This symptom is observed when a syslog server and syslog source interface have been defined before the source interface has been parsed and the configuration of the router is directly written from TFTP to non-volatile RAM (NVRAM) memory or you upgrade from Cisco IOS Release 12.0 to Release 12.1 or Release 12.2.
Workaround Place the syslog server and syslog source interface configurations after the source interface itself. To do this, you must edit the configuration offline, copy it to NVRAM memory, and then reboot the router.
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Symptoms A Cisco 3640 router with an NM-4T network module that is connected back-to-back through a serial interface to another Cisco 3640 router with another NM-4T network module starts to drop packets in the input queue of the DCE side of the serial interface.
The number of packets dropped in the input queue coincides exactly with the number of packets marked as "no buffer" in the output of the show interfaces serial interface privileged EXEC command. Throttles and input errors are also reported on the serial interface. The number of input errors coincides with the number of overruns. This situation does not affect the DTE side of the connection.
Conditions This symptom is observed after approximately two weeks of normal operation.
Workaround Reload the router. Momentarily shutting down the interface does not work.
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When you use a Cisco Label Switch Controller (LSC) as an edge Label Switch Routers (LSR) in a particular configuration, some XtagATM interfaces are not operational. There are no Tag Distribution Protocol (TDP) neighbor relationships over the XtagATM interfaces. This situation only occurs when you use a PA-A3 port adapter ATM card as the Virtual Switch Interface (VSI).
Workaround: Use the shut command followed by the no shut command on both sides of the XtagATM connection.
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Symptoms An input police function that is configured with the modular quality of service command-line interface (MQC) fails to drop Multiprotocol Label Switching (MPLS) packets when configured to do so.
In addition, packets are getting punted to the Route Switch Processor (RSP) instead of being discarded by the Versatile Interface Processor (VIP), which results in the RSP performing the input police function again and attendant police accounting problems.
If you configure an input committed access rate (CAR) rule via the rate-limit interface configuration command, the same symptoms occur.
Conditions These symptoms are observed on a Cisco 7500 series router that is configured with a VIP interface performing distributed switching of MPLS packets.
Workaround There is no workaround.
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Symptoms When a back-to-back sweep ping is performed on a Cisco 7500 series router that is configured with a Route Switch Processor (RSP), the packets that arrive at the RSP may be corrupted and a ping failure may occur because of an Internet Control Message Protocol (ICMP) checksum error. When this condition occurs, packets can still be switched in the path that is using distributed Cisco Express Forwarding (dCEF).
Conditions This symptom is observed for links that have distributed Link Fragmentation and Interleaving (dLFI) or distributed Multilink PPP (dMLP) configured.
Workaround There is no workaround.
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Symptoms In a Multiprotocol Label Switching (MPLS) or Virtual Private Network (VPN) environment, there is no support for forwarding data to cable interfaces. Packets forwarded from the MPLS or VPN core to the cable interfaces which are in a VPN routing or forwarding instance (VRF) are silently dropped.
Conditions This symptom is observed on a Cisco uBR7200 series router.
Workaround Configure a summary-only route in Border Gateway Protocol (BGP) and suppress advertisement of any more specific routes pointing to such an interface.
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Symptoms A Cisco voice gateway may reload when a call is disconnected.
Conditions This symptom is observed after performing a valid call transfer.
Workaround There is no workaround.
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Symptoms An approximately 13-percent packet drop may occur with Internet Mix (IMIX) traffic.
Conditions This symptom is observed on a Cisco router that is running distributed Multilink PPP (dMLP) when traffic is moving at the line rate.
Workaround There is no workaround.
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Symptoms A Cisco 1700 series router reloads during an autoinstall operation. Duplicate address error messages are displayed just before the router reloads.
Conditions This symptom is observed when a Cisco 1700 series router is reloaded without a startup configuration. This situation occurs because the Dynamic Host Configuration Protocol (DHCP) client code attempts to dereference a NULL pointer when the offered address from the DHCP server is a duplicate of an address that is assigned elsewhere in the network.
Workaround There is no workaround.
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Symptoms Polling CmCpeTable causes a Cisco router CPU usage to go up to 80 to 96 percent for 3 to 5 minutes on a uBR7246 router that is running Cisco IOS Release 12.0(14)SC compared to 12 percent when the router is running Cisco IOS Release 12.0(11).
Conditions This symptom occurs because in Cisco IOS Release 12.0(14)SC, for every Simple Network Management Protocol (SNMP) request for cdxCmCpeEntry, a new sorted cable modem (CM) or customer premises equipment (CPE) list is generated in order for the router to search for the right entry to return.
Workaround Use another method to find out the CM or CPE information.
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A Cisco AS5300 series universal access server that is running Cisco IOS Release 12.1(6.3) with heavy traffic and Resource Pool Manager Servers (RPMS) enabled may pause indefinitely. There is no workaround.
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Symptoms It is not possible for a router to boot, format, read, or write from an Advanced Technology Attachment (ATA) vendor-specific card. The symptoms that are observed may be intermittent and random and typically appear in one of two forms. When Cisco IOS software is used, the message "ATA_Status time out waiting for x" where x is a digit may be displayed. When booting from the ROM monitor (ROMmon) mode, a "loadprog" error message or the "ATA_Status time out waiting for x" message may be displayed.
Conditions These symptoms are observed on a router that is using a bad ATA vendor-specific card under a variety of conditions in Cisco IOS Release 12.1(5.0.4)PI2, Release 12.1(5.1), Release 12.1(5.1)PI2, Release 12.1(5.3)T, Release 12.1(5.6)E, Release 12.1(5.6)EC, Release 12.1(6)E1, and later releases. This symptom affects 48 MB and 128 MB cards from a specific vendor.
Workaround Replace the bad ATA vendor-specific card with one that operates in the normal response time.
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Symptoms A Gateway GPRS Support Node (GGSN) reloads and produces a stack trace with an infinite loop through the GPRS Tunneling Protocol (GTP) software.
Conditions These symptoms are observed on R1.4 and later versions of the General Packet Radio Service (GPRS) software in Cisco IOS software and impacts all process switching, fast switching and Cisco Express Forwarding (CEF) switching.
The symptoms occur when the Serving GPRS Support Node (SGSN) sends a request to create a Packet Data Protocol (PDP) context or a request to update a PDP context to the GGSN with a flawed GPRS Support Node (GSN) address in any of the GSN address Information Elements for signaling or data. Such an address is considered flawed if there is already a next-hop route for this same address on the GGSN pointing to the GTP virtual-access interface. After this flawed address is installed and used for returning packets to the SGSN, these packets are sent through the GTP virtual-access interface an infinite number of times, causing the GGSN to reload.
Workaround There is no workaround.
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Symptoms A bus error exception occurs and the router reloads.
Conditions This symptom is observed when a request to create a Packet Data Protocol (PDP) context requires a dynamic address and RADIUS authentication. When the RADIUS server returns with a negative response before the Dynamic Host Configuration Protocol (DHCP) returns with an address, the router reloads.
Workaround There is no workaround.
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Symptoms A session cannot be established.
Conditions This symptom is observed when a Cisco router that is running Systems Network Architecture Switching Services (SNASw) adds "CV 0x2A" to the activate logical unit (ACTLU) positive response that is forwarded to a host, indicating a session takeover.
Workaround There is no workaround.
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Symptoms A Cisco 7200 series router does not terminate data on a channel group with a 64K data connection.
Conditions This symptom is observed when the Cisco 7200 series router is configured with channel-associated signaling (CAS) for voice and when a channel group and a time-division multiplexing (TDM) group are configured on the same T1 controller.
Workaround There is no workaround.
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Symptoms The set mpls experimental policy-map configuration command does not function in a service policy.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A Cisco router pauses indefinitely when you run header compression.
Conditions This symptom is observed when you use Real-Time Transport Protocol (RTP) and configure header compression by using the ip rtp header-compression interface configuration command.
Workaround Disable header compression by entering the no ip rtp header-compression interface configuration command.
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Symptoms After a router reloads, an H.323 voice gateway may get registered with a gatekeeper that is different from the gatekeeper that it was registered with before the router reloaded, and the command-line interface (CLI) that specifies the gatekeeper IP address under the interface may disappear.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround After the router has reloaded, add the gatekeeper configuration command that is listed in the startup configuration to the running configuration.
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Symptoms The output of the show atm pvc privileged EXEC command does not correlate with packet output drop values from the show interfaces privileged EXEC command.
Conditions This symptom is observed when permanent virtual circuit (PVC) queueing is configured on an ATM interface.
Workaround Enter the show queueing interface atm command to display PVC drops in the matching Layer 3 queue.
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Symptoms A Cisco 4500 series or Cisco 7500 series router immediately displays a traceback message in the managed timer after you configure Cisco Express Forwarding (CEF) in global configuration mode.
On a Cisco 3640 router or a Cisco 4500 series, Cisco 7200 series, or Cisco 7500 series router that is configured with CEF, a spurious memory access may occur in the Forwarding Information Base (FIB) feature switch when a lot of traffic passes through the Cisco Appliance Services Architecture (CASA).
Conditions These symptoms are observed when CEF is configured.
Workaround There is no workaround.
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Symptoms An output committed access rate (CAR) rule for packets that are switched from Mulitprotocol Label Switching to IP cannot mark the IP precedence or IP differentiated services code point (DSCP) values.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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If you use the shutdown command followed by the no shutdown on the ATM interface of a Cisco 3660 router, the service-policy output command is removed from the permanent virtual circuit (PVC) of the subinterface. You cannot reconfigure the service policy on the subinterface.
Workaround: Delete the policy map; then reconfigure and reattach the policy map on the PVC of the subinterface.
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Symptoms A Cisco AS5300 may fail an egress Continuity Test (COT).
Conditions This symptom is observed in the transponder and loopback modes.
Workaround There is no workaround.
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Upon a failover of a redundant Network Switch Processor (NSP), some PVCs on the Network Route Processor (NRP) might stop transmitting cells over the ATM interface.
Workaround: Issue a shut command followed by a no shut command on the subinterface (not on the main interface).
Alternate workaround: Remove and reapply the PVCs (using CLI commands) and reboot the NRP.
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Under stress scenarios in which a high number (>1000) of Tag Virtual Circuits (TVCs) is set up on an interface, some TVCs might not be set up successfully and the following message is printed:
%TCATM-4-RESOURCE_LIMIT: VC resource exhausted (for the interface that is used)There is no workaround.
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Symptoms Multiprotocol Label Switching (MPLS) traffic cannot be forwarded over a Generic Routing Encapsulation (GRE) tunnel. The traffic is dropped at the imposition router.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms Cisco Express Forwarding (CEF) may incorrectly delete a prefix that is marked as "is subnetted" from its forwarding table.
Conditions This symptom is observed when the routing process modifies a prefix marked as "is subnetted' and if there is a matching subnetted prefix in the forwarding table.
Workaround There is no workaround.
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Symptoms Some set actions disappear from a service policy when you reload the router.
Conditions This symptom is observed when you use modular quality of service command-line interface (MQC).
Workaround Reenter the commands after the router has reloaded.
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Symptoms A Versatile Interface Processor (VIP) on a Cisco 7500/RSP series router that is running Cisco IOS Release 12.1(5a)E4 may reload with the following error message:
%ALIGN-1-FATAL: Illegal access to a low addressConditions This symptom is observed on Frame-Relay interfaces that have distributed quality of service (QoS) enabled.
Workaround There is no workaround.
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Symptoms Per-user compression attributes are not applied to ISDN users.
Conditions This symptom is observed even when virtual profiles are enabled.
Workaround There is no workaround.
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When you use the isdn incoming-voice {voice} interface configuration command, an information message is not passed from end to end in an active state for the basic-net3 switch type. Optional information elements (IEs) (KEYPAD, DISPLAY, cause) are not passed in an active state for primary-net5 switch type. There is no workaround.
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An Open Connect Client physical unit 2.0 (PU2.0) station rejects Systems Network Architecture Switching Services (SNASw) segment interleaving, returning a sense code of 80070000. There is no workaround.
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The configuration of the isdn negotiate-bchan [resend-setup] interface configuration command on the serial interface (D-channel) of an Non-Facility Associated Signaling (NFAS)/ Redundant Link Manager (RLM) group in a Thundervoice configuration will cause multiple setups to be sent for a call in the event of a Continuity Testing (COT) failure. This may cause the Cisco SC2200 Signaling Controller and the gateway to associate different setup messages with the call and may subsequently cause the call to fail. There is no workaround.
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On a Cisco router that is running Cisco IOS releases later than Release 12.1(3a)T4 (including Release 12.1(3a)XI), progress indicators are not passed end-to-end. Among other things, this situation means that the calling party does not hear progress tones from the terminating switch, but from the originating gateway router. There is no workaround.
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Symptoms If a Voice over IP (VoIP) leg of a call is not established while RADIUS accounting is enabled, the Telephony Stop record that is generated contains the collected pin number as the username value. This value is different from the value of the username in a Telephony Stop record if the VoIP leg of a call is established. If the VoIP leg of a call is established, the username value is the calling number.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms A virtual interface resets when a Simple Network Management Protocol (SNMP) query for interface information causes a bus error exception, and the following error message is generated:
%LINK-3-UPDOWN: Interface Virtual-Access1, changed = state to up
%LINK-3-UPDOWN: Interface Virtual-Access2, changed = state to up
-Traceback=3D 607FBE24 607EDCE8 60345AF0 6036E1B0 6036C0B8 6036C1CC = 6036C358 602A9 274 602A9260
*** System received a Bus Error exception ***
signal=3D 0xa, code=3D 0x10, context=3D 0x60eb7020
PC =3D 0x602ea33c, Cause =3D 0x4820, Status Reg =3D 0x34008002Conditions This symptom is observed on a Cisco 6400 series Node Route Processor (NRP).
Workaround There is no workaround.
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Symptoms A Cisco Transaction Connection (CTRC)/Systems Network Architecture (SNA) switch router may reload.
Conditions This symptom is observed after the router fails to connect to the host.
Workaround There is no workaround.
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Symptoms A Cisco 6400 series Node Route Processor (NRP) loses the Open Shortest Path First (OSPF)-neighbor relationship with a Cisco 6400 series Node Switch Processor (NSP), and XtagATM interfaces are down.
Conditions These symptoms are observed in a configuration that uses the NSP as a Label Switch Router (LSR) and the NRP as a Label Edge Router (LER), if the NSP is reloaded while the NRP is up.
These symptoms disappear when the NRP is reloaded subsequently. Occasionally, when you reload the NSP, the NRP reloads unexpectedly
Workaround Reload the NRPs after a you have reloaded the NSP.
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Symptoms On a Cisco ICS 7750 Integrated Communication System Multiservice Route Processor (MRP) 200, the system may reload when you use the tdm clock global configuration command to change the time-division multiplexing (TDM) clock configuration from using one clock to ping two network clocks.
Conditions This symptom is observed when a Digital Signal Processor (DSP) group change from 1 to 2 occurs immediately after a 2-to-1 change.
Workaround There is no workaround.
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Symptoms A Gateway GPRS Support Node (GGSN) reloads when it receives a series of Packet Data Protocol (PDP) requests without IP Control Protocol (IPCP) information.
Conditions This symptom is observed after the GGSN has first successfully sent a request to create a PDP using RADIUS authentication.
Workaround There is no workaround.
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When you configure a 2-Port RJ-48 Multiflex Trunk - E1 with Drop and Insert Voice WAN Interface Card (VWIC-2MFT-E1-DI) using the channel-group group-number {unframed} controller configuration command using 0 as the group-number, the E1 controller may show line code violations depending on the amount of 0 bits transferred over the unframed E1 link. In some circumstances, the controller flaps and displays the following output:
2d06h: %LINK-5-CHANGED: Interface Serial0/0:1, changed state to reset
2d06h: %CONTROLLER-5-UPDOWN: Controller E1 0/0, changed state to up
2d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:1, changed state to down
2d06h: %CONTROLLER-5-UPDOWN: Controller E1 0/0, changed state to down (10 SES)
2d06h: %CONTROLLER-5-UPDOWN: Controller E1 0/0, changed state to up
2d06h: %LINK-3-UPDOWN: Interface Serial0/0:1, changed state to up
2d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:1, changed state to upThere is no workaround.
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Symptoms A 324-port modem card (UP324) may not bootup gracefully, or the digital signal processors (DSPs) may get stuck in the D—Download in Progress state.
Conditions This symptom is observed on a Cisco AS5800.
Workaround Online insertion and removal of the modem card may cause the modem card to boot up correctly. If that does not improve the situation, reload the network access server (NAS).
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A Cisco router does not remove the statement from the running configuration when the no alias static gatekeeper configuration command is issued.
Workaround: Use the write erase command.
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Symptoms When shortcuts are terminated on a Cisco router that is acting as a Multiprotocol over ATM server (MPS) and a Multiprotocol over ATM client (MPC) on the terminating interface, extensions may be missing in the Next Hop Resolution Protocol (NHRP) resolution reply and in the Multiprotocol over ATM (MPOA) resolution reply.
Conditions This symptom is observed on but not limited to a Cisco 4500 series router.
Workaround There is no workaround.
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A Cisco router experiences 100 percent CPU usage when you use the ip rtp header-compression [iphc-format] interface configuration command on 4T/MC68360 interfaces.
Workaround: Disable header compression using the no ip rtp header-compression interface configuration command.
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Symptoms A router reloads with following tracebacks:
602C3BAC 60463BDC 60466120 6026A3FC 60277F3C 602D4704 602D46F0Conditions This symptom is observed when you delete an IP Virtual Private Network (VPN) routing/ forwarding entry from the configuration file.
Workaround There is no workaround.
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Symptoms A physical unit (PU) gets stuck in the "Pend ACTPU" state.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Reload the router, or stop and start the Systems Network Architecture Switching Services (SNASw) process in the router.
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When a Cisco uBR7200 broadband router is configured to do interface bundling (Dynamic Host Configuration Protocol [DHCP] Option 82) with the ip dhcp relay information option global configuration command, the cable modems on the slave interfaces may fail to come on line.
Workaround: Remove the ip dhcp relay information option global configuration command from the configuration.
Alternate workaround: Disable interface bundling.
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A Cisco AS5300 series universal access server that is running Cisco IOS Release 12.2 and that is configured with the Open Settlement Protocol (OSP) feature may hold too much memory in the OSP_HTTP and Tool Command Language (TCL) application processes. The memory is not released, which may cause the router to run out of memory and pause indefinitely. The memory leak occurs over time, depending on call volume. There is no workaround.
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H.323 FastStart calls fail to associate with a media stream. There is no workaround.
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An artificial limit of 32 k of NVRAM memory on c4gwy cards is not compatible with Cisco IOS releases that use cards requiring 256 k of NVRAM memory. The configuration is preserved when the router image is changed to a Cisco IOS image that contains the fix for this caveat. However, if you go back to the original image, the configuration is lost.
Workaround: Use the Cisco IOS release that contains the fix for this caveat.
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When an originating gateway cannot successfully set up a call with Open Settlement Protocol (OSP) enabled, the gateway may indicate that there are two NULL OSP call detail records (CDRs) on the OSP server associated with that call. There is no workaround.
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Symptoms A Cisco 7120 router reloads when you configure the lifetime of IP security (IPSec) security associations (SAs) for a very low value like 2560 kilobytes.
Conditions This symptom is observed when there is a heavy traffic load in the IPSec tunnel.
Workaround There is no workaround.
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Symptoms An alignment error may occur on a Versatile Interface Processor (VIP).
Conditions This symptom is observed when you enable output committed access rate (CAR) or output police on an FDDI interface.
Workaround Remove the output CAR or output police.
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Spurious accesses may occur on a Cisco 3640 router that is running Cisco IOS Release 12.2(0.5c) when you use the show voice call [summary] privileged EXEC command. There is no workaround.
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Symptoms When a random-detect command is enabled, a ping fails.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Disable the random-detect command.
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On a Cisco router that is running Cisco IOS Release 12.2(05b) and that has R2 Signaling, Tool Command Language (TCL) returns a value of 1 when a dial peer router is not configured. There is no workaround.
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A High-Speed Serial Interface (HSSI) of a Versatile Interface Processor (VIP) does not update changes to the maximum transmission unit (MTU) size made on a Cisco Route Switch Processor (RSP) under the respective HSSI.
Workaround: Manually change the MTU size under the VIP console. This workaround is not permanent.
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A Cisco router that is configured for Frame Relay Traffic Shaping (FRTS), Low Latency Queueing (LLQ) and IP Real-Time Transit Protocol (RTP) header compression may see drops in the output priority queue for voice when the bandwidth configured for the voice queue is less than the uncompressed voice bandwidth. This situation does not occur if you use the frame-relay ip rtp priority map-class configuration command instead of LLQ.
Workaround: Use the frame-relay ip rtp priority map-class configuration command instead of LLQ.
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Symptoms The call duration in a RADIUS authentication, authorization, and accounting (AAA) record mismatches the call duration in the disengage request (DRQ) message that is sent from a gateway to a gatekeeper. The value in the DRQ message is one second longer than the value in the AAA record.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
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Symptoms The Fax Relay feature is not used for a fax call, and the fax call uses the Modem Passthrough feature.
Conditions This symptom is observed when a router is configured for both the Fax Relay feature and the Modem Passthrough feature.
Workaround There is no workaround.
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Symptoms A Cisco 7500 series router that is running distributed Multilink PPP (dMLP) may reload.
Conditions This symptom is observed when two Cisco 7500 series routers are connected back-to-back with one router running dMLP, the other router running MLP (that is, distributed switching is turned off), and fragmentation is enabled on the router that is running MLP
Workaround Disable fragmentation on the router that is running MLP.
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If a Virtual Private Network (VPN) routing/forwarding instance (VRF) route points to a next hop that is also resolved by a recursive lookup, such as a multihop external Border Gateway Protocol (eBGP) session, a tag is incorrectly imposed over the Provider Edge-to-Customer Edge (PE-to-CE) link. Consequently, traffic does not pass.
Workaround: Change the eBGP session to use IP addresses rather than Multihop eBGP.
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A Voice over IP (VoIP) gateway that is running Cisco IOS Release 12.1(3a)XI5 or Release 12.1(5)T and that has FastStart enabled may experience high CPU utilization in the H.323 process because Real-Time Transport Protocol (RTP) sessions are created more than once for the same call and the previous call is not closed, which results in the existing RTP session being overwritten. On an originating gateway, this situation causes the RTP Control Protocol (RTCP) socket to leak.
Workaround: Use SlowStart instead of FastStart.
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A Cisco AS5800 access server that is running the testing image based on Cisco IOS Release 12.1(3a)T5 with NextPort card 0.6.85.0 may not detect the incoming Point-to-Point Protocol (PPP) Link Control Protocol (LCP) packets from the users. After around 40 seconds, the router will disconnect the user due to PPP timeout. There is no workaround.
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Symptoms A Cisco AS5300 reloads.
Conditions This symptom is observed when you attempt to configure the pri-group timeslot 1-24 service mgcp command.
Workaround There is no workaround.
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Symptoms After establishment of IP Security (IPSec) security associations (SAs), the remaining lifetimes of IPSec SAs may differ significantly, which may cause loss of encrypted connectivity.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Lower the lifetimes of the IPSec and Internet Security Association and Key Management Protocol (ISAKMP) SAs. This workaround may minimize the impact for some environments but does not fully solve the issue and may include undesirable consequences.
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The Cisco Express Forwarding (CEF) table for a Cisco 12000 Internet Router line card might not synchronize with the Gigabit Route Processor (GRP) on a Cisco 12000 Internet router that is running Cisco IOS Release 12.0(13)S2.
This situation has been observed when a Packet-over-SONET (POS) line card did not have a /32 receive adjacency for a Gigabit Ethernet module on the same Cisco 12000 Internet router. The output of the show cef interface gigabit 9/0 command revealed that IP processing was disabled on gigabit interface 9/0 and that there were no /32 receive entries for the addresses assigned to that interface (primary or secondary). No problems were detected on the GRP, and there have been no records of interfaces being reset.
Workaround: Clear the IP CEF table.
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An E1/T1 feature board (FB) does not boot with Cisco IOS Release 12.2(0.11) and Release 12.2(0.12). There is no workaround.
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Symptoms A Cisco uBR7246 router may reload unexpectedly and the system returns to the ROM monitor (ROMmon) prompt because of a bus error at PC 0x2AB, address 0x0.
Conditions This symptom is observed when PPP over Ethernet (PPPoE) is enabled and you turn on Baseline Privacy Interface (BPI). Resource Reservation Protocol (RSVP) for low latency queueing (LLQ) may cause the Q Signaling (QSIG) call features to fail. The basic call setup works correctly.
Workaround There is no workaround.
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Symptoms The terminating end of a Cisco AS5300 that is running Voice over IP (VoIP) may run out of digital signal processors (DSPs) after a prolonged period of operation.
Conditions This symptom is observed on a Cisco AS5300. When the show vfc slot-number technology privileged EXEC command is entered, all DSPs are shown as connected even though there are no calls. When the show call history voice brief privileged EXEC command is entered, all calls are shown as rejected by a 0x3F cause code.
Workaround There is no workaround.
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After every call is completed using Q Signaling (QSIG), the following error message is displayed:
ISDN ERROR: Module-CCPQSIG Function-CCPQSIG_CallReleasing Error-Unknown event 0x57There is no workaround.
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When you set up calls on a Cisco AS5800 series universal access server, the access server displays the following messages:
%DIAL3-3-MSG:
%NP-3-NAKRSP: NAK Response Received
- command 0x1502, result code 0x8010, msg id 0x15FF, session id 0x65, msg tag 0x0
%NP-3-NAKRSP: NAK Response Received
- command 0x1502, result code 0x8010, msg id 0x15FF, session id 0x66, msg tag 0x0There is no workaround.
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Symptoms NM-4A/S and NM-8A/S network modules may not generate a Data Carrier Detect (DCD) signal.
Conditions This symptom is observed on NM-4A/S and NM-8A/S network modules that are configured in an asynchronous mode and that have a DCE cable attached. This symptom does not occur on the WIC-2A/S WAN interface card.
Workaround There is no workaround.
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A Cisco 3620 router that is running Cisco IOS 12.1(5.3)T may reload with a bus error after running out of memory when the router accesses the following MIB counters:
–
–
–
–
–
–
There is no workaround.
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Symptoms Load balancing may not occur, and all packets are forwarded on the same path.
Conditions This symptom is observed when Multiprotocol Label Switching (MPLS) label imposition and load balancing are enabled and an IP packet is received on one subinterface and is forwarded to another subinterface of the same physical interface.
Workaround There is no workaround.
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A B channel may remain in a busy state for an undetermined time after a call is terminated. Eventually, the B channel is released. The time in which the B channel is released varies. There is no workaround.
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Symptoms Segmented messages are not decoded and a lot of information such as Facility IE, Called/Calling number, Bearer Capability, and Channel ID are missing from the output of the debug isdn q931 command.
Conditions This symptom is observed in Cisco IOS Release In 12.2(0.1).
Workaround There is no workaround.
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A Cisco Voice over IP (VoIP) gateway may reload while running a Tool Command Language (TCL) Interactive Voice Response (IVR) voice application. This situation happens when a language other than three fixed languages (en, ch, sp) is configured in an IVR application. There is no workaround.
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When an available bit rate (ABR) permanent virtual circuit (PVC) is used with a Cisco 3600 or Cisco 2600 router on an ATM T1 Inverse Multiplexing over ATM (IMA) module, the maximum output possible on the interface is:
–
–
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Output queue drops are shown on the ATM interface when the show interfaces interface x
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