Release Note for Catalyst 4900M and Catalyst 4948E Switch, Release 15.0(2)SG

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Cisco IOS Software Migration

Support for the Catalyst 4900M platform was introduced in 12.2(40)XO. Moving forward, the Cisco Catalyst 4900M platform has two maintenance trains.

Figure 1 displays the two active trains.

Figure 1 Software Release Strategy for the Catalyst 4900M Series Switch

 

Support

Support for Cisco IOS Software Release 15.0(2)SG follows the standard Cisco Systems® support policy, available at http://www.cisco.com/en/US/products/products_end-of-life_policy.html

Supported Hardware on the Catalyst 4900M Switch
and Catalyst 4948E Ethernet Switch

For Catalyst 4900, 4948E, and 4948E-F switch transceiver module compatibility information, see the url:

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

The following table lists the hardware supported on the Catalyst 4900M series switch.

 

The following table lists the hardware supported on the Catalyst 4948E Ethernet Switch.

 

The following table lists the hardware supported on the Catalyst 4948E-F Ethernet Switch.

 

Supported Features

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Note The default image for the Catalyst 4900M series switch is Cisco IOS Release 12.2(53)SG2.

Table 4 lists the Cisco IOS software features for the Catalyst 4948E Ethernet Switch and Catalyst 4900M series switches. For the full list of supported features, check the Feature Navigator application:

http://tools.cisco.com/ITDIT/CFN/

For information on MiBs support, please refer to this URL:

http://ftp.cisco.com/pub/mibs/supportlists/cat4000/cat4000-supportlist.html

 

1.Hardware-based transparent bridging within a VLAN 2.MAC = Media Access Control 3.VMPS = VLAN Management Policy Server 4.DTP = Dynamic Trunking Protocol 5.RIP = Routing Information Protocol 6.EIGRP = Enhanced Interior Gateway Routing Protocol 7.Refer to the URL:http://www.cisco.com/en/US/docs/ios/saf/configuration/guide/saf_cg.html 8.OSPF = Open Shortest Path First 9.BGP4 = Border Gateway Protocol 4 10.MBGP = Multicast Border Gateway Protocol 11.MSDP = Multicast Source Discovery Protocol 12.ICMP = Internet Control Message Protocol 13.DVMRP = Distance Vector Multicast Routing Protocol 14.NTP = Network Time Protocol 15.SCP = Secure Copy Protocol 16.HSRP = Hot Standby Router Protocol 17.IGMP = Internet Group Management Protocol 18.SSH = Secure Shell Protocol 19.SNMP = Simple Network Management Protocol 20.ACLs = Access Control Lists 21.PACL = Port Access Control List 22.Policy-based Routing 23.QoS = Quality of Service 24.filter-ID and per-user ACL 25.The Catalyst 4500 series switch supports Fast Hellos, ISPF, and LSA Throttling. 26.EEM = Embedded Event Manager: Refer to the URL: http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_eem_3.2.html 27.The route-map keyword is not supported. 28.WS-C4948-10GE does not support VLAN mapping.

Unsupported Features

These features are not supported in Cisco IOS Release 15.0(2)SG for the Cisco Catalyst 4948E Ethernet Switch and the Catalyst 4900M series switch:

• The following ACL types:

– Standard Xerox Network System (XNS) access list

– Extended XNS access list

– DECnet access list

– Protocol type-code access list

• ADSL and Dial access for IPv6
• AppleTalk EIGRP (use native AppleTalk routing instead)
• Auto RP
• AutoQoS - VoIP
• Bridge groups
• CEF Accounting
• CER for E-911 Support
• CFM CoS
• Cisco-Port-QoS-MIB
• Cisco IOS software IPX ACLs:

– <1200-1299> IPX summary address access list

• Cisco IOS software-based transparent bridging (also called “fallback bridging”)
• Connectionless (CLNS) routing; including IS-IS routing for CLNS. IS-IS is supported for IP routing only.
• DLSw (data-link switching)
• Global QoS (enable QoS)
• HTTP Software Upgrade
• IGRP (use EIGRP instead)
• isis network point-to-point command
• ISSU
• Kerberos support for access control
• LLDP HA
• Lock and key
• MAC Address Notification
• MAC notification MIB support
• NAC L2 IP - Inaccessible authentication bypass
• NAT-PT for IPv6
• NSF with SSO
• Packet Based Storm Control
• PIM Stub in IP Base
• Real Time DiagNosis (GOLD-Lite)
• Reflexive ACLs
• Routing IPv6 over an MPLS network
• RPR
• Time Domain Reflectometry
• Two-way community VLANs in private VLANs
• UniDirectional Link Routing (UDLR)

Orderable Product Numbers

• S49EES-15002SG(=)—Cisco Catalyst 4900 IOS Enterprise Services w/o CRYPTO
• S49MES-15002SG(=)—Cisco Catalyst 4900M IOS Enterprise Services w/o CRYPTO
• S49EESK9-15002SG(=)—Cisco Catalyst 4900 IOS Enterprise Services SSH
• S49MESK9-15002SG(=)—Cisco Catalyst 4900M IOS Enterprise Services SSH
• S49EIPB-15002SG(=)—Cisco Catalyst 4900 IOS IP Base w/o CRYPTO
• S49MIPB-15002SG(=)—Cisco Catalyst 4900M IOS IP Base w/o CRYPTO
• S49EIPBK9-15002SG(=)—Cisco Catalyst 4900 IOS IP Base SSH
• S49MIPBK9-15002SG(=)—Cisco Catalyst 4900M IOS IP Base SSH
• S49ELB-15002SG(=)—Cisco Catalyst 4900 IOS LAN Base w/o CRYPTO
• S49ELBK9-15002SG(=)—Cisco Catalyst 4900 IOS LAN Base SSH

New Hardware Features in Release 15.0(2)SG1

Release 15.0(2)SG1 provides no new hardware on the Catalyst 4500 series switch.

New Software Features in Release 15.0(2)SG1

Release 15.0(2)SG1 provides the following new software feature on the Catalyst 4500 series switch.

• A new option for Layer 2 control plane QoS, eapol, enabling customers to police EAPLOL packets based on ethertype.
• IEEE 802.3ad Link Aggregation (LACP) Port-Channel Standalone Disable

New Hardware Features in Release 15.0(2)SG

Release 15.0(2)SG provides the following new hardware for Catalyst 4900M, Catalyst 4948E Ethernet Switch, and Catalyst 4948E-F Ethernet Switch:

• SFP-10G-ER—10GBASE-ER SFP+ transceiver module for SMF, 1550-nm, LC duplex connector
• SFP-10G-ZR—10GBASE-ZR SFP+ transceiver module for SMF, 1550-nm, LC duplex connector

Release 15.0(2)SG provides the following new hardware for Catalyst 4948E Ethernet Switch, and Catalyst 4948E-F Ethernet Switch:

• DWDM SFP Transceivers (8 additional wavelengths) (dual LC/PC connector):

– DWDM-SFP-6141= (Cisco 1000BASE-DWDM SFP 1561.42 nm)

– DWDM-SFP-5736= (Cisco 1000BASE-DWDM SFP 1557.36 nm)

– DWDM-SFP-5332= (Cisco 1000BASE-DWDM SFP 1553.33 nm)

– DWDM-SFP-4931= (Cisco 1000BASE-DWDM SFP 1549.32 nm)

– DWDM-SFP-4532= (Cisco 1000BASE-DWDM SFP 1545.32 nm)

– DWDM-SFP-4134= (Cisco 1000BASE-DWDM SFP 1541.35 nm)

– DWDM-SFP-3739= (Cisco 1000BASE-DWDM SFP 1537.40 nm)

– DWDM-SFP-3346= (Cisco 1000BASE-DWDM SFP 1533.47 nm)

New Software Features in Release 15.0(2)SG

Release 15.0(2)SG provides the following Cisco IOS software features for Catalyst 4900M and Catalyst 4948E Ethernet Switch:

• 2-way Community Private VLANs ("Configuring Private VLANs" chapter)
• Call Home message using dedicated interface (“Configuring Call Home” chapter)
• CPU Optimization for Layer 3 Multicast Control Packets (“Configuring Network Security with ACLs” chapter)
• Critical Authorization for Voice and Data (“Configuring 802.1X Port-Based Authentication 802.1X” chapter)
• Duplication Location Reporting Issue

For information on the reporting issue, refer to the following URL:

http://www.cisco.com/en/US/docs/ios/ netmgmt/configuration/guide/nm_cdp_discover.html

• Enable NEAT for LAN Base (“Configuring 802.1X Port-Based Authentication” chapter)
• IEEE 802.1ag - D8.1 standard Compliant CFM, Y.1731 multicast LBM / AIS / RDI / LCK, IP SLA for Ethernet (“Configuring Ethernet OAM and CFM” chapter)
• Multi-authentication and VLAN Assignment (“Configuring 802.1X Port-Based Authentication

802.1X” chapter)

• NEAT Enhancement: Re-Enabling BPDU Guard Based on User Configuration (“Configuring 802.1X Port-Based Authentication” chapter)
• Netflow-lite (“Configuring Netflow-lite” chapter; supported only on Catalyst 4948E and Catalyst 4948E-F in IP Base or higher)
• Propagation of Location Info over CDP

For information on configuring CDP Location TLV, refer to the following URL:

http://www.cisco.com/en/US/docs/ios/ netmgmt/configuration/guide/nm_cdp_discover.html

• PVLAN over EtherChannel ("Configuring Private VLANs" chapter)
• Resilient Ethernet Protocol-no-edge-neighbor-enhancement (“Configuring Resilient Ethernet Protocol” chapter)
• WCCP Version 2 (“Configuring WCCP Version 2 Services” chapter)

Table 5 Minimum and Recommended ROMMON Release for Catalyst 4900M
and Catalyst 4948E

	Minimum ROMMON Release
Catalyst 4900M Switch	12.2(40r)XO
Catalyst 4948E Ethernet Switch	12.2(44r)SG8

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Open Caveats in Cisco IOS Release 15.0(2)SG8

This section lists the open caveats in Cisco IOS Release 15.0(2)SG8:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

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Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

Resolved Caveats in Cisco IOS Release 15.0(2)SG8

This section lists the resolved caveats in Release 15.0(2)SG8:

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

Open Caveats in Cisco IOS Release 15.0(2)SG7

This section lists the open caveats in Cisco IOS Release 15.0(2)SG7:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

Resolved Caveats in Cisco IOS Release 15.0(2)SG7

This section lists the resolved caveats in Release 15.2(2)SG7:

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

Open Caveats in Cisco IOS Release 15.0(2)SG6

This section lists the open caveats in Cisco IOS Release 15.0(2)SG6:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG6

This section lists the resolved caveats in Release 15.2(2)SG6:

• A %SYS-2-NOBLOCK or %SYS-2-BLOCKHUNG message may appear on the switch when an interface with a QoS policy changes speed at the same time information about that interface is being collected (most commonly through a CLI like the show policy-map... command). Although the QoS policy programming might fail for that interface, no operational impact is observed.

Workaround: None. CSCtk52874

• In a square Layer 2 topology (of at least four switches) where the root bridge is outside of the square (a fifth switch), one link in the square that transitions its role from alternate to root will not send topology change notifications. A stale MAC address may exist in the table until age-out.

Workaround: Reduce MAC aging time or modify Layer 2 topology so that the root is within the square. CSCtx86107

• A switch crashes after displaying the message

provided the following conditions apply:

– A switchport is configured with the following:

authentication event server dead action authorize

authenticaton event server alive action reinitalize

– The RADIUS server was down previously, and a port without traffic (for example, a hub with no devices attached) was authorized into the inaccessible authentication bypass (IAB) VLAN without an associated MAC address.

The RADIUS server becomes available again, and the IAB-authorized port transitions to another state.

Workaround: None. CSCtx61557

Open Caveats in Cisco IOS Release 15.0(2)SG5

This section lists the open caveats in Cisco IOS Release 15.0(2)SG5:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG5

This section lists the resolved caveats in Release 15.2(2)SG5:

• On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* PoE linecards with connected devices that link flap frequently, a single port on a linecard fails to link up.

Workaround: Enter shut then no shut the port to restore connectivity. CSCtz94862

• On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* linecards with PoE, a PoE device will not power up on a single port whereas it works on a different port on the same switch.

Workarounds:

– Connecting a non-PoE device

– Enter shut then no shut on the port. CSCua63562

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

Open Caveats in Cisco IOS Release 15.0(2)SG4

This section lists the open caveats in Cisco IOS Release 15.0(2)SG4:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* PoE linecards with connected devices that link flap frequently, a single port on a linecard fails to link up.

Workaround: Enter shut then no shut the port to restore connectivity. CSCtz94862

• On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* linecards with PoE, a PoE device will not power up on a single port whereas it works on a different port on the same switch.

Workarounds:

– Connecting a non-PoE device

– Enter shut then no shut on the port. CSCua63562

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG4

This section lists the resolved caveats in Release 15.2(2)SG4:

• If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.

Workaround: Clear the MAC address. CSCtn24046

• After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.

Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125

• A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:

The occurs under the following conditions:

– Multi-auth (or multi-host) and MAB dot1x are configured on a port.

– A voice VLAN is not configured on the port.

– The device authenticates through 802.1X.

– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.

– A dynamic VLAN is assigned to the port following 802.1X authorization.

Workarounds:

– Enter shut then no shut on the port to halt the high CPU and log messages.

– Enter the switchport voice vlan command on the port. CSCtw73754

• If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.

Workaround: None. CSCtx25697

• After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.

Workaround: None. CSCtj48387

Open Caveats in Cisco IOS Release 15.0(2)SG3

This section lists the open caveats in Cisco IOS Release 15.0(2)SG3:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.

Workaround: Clear the MAC address. CSCtn24046

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.

Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125

• A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:

The occurs under the following conditions:

– Multi-auth (or multi-host) and MAB dot1x are configured on a port.

– A voice VLAN is not configured on the port.

– The device authenticates through 802.1X.

– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.

– A dynamic VLAN is assigned to the port following 802.1X authorization.

Workarounds:

– Enter shut then no shut on the port to halt the high CPU and log messages.

– Enter the switchport voice vlan command on the port. CSCtw73754

• If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.

Workaround: None. CSCtx25697

• After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.

Workaround: None. CSCtj48387

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG3

This section lists the resolved caveats in Release 15.2(2)SG3:

• When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.

Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.

Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579

• A vulnerability in the Multicast Source Discovery Protocol (MSDP) implementation of Cisco IOS Software and Cisco IOS XE Software could allow a remote, unauthenticated attacker to cause a reload of an affected device. Repeated attempts to exploit this vulnerability could result in a sustained denial of service (DoS) condition.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-msdp

---

Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.

Individual publication links are in ''Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication'' at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html

CSCtr28857

• A vulnerability exists in the Cisco IOS Software that may allow a remote application or device to exceed its authorization level when authentication, authorization, and accounting (AAA) authorization is used. This vulnerability requires that the HTTP or HTTPS server is enabled on the Cisco IOS device.

Products that are not running Cisco IOS Software are not vulnerable.

Cisco has released free software updates that address these vulnerabilities.

The HTTP server may be disabled as a workaround for the vulnerability described in this advisory.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-pai

CSCtr91106

Open Caveats in Cisco IOS Release 15.0(2)SG2

This section lists the open caveats in Cisco IOS Release 15.0(2)SG2:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family.

CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.

Workaround: Clear the MAC address. CSCtn24046

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. CSCts05302

• When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.

Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.

Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579

• After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.

Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125

• A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:

The occurs under the following conditions:

– Multi-auth (or multi-host) and MAB dot1x are configured on a port.

– A voice VLAN is not configured on the port.

– The device authenticates through 802.1X.

– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.

– A dynamic VLAN is assigned to the port following 802.1X authorization.

Workarounds:

– Enter shut then no shut on the port to halt the high CPU and log messages.

– Enter the switchport voice vlan command on the port. CSCtw73754

• If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.

Workaround: None. CSCtx25697

• After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.

Workaround: None. CSCtj48387

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG2

This section lists the resolved caveats in Release 15.2(2)SG2:

• If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.

The primary flex link interface comes up correctly.

Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. CSCtr40070

• When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.

Workaround: None. CSCtr52740

• Configuring and copying a TCL policy may cause a Catalyst 4500 series switch to hang.

Workaround: None. CSCto72927

• Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.

Workaround:

1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.

2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251

• When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.

Workarounds:

– Configure the switch port for mab rather than mab eap.

– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674

• When you enter the rep preempt segment command, the MAC might not flush.

Workaround: Re-enter the rep preempt segment command. CSCtr89862

• A vulnerability in the Multicast Source Discovery Protocol (MSDP) implementation of Cisco IOS Software and Cisco IOS XE Software could allow a remote, unauthenticated attacker to cause a reload of an affected device. Repeated attempts to exploit this vulnerability could result in a sustained denial of service (DoS) condition.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-msdp

---

Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.

Individual publication links are in ''Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication'' at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html

CSCtr28857

• A vulnerability exists in the Cisco IOS Software that may allow a remote application or device to exceed its authorization level when authentication, authorization, and accounting (AAA) authorization is used. This vulnerability requires that the HTTP or HTTPS server is enabled on the Cisco IOS device.

Products that are not running Cisco IOS Software are not vulnerable.

Cisco has released free software updates that address these vulnerabilities.

The HTTP server may be disabled as a workaround for the vulnerability described in this advisory.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-pai

CSCtr91106

Open Caveats in Cisco IOS Release 15.0(2)SG1

This section lists the open caveats in Cisco IOS Release 15.0(2)SG1:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826)

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family. CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.

Workaround: Clear the MAC address. CSCtn24046

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.

The primary flex link interface comes up correctly.

Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. (CSCtr40070)

• Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.

Workaround: Remove these operators from any dynamic ACLs. (CSCts05302)

• When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.

Workaround: None. CSCtr52740

• Configuring and copying a TCL policy may cause a Catalyst 4500 series switch to hang.

Workaround: None. CSCto72927

• Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.

Workaround:

1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.

2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251

• When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.

Workarounds:

– Configure the switch port for mab rather than mab eap.

– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674

• When you enter the rep preempt segment command, the MAC might not flush.

Workaround: Re-enter the rep preempt segment command. CSCtr89862

• When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.

Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.

Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579

• After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.

Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125

• A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:

The occurs under the following conditions:

– Multi-auth (or multi-host) and MAB dot1x are configured on a port.

– A voice VLAN is not configured on the port.

– The device authenticates through 802.1X.

– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.

– A dynamic VLAN is assigned to the port following 802.1X authorization.

Workarounds:

– Enter shut then no shut on the port to halt the high CPU and log messages.

– Enter the switchport voice vlan command on the port. CSCtw73754

• If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.

Workaround: None. CSCtx25697

• After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.

Workaround: None. CSCtj48387

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG1

This section lists the resolved caveats in Release 15.2(2)SG1:

• If you use MDA or multi-auth host mode with authentication open, the switch ignores unicast EAPOL responses.

Workarounds:

– Force the supplicant to use multicast EAPOL.

– Do not use authentication open mode. CSCtq33048

• Class-map hit counters do not increment on the egress policy-map when it is attached to the primary VLAN on a PVLAN trunk ports. However, the traffic is properly classified and the actions configured in the policy are applied properly.

Workaround: None. CSCsy72343

• When Fallback WebAuth and Multi-host is configured on a port and no PACL exists, "permit ip any any" is installed in the TCAM and all traffic from the host is allowed to pass.

Workaround: Configure an ACL on the port. CSCte18760

• After a session falls back to Web Authentication, and no port ACL or fallback ACL is configured, Auth_Default_ACL is programmed infrequently.

Workaround: Configure a port ACL on the interface. CSCtl89389

• A switch configured for epm open directive in multi-auth configuration fails when authentication sessions are cleared.

Workaround: Do not configure open directive on the switch. CSCto48824

• When reconnecting to a switch using device tracking, a Windows Vista, 2008, or 2007 device registers a duplicate address message. A Windows Vista, 2008, or 2007 client probes for a tentative IP address while the switch probes for device status. This duplicate address register issue is usually triggered by disconnecting or reconnecting.

Workaround: Disable gratuitous ARP on the Windows device. CSCtn27420

• If you create a new IPv6 ACL, delete a permit ACE, and then add back the permit ACE, the sh run | b ipv6 access-list command displays unexpected commands on the IPv6 access-list configuration.

In the output above, sequence 40 is the unexpected command that appears in front of the entry.

Workaround: Delete the access-list and reconfigure all entries, rather than deleting or reconfiguring the access-list. CSCtn83348

• Selective Q-in-Q CLIs are rejected on a port-channel after deleting all the one-to-one CLIs.

Workaround: Enter the interface range command to configure all member ports to use a new port channel that is created automatically. CSCtn52362

• A portchannel does not come up after you configure for VLAN translation.

Workaround: Enter shut then no shut on the member port. CSCtn52404

• ND/NS packets are dropped when an IPv6 ACL is attached to an Layer 3 interface.

Workaround: Add the following permit ACEs to the ACL:

CSCtg77035

• If you use IGMP reports with groups like 226.0.0.2, 225.0.0.2, or 225.128.0.2, HSRP hello packets drop and HSRP peers are down. This happens because HSRP hello packets are sent to MAC address 224.0.0.2, which overlaps with the IGMP group addresses just mentioed.

Workaround: None. Use a different IGMP group address. (CSCtq15982)

• The list of VLANs defined by the vlan-range command used for configuring per-VLAN QoS is too long, causing the system to reject the command and display the following log:

Workaround: None (CSCtr49819)

• Switches using ESM logging filter TCL script will fail after some time.

Workaround: Remove the logging filter. (CSCto76709)

• Memory leak is observed in the RADIUS and EAP framework processes. The output of the show mem all totals command displays the name of the leaked memory as AAA Attr String and AAA Attr List.

Workaround: None (CSCto34321)

• When QoS commands are applied line by line on PVLAN isolated trunks, the policer is not applied and line rate traffic exits the port.

Workaround: Cut and paste the configuration. Then apply rapidly to PVLAN isolated trunk port. (CSCtq04058)

• When you make QoS-related changes, a Catalyst 4500 switch may reload unexpectedly.

Workaround: None. (CSCtn77500)

• When the active port set to the egress policy is single, you cannot modify the multicast control packets (like HSRP/OSPF) IP ToS field.

Workaround: None. (CSCtg60011)

• A host IP is not inserted into a URL redirect ACL unless the host IP is already in the device tracking table (DHCP snooping or IPDT).

Workaround: None. CSCtn63638

• DACLs, filter-ID, and proxy ACLs do not function correctly.

Workaround: None. CSCto79232

• If Filter ID or fallback ACLs are currently applied to a port, and you modify them, they will not be programmed correctly in hardware.

Workaround: Modify filter ID or fallback ACLs only when they are not in use. CSCto79274

• RA Guard counters are not incremented in the output of the show ipv6 first-hop counters interface command when Router Advertisement and Router Redirect packets with Destination address FF02::x are dropped.

Workaround: None. CSCtf69108

Open Caveats in Cisco IOS Release 15.0(2)SG

This section lists the open caveats in Cisco IOS Release 15.0(2)SG:

• On rare occasions, if you use an X2 SR transceiver on a WS-X4706-10GE running
  Cisco IOS Release 12.2(40)SG, you will observe CRC errors after a reload or power cycle when you insert the card or the X2.

Workaround: Reinsert the X2. CSCsk43618

• If a class-map is configured with exceed-action drop, re-configuring the same class-map with exceed-action transmit causes class-map configurations to conflict for the same class-map.

Workaround: If you plan to change a class-map action, such as exceed-action, you meed to remove the class-map with the no class c1 command under policy-map submode. Then, apply the new class-map with the updated changes. CSCsk70826

• If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.

Workaround: Enter the show policy-map interface command. CSCsi71036

• When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.

Workaround: None. However, if you enter the show policy-map name, the unconditional marking actions are displayed. CSCsi94144

• IGMP snooping entries are active even after disabling IGMP snooping globally and per VLAN.

Workarounds: Disable IGMP snooping on all the relevant VLANs before disabling it globally.

• IPv6 entries are active in the CAM; the CPU receives IPv6 packets.

Workaround: Unconfigure any generic QOS policies from the system. The QoS policies with the match any attribute cause IPv6 entries to become active. If the switch is a pure Layer 2 device, remove the generic protocol family attributes and narrow it to the protocol family. CSCsq84796

• In Cisco IOS Release 12.2(54)SG, if an etherchannel is a member of a flexlink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (flexlink failure)

Workaround: None. CSCsq99468

• When a CFM Inward Facing MEP(IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
  IFM CC Status as Inactive. Then, you allocate the VLAN, the CC-status remains Inactive.

You only see this symptom if you did not allocate a VLAN before you configure the IFM, then at a later time allocate the same VLAN.

Workaround: Unconfigure, then reconfigure the IFM on the port.

• An IP unnumbered configuration is lost after a reload.

Workarounds: Do one of the following:

– After a reload, copy the startup-config to the running-config.

– Use a loopback interface as the target of the ip unnumbered command

– Change the CLI configuration such that during bootup, the router port is created first.

CSCsq63051

• In SSO mode on the Catalyst 4900M switch, when a port-channel is created, deleted, and re-created on an active supervisor engine with the same channel-number, the standby port-channel state goes out of sync. After a switch over, the following message displays:

Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the portchannel, create a new channel. CSCsr00333

• Duplicate serial number error messages are reported on switching One X Convertor with SFP+, SFP+, X2 to another port, the inserted port enters a faulty status.

This problem impacts X2, OneX converters, and SFP+ on the Supervisor Engine 6-E, and linecards.

Workaround: Remove and reinsert the One X Convertor with SFP+, SFP+ alone, or X2 after some perceivable delay. CSCsu43461

• VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, users will not see the VLAN updates on the other switches in the VTP domain.

Workaround: For VTP database propagation, configure ISL/dot1q trunk port. CSCsu43445

• After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:

This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG

Workaround: None. CSCsw14005

• On a Catalyst 4900M switch, the host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.

If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.

Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661

• Class-map hit counters do not increment on the egress policy-map when it is attached to the primary VLAN on a PVLAN trunk ports. However, the traffic is properly classified and the actions configured in the policy are applied properly.

Workaround: None. CSCsy72343

• When multiple streams of CRC errors are encountered on WS-C4900M configured with OAM Configuration of monitoring the frame errored seconds, OAM does not always report the value of errored frame seconds correctly.

To observe this issue, the following CLIs are configured with window size as the period for monitoring the errors and a low threshold equal to the number of CRC errored seconds seen/expected.

Workaround: Configure a lower value of low threshold such that the frame errors are seen divided into the expected number of frame errored seconds. CSCsy37181

• If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
  show policy-map interface command are wrong.

Workaround: None.

The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149

• On wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.

This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.

Workaround: Use VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS. Specifically, the IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored. CSCsz34522

• When you configure switchport block multicast on a switch running
  Cisco IOS Release 12.2(53)SG1 and later or 12.2(50)SG6 and later, Layer 2 multicast is not blocked.

Prior to Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, the switchport block multicast command would block IP Multicast, Layer 2 multicast, and broadcast traffic (CSCta61825).

Workaround: None. CSCtb30327

• If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for 4948E, C4900M, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.

Workaround: None. CSCte51948

• Fast UDLD in aggressive mode may incorrectly errdisable a link in the following scenarios:

– Fast UDLD peer switch performs SSO.

– Fast UDLD peer switch is reloaded.

– One or more interfaces on a fast UDLD peer switch are shut down (or the port mode changes from switchport to routed, and vice versa).

---

Note To reduce the likelihood of this event, connect at least two physical interfaces between fast UDLD peer switches. You must configure the interfaces with the same neighbor fast hello interval.

Workarounds:

– Reset the error disabled links with the udld reset command.

– Configure error disable recovery with the commands errdisable recovery cause udld and
errdisable recovery interval value (between 30 and 86400 sec).

– Manually clear errdisable on the local interface with a shutdown then a no shutdown.

CSCtc99007

• On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.

Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677

• Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:

This issue does not impact functionality.

Workaround: None.

You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063

• RA Guard counters are not incremented in the output of the show ipv6 first-hop counters interface command when Router Advertisement and Router Redirect packets with Destination address FF02::x are dropped.

Workaround: None. CSCtf69108

• ND/NS packets are dropped when an IPv6 ACL is attached to an Layer 3 interface.

Workaround: Add the following permit ACEs to the ACL:

CSCtg77035

• When you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.

Similarly, the show epm sessions command always displays the authentication method as DOT1X.

Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157

• With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.

Workaround: None. CSCso93282

• When Fallback WebAuth and Multi-host is configured on a port and no PACL exists, "permit ip any any" is installed in the TCAM and all traffic from the host is allowed to pass.

Workaround: Configure an ACL on the port. CSCte18760

• With a NEAT configuration on an ASW (Catalyst 4500 series switch) connected to an SSW (Catalyst 3750 series switch) serving as a root bridge and with redundant links between ASW and SSW, the following occur:

– STP does not stabilize.

– The SVI (network) is unreachable. If an SVI exists on the ASW, because of the STP flap in the setup as well as the CISP operations, the SVI MAC configuration on the ASW is incorrect.

Workaround: Configure the ASW or any other switch upstream as the root-bridge for all the VLANs. CSCtg71030

• When a packet sampling monitor is applied on a Layer 3 port, which is also configured for Layer 3 RACL, you might observe multiple merged ACL path signatures stemming from merging the sampling and security ACL features. This behavior results in multiple (twice) copies of flattened ACE programmed in the TCAM, wasting ACL TCAM space.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches. It does not impact functionality.

Workarounds: Do one of the following:

– Change the interface to a Layer 2 switch port

– Do not configure an ACL access-list on the same Layer 3 interface where sampling monitor is enabled. CSCtn79032

• When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.

Workaround: Configure both dead-criteria and deadtime.

CSCtl06706

• When two distinct Layer 3 CE-facing interfaces exist, each connected to a CE to split WCCP between the two CEs, and you move a particular WCCP service (like 60 (ftp-native)) from one Layer 3 interface to the other, the target interface fails to completely transfer the service to the new CE from the old CE.

Workaround: Shutdown the CE-facing interface. Once all the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941

• After a session falls back to Web Authentication, and no port ACL or fallback ACL is configured, Auth_Default_ACL is programmed infrequently.

Workaround: Configure a port ACL on the interface. CSCtl89389

• When spanning tree is changed from PVST to Rapid PVST and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.

Workaround: Enter shut, then no shut on the ports. CSCtn88228

• If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.

Workaround: Clear the MAC address. CSCtn24046

• If a port has joined a portchannel, you cannot modify a VLAN map configuration of an EtherChannel member port.

Workaround: Shut the member port. CSCtn49832

• Selective Q-in-Q CLIs are rejected on a port-channel after deleting all the one-to-one CLIs.

Workaround: Enter the interface range command to configure all member ports to use a new port channel that is created automatically. CSCtn52362

• A portchannel does not come up after you configure for VLAN translation.

Workaround: Enter shut then no shut on the member port. CSCtn52404

• If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.

Workaround: Reduce the number of VLAN mappings. CSCtn56208

• WCCP service is not reacquired when a service group with a multicast group-address is unconfigured, and then reconfigured.

Workaround: Configure ip multicast-routing globally and establish ip pim sparse-dense-mode on the CE-facing interface. CSCtl97692

• When reconnecting to a switch using device tracking, a Windows Vista, 2008, or 2007 device registers a duplicate address message. A Windows Vista, 2008, or 2007 client probes for a tentative IP address while the switch probes for device status. This duplicate address register issue is usually triggered by disconnecting or reconnecting.

Workaround: Disable gratuitous ARP on the Windows device. CSCtn27420

• If you create a new IPv6 ACL, delete a permit ACE, and then add back the permit ACE, the sh run | b ipv6 access-list command displays unexpected commands on the IPv6 access-list configuration.

In the output above, sequence 40 is the unexpected command that appears in front of the entry.

Workaround: Delete the access-list and reconfigure all entries, rather than deleting or reconfiguring the access-list. CSCtn83348

• If an interface whose IP address is being used as the Router ID is deleted or shuts down and you configure a service group with a multicast group-address, packet redirection to CE stops and packets are forwarded directly to the destination.

Workaround: Unconfigure and reconfigure the service group. CSCtn88087

• When a sampling monitor is configured on a routed port or on a VLAN (an SVI with just one port as a member) and bidir multicast is enabled, a packet sample may be exported even though the original multicast packet was not forwarded by the switch.

This issue only impacts Catalyst 4948E and Catalyst 4948E-F Ethernet Switches.

Workaround: None. CSCtk97612

• If you reboot a switch, the configured value of interface MTU size on the members of port-channel interface does not function for IPv6 traffic.

Workaround: After the switch reloads, enter shut, then no shut on the port-channel interface.

CSCto27085

• A switch configured for epm open directive in multi-auth configuration fails when authentication sessions are cleared.

Workaround: Do not configure open directive on the switch. CSCto48824

• Global WCCP service configuration fails to enable (WCCP global config is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.

Workaround: Enable a Layer 3 interface in the running config. CSCsc88636.

• If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.

Workaround: None. CSCto59368

• A host IP is not inserted into a URL redirect ACL unless the host IP is already in the device tracking table (DHCP snooping or IPDT).

Workaround: None. CSCtn63638

• DACLs, filter-ID, and proxy ACLs do not function correctly.

Workaround: None. CSCto79232

• If Filter ID or fallback ACLs are currently applied to a port, and you modify them, they will not be programmed correctly in hardware.

Workaround: Modify filter ID or fallback ACLs only when they are not in use. CSCto79274

• If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.

The primary flex link interface comes up correctly.

Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. (CSCtr40070)

• When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.

Workaround: None. (CSCtr52740)

• Configuring and copying a TCL policy may cause a Catalyst 4500 series switch to hang.

Workaround: None. CSCto72927

• Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.

Workaround:

1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.

2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251

• When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.

Workarounds:

– Configure the switch port for mab rather than mab eap.

– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674

• When you enter the rep preempt segment command, the MAC might not flush.

Workaround: Re-enter the rep preempt segment command. CSCtr89862

• When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.

Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.

Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579

• After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.

Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125

• A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:

The occurs under the following conditions:

– Multi-auth (or multi-host) and MAB dot1x are configured on a port.

– A voice VLAN is not configured on the port.

– The device authenticates through 802.1X.

– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.

– A dynamic VLAN is assigned to the port following 802.1X authorization.

Workarounds:

– Enter shut then no shut on the port to halt the high CPU and log messages.

– Enter the switchport voice vlan command on the port. CSCtw73754

• If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.

Workaround: None. CSCtx25697

• After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.

Workaround: None. CSCtj48387

• Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.

Workaround: None. CSCtx95359

• If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.

Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212

• When a trunk port is configured with a native VLAN other than VLAN 1, REP packets are not sent on that VLAN.

Workaround: Retain the default setting (VLAN 1) for the native VLAN on trunks ports. CSCud05521

• If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.

Workaround: Retain the trunk native V LAN as 1. CSCud05521

• If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.

Workaround: Shorten the dACL name. CSCug78653

• redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.

Workaround: Return a dACL in the authorization profile with successful guest authentication.

CSCue62019

• If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:

– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.

– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.

If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.

Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646

• If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.

Workaround: Configure RADIUS test and dead criteria.

Example:

CSCtn92693

• If 10Gbps BaseT ports (on WS-X4908-10G-RJ45) are connected to a peer device using a Broadcom BCM84833 chipset, the connection either never boots or takes a very long time (up to an hour).

This issue applies to Cisco IOS Release 15.0(2)SG through 15.0(2)SG7, and 15.1(2)SG through 15.1(2)SG3.

Workaround: Downgrade to Cisco IOS Release 12.2(54)SG. CSCug68370

• In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.

Workaround: Enter the show platform software interface Gix/xx statistic command.

CSCuf60629

• If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.

Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437

Resolved Caveats in Cisco IOS Release 15.0(2)SG

This section lists the resolved caveats in Release 15.2(2)SG:

• If VLAN load balancing is progressing, and you reconfigure VLAN load balancing to reflect different blocking ports, manual preemption does not occur.

Workaround: Reconfigure VLAN load balancing with a different configuration, by performing the following task:

a. Reconfigure the VLAN load balancing configuration on the desired REP ports.

b. Use the shut command on any one REP port in the segment to cause a failure in that segment.

c. Use the no-shut on the same port to restore normal REP topology with one ALT port.

d. Invoke manual pre-emption on a primary edge port to obtain VLAN load balancing with the new configuration. CSCsv69853

• When you remove an SFP+ from a OneX converter in a X2 slot, the system requires roughly 45 seconds to recognize this action. During this interval, all commands reflect that the SFP+ is still present. Reinserting the SFP+ in another port or inserting another SFP+ in the same port can cause a duplicate seeprom error message.

Workaround: When a log message appears indicating that the SFP+ has been removed, do one of the following:

– Enter any commands for that port.

– Insert an SFP+ in that port.

– Reinsert the removed SFP+ in another port. CSCsv90044

• If you disable and re-enable IGMP Snooping on a VLAN, the output of the show mac address command does not display the [term] Switch against the multicast entry. Multicast traffic is not impacted.

Workaround: Do shut, then no shut on the SVI. CSCtg72559

• If host mode multi-domain is configured, after a successful authorization, neither the data device nor the IP phone will pass traffic.

Workaround: None. CSCtj56811

• A switch may fail while loading BGP routes if the ip cef accounting non-recursive command is already configured.

Workaround: Disable the ip cef accounting non-recursive command. CSCtn68186

• When CX1 or SFP+ is plugged into a OneX converter (CVR-X2-SFP10G) in a WS-X4908-10GE, the later requires 1 minute to boot the link.

Workaround: None. CSCtc46340

• A switch crashes when attaching a service-policy to a target, provided the service-policy contains more than 56 classes and each class is associated with an explicit marking action, such as:

Workaround: Use tablemap-based marking. CSC99836

• When you reload an adjoining Catalyst 3400 switch connected to two Catalyst 4500 Series Switches in a REP ring topology, the REP alternate port does not block any traffic.

Workaround: Enter shut then no shut on the alternate port. CSCtn26322

• If a redirect ACL is installed on multiple ports using cisco-av-pair url-redirect-acl=ACLNAME and the ACL is modified, the EPM MAIN process reports elevated CPU usage.

Workaround: None. CSCtn61307

• If host mode multi-domain is configured, after a successful authorization, neither the data device nor the IP phone will pass traffic.

Workaround: None. CSCtj56811

• A non-supplicant PC is connected to an 802.1x port in MDA mode. Upon no response to EAPOL, the PC is placed in a Guest VLAN (correct behavior). If the supplicant is enabled on the PC and the credentials are entered, the switch reports AUTHC success and AUTHZ fail. If client re-attempts 802.1x before the port returns to the Guest VLAN, this process succeeds.

Workaround: None. CSCtl89361

• When a configuration file has VTP mode off and is copied to the running config, the VLANs that are not already in the VLAN database are not created.

Workarounds:

– Use VTP Mode transparent.

– Create the VLANs manually. CSCtl94096

• After reloading and rebooting one of the switches in a REP ring topology, the alternate port forwards traffic and causes a loop.

Workaround: Enter shut, then no shut on the alternate interface. CSCtn03533

• If VLAN load balancing is enabled, after the primary Flex Link goes down and then recovers, a Catalyst 4500 switch sends out multicast frames when the preemption timer expires. The switch sends out one additional unicast frame after it sends out the Flex Link multicast frames, causing the secondary core to learn the MAC address on an incorrect port.

Workaround: None. CSCtk30811

• LACP ports between a Catalyst 4500 Switch and a Nexus enter Suspended Mode when the native VLAN is tagged and changed to x on both chassis (native VLAN is not 1).

Workaround: None. CSCtj90471

• LLDP frames are tagged incorrectly when leaving an 802.1q port if the native VLAN has a value other than 1.

Workaround: Use the default native VLAN (VLAN of 1) for the trunks. CSCtn29321

• If a port channel is created on a Catalyst 4948E Ethernet Switch 1 Gigabit Ethernet SFP upstream interface and one of the interface links goes down, the average convergence time is roughly 3 sec.

This behavior is not observed on 10 Gigabit Ethernet SFP+ uplink interfaces.

Workaround: None. CSCth51469

Netbooting from the ROMMON

Netbooting using a boot loader image is not supported. Instead, use one of the following options to boot an image:

1. Boot from a CompactFlash card by entering the following command:

---

Note The Catalyst 4948E does not contain a compact flash slot.

2. Use ROMMON TFTP boot.

The ROMMON TFTP boot is very similar to the BOOTLDR TFTP boot, except that:

– the BOOTLDR variable should not be set

– the TFTP server must be accessible from the Ethernet management port on the supervisor engine.

To boot from ROMMON, perform the following tasks while in ROMMON mode:

a. Ensure that the Ethernet management port is physically connected to the network.

b. Verify that bootloader environment is not set by entering the unset bootldr command.

c. Set IP address of the Ethernet management port on the supervisor engine by entering the following command: set interface fa1 ip_address > < ip_mask

For example, to set the supervisor engine Ethernet port with an IP address 172.16.1.5 and IP mask 255.255.255.0, enter the following command:

d. Set default gateway for the Ethernet management port on the supervisor engine by entering the following command: set ip route default gateway_ip_address. The default gateway should be directly connected to the supervisor engine Ethernet management port subnet.

e. Ping the TFTP server to ensure that there is connectivity to the server from the Ethernet management port on the supervisor engine by entering the following command: ping < tftp_server_ip_address >.

f. Once the ping is successful, boot the image from the TFTP server by entering the following command: boot tftp:// tftp_server_ip_address > / < image_path_and_file_name

For example, to boot the image name cat4500-ipbase-mz located on the TFTP server 172.16.1.8, enter the following command:

Troubleshooting at the System Level

This section contains troubleshooting guidelines for system-level problems:

• When the system is booting and running power-on diagnostics, do not reset the switch.
• Ensure that you do not mix the serial and Ethernet cables. The Ethernet Management port is inoperative. An Ethernet cable plugged into the Ethernet port is active only in ROMMON mode.

Troubleshooting Modules

This section contains troubleshooting guidelines for the Catalyst 4900M series switch:

• Whenever you connect an interface that has duplex set to autonegotiate to an end station or another networking device, ensure that the other device is configured for autonegotiation as well. If the other device is not set to autonegotiate, the port set to autonegotiate will remain in half-duplex mode, which can cause a duplex mismatch resulting in packet loss, late collisions, and line errors on the link.

Troubleshooting MIBs

For general information on MIBs, RMON groups, and traps, refer to the Cisco public MIB directory ( http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml). For information on the specific MIBs supported by the Catalyst 4900M series switches, refer to the Catalyst 4000 MIB Support List located at ftp://ftp.cisco.com/pub/mibs/supportlists/cat4000/cat4000-supportlist.html.

Hardware Documents

Installation guides and notes including specifications and relevant safety information are available at the following URLs:

• Catalyst 4500 Series Switches Installation Guide

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/installation/guide/78-14409-08/4500inst.html

• Catalyst 4500 E-series Switches Installation Guide

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/catalyst4500e/installation/guide/Eseries.html

• For information about individual switching modules and supervisors, refer to the Catalyst 4500 Series Module Installation Guide at:

http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_installation_guides_list.html

• Regulatory Compliance and Safety Information for the Catalyst 4500 Series Switches

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/regulatory/compliance/78_13233.html

• Installation notes for specific supervisor engines or for accessory hardware are available at:

http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_installation_guides_list.html

• Catalyst 4900 and 4900M hardware installation information is available at:

http://www.cisco.com/en/US/products/ps6021/prod_installation_guides_list.html

• Cisco ME 4900 Series Ethernet Switches installation information is available at:

http://www.cisco.com/en/US/products/ps7009/prod_installation_guides_list.html

Software Documentation

Software release notes, configuration guides, command references, and system message guides are available at the following URLs:

• Catalyst 4500 release notes are available at:

http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_release_notes_list.html

• Catalyst 4900 release notes are available at:

http://www.cisco.com/en/US/products/ps6021/prod_release_notes_list.html

• Cisco ME4900 4900 Series Ethernet Switch release notes are available at:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_11511.html

Software documents for the Catalyst 4500 Classic, Catalyst 4500 E-Series, Catalyst 4900, and
Cisco ME 4900 Series Ethernet Switches are available at the following URLs:

• Catalyst 4500 Series Software Configuration Guide

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_installation_and_configuration_guides_list.html

• Catalyst 4500 Series Software Command Reference

http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_command_reference_list.html

• Catalyst 4500 Series Software System Message Guide

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_system_message_guides_list.html

Cisco IOS Documentation

Platform-independent Cisco IOS documentation may also apply to the Catalyst 4500 and 4900 switches. These documents are available at the following URLs:

• Cisco IOS configuration guides, Release 12.x

http://www.cisco.com/en/US/products/ps6350/products_installation_and_configuration_guides_list.html

• Cisco IOS command references, Release 12.x

http://www.cisco.com/en/US/products/ps6350/prod_command_reference_list.html

You can also use the Command Lookup Tool at:

http://tools.cisco.com/Support/CLILookup/cltSearchAction.do

• Cisco IOS system messages, version 12.x

http://www.cisco.com/en/US/products/ps6350/products_system_message_guides_list.html

You can also use the Error Message Decoder tool at:

http://www.cisco.com/pcgi-bin/Support/Errordecoder/index.cgi

• For information about MIBs, refer to:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

OpenSSL/Open SSL Project

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/).

This product includes cryptographic software written by Eric Young (eay@cryptsoft.com).

This product includes software written by Tim Hudson (tjh@cryptsoft.com).

License Issues

The OpenSSL toolkit stays under a dual license, i.e. both the conditions of the OpenSSL License and the original SSLeay license apply to the toolkit. See below for the actual license texts. Actually both licenses are BSD-style Open Source licenses. In case of any license issues related to OpenSSL please contact openssl-core@openssl.org.

OpenSSL License:

Copyright © 1998-2007 The OpenSSL Project. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. All advertising materials mentioning features or use of this software must display the following acknowledgment: “This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/)”.

4. The names “OpenSSL Toolkit” and “OpenSSL Project” must not be used to endorse or promote products derived from this software without prior written permission. For written permission, please contact openssl-core@openssl.org.

5. Products derived from this software may not be called “OpenSSL” nor may “OpenSSL” appear in their names without prior written permission of the OpenSSL Project.

6. Redistributions of any form whatsoever must retain the following acknowledgment:

“This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/)”.

THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT “AS IS”' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

This product includes cryptographic software written by Eric Young (eay@cryptsoft.com). This product includes software written by Tim Hudson (tjh@cryptsoft.com).

Original SSLeay License:

Copyright © 1995-1998 Eric Young (eay@cryptsoft.com). All rights reserved.

This package is an SSL implementation written by Eric Young (eay@cryptsoft.com).

The implementation was written so as to conform with Netscapes SSL.

This library is free for commercial and non-commercial use as long as the following conditions are adhered to. The following conditions apply to all code found in this distribution, be it the RC4, RSA, lhash, DES, etc., code; not just the SSL code. The SSL documentation included with this distribution is covered by the same copyright terms except that the holder is Tim Hudson (tjh@cryptsoft.com).

Copyright remains Eric Young’s, and as such any Copyright notices in the code are not to be removed. If this package is used in a product, Eric Young should be given attribution as the author of the parts of the library used. This can be in the form of a textual message at program startup or in documentation (online or textual) provided with the package.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. All advertising materials mentioning features or use of this software must display the following acknowledgement:

“This product includes cryptographic software written by Eric Young (eay@cryptsoft.com)”.

The word ‘cryptographic’ can be left out if the routines from the library being used are not cryptography-related.

4. If you include any Windows specific code (or a derivative thereof) from the apps directory (application code) you must include an acknowledgement: “This product includes software written by Tim Hudson (tjh@cryptsoft.com)”.

THIS SOFTWARE IS PROVIDED BY ERIC YOUNG “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The license and distribution terms for any publicly available version or derivative of this code cannot be changed. i.e. this code cannot simply be copied and put under another distribution license [including the GNU Public License].

 

This document is to be used in conjunction with the documents listed in the “Related Documentation” section.

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All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0711R)

Release Notes for the Catalyst 4900 Series Switch, Cisco IOS Release 15.0(2)SG
Copyright © 2008-2011, Cisco Systems, Inc. All rights reserved.