The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
This chapter describes open and resolved severity 1 and 2 caveats and select severity 3 caveats:
NoteFrom Cisco IOS Release 12.2(33)SCD2 and later, the Caveats section only includes the bug ID and a short description of the bug. For details on the symptoms, conditions, and workaround for a particular bug you must use the Bug ToolKit. For more details, seeUsing the Bug Toolkit.
The bug IDs are sorted alphanumerically.
NoteThe Caveats section includes the bug ID and a short description of the bug. For details on the symptoms, conditions, and workaround for a specific caveat you must use the Bug Search Tool.
Cisco Bug Search Tool (BST), the online successor to Bug Toolkit, is designed to improve effectiveness in network risk management and device troubleshooting. You can search for bugs based on product, release, and keyword, and aggregates key data such as bug details, product, and version. For more details on the tool, see the help page located at http://www.cisco.com/web/applicat/cbsshelp/help.html .
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The privilege exec level 1 show interfaces command causes CPU utilization at the show run and write memory commands. |
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Users with lower privilege levels than enable access may not be able to execute some show cable command options. |
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Memory leaks are observed on Cisco UBR-MC20X20V protect line card although, line card switchover was not performed. |
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Cisco CMTS crashes due to memory corruption when BPI is enabled. |
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Standby performance routing engine (PRE) may crash when UBR10K RP-CLC ISSU PROXY RF client fails to complete the RF_PROG_ISSU_NEGOTIATION progression. |
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Rate-limiting on the upstream channel is activated before the peak rate is reached leading to bandwidth requests being dropped prematurely on the Cisco UBR10-MC20X20 line card. |
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There is a delay of Cisco uBR10012 route processor or cable line card to detect a IPC keepalive timeout condition, which in turn causes the delay of IPC recovery actions that are triggered by the detect. |
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Upstream speed goes down and the Cyclic Redundancy Check (CRC) error counts increase with a Cisco uBR10-MC5X20U line card. |
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The DOCSIS 3.0 PC call stops working after the media terminal adapter (MTA) goes into a partial mode of one downstream. |
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The cable modem might lose IP connectivity. The cable modem stays connected to the Cisco CMTS, but no data frames go trough the upstream. |
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UBR10K-6-CM_INCONSISTENCY message is observed on new active PRE after a PRE switchover and after the standby PRE boots, some UBR10000-3-DOCSIS_SYNC_SF messages are printed. |
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CMTS may crash when a SNMP query or any other event makes the CMTS to go through the list of ALL service-flows. |
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Wideband modems do not go wideband online when a MAC domain has multiple MD-DS-SGs. |
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The Cisco IOS Software network address translation (NAT) feature contains multiple denial of service (DoS) vulnerabilities in the translation of the following protocols:
All the vulnerabilities described in this document are caused by packets in transit on the affected devices when those packets require application layer translation. Cisco has released free software updates that address these vulnerabilities. http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-nat . |
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The docsIfCmtsCmStatusEntry object identifier takes longer time to access the associated MIBs. |
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The Cisco IOS Software network address translation (NAT) feature contains multiple denial of service (DoS) vulnerabilities in the translation of the following protocols:
All the vulnerabilities described in this document are caused by packets in transit on the affected devices when those packets require application layer translation. Cisco has released free software updates that address these vulnerabilities. This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-nat . |
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The PRE crashes when the Internet Protocol Data Records (IPDR) session is reconfigured and when the IPDR exporter is started or stopped. |
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Line card crashes during bootup and machine check exception error is displayed. |
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On a Cisco UBR-MC20X20 LC, cable modems (with BPI enabled) having their primary service flow on a local downstream and a secondary unicast service flow on a SPA, may lose L3 IP connectivity on the secondary service flow. |
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External SNMP scripts take longer to complete when compared to Cisco UBR10-MC5X20H line cards. |
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The Downstream Channel Descriptor (DCD) counters for DSG do not increment after a line card failover. |
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When packet classifiers are configured with IPv6, the docsIetfQosPktClassEntry MIB does not show these configured values. |
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On Board Failure Logging (OBFL) Uptime application does not work on some Cisco uBR-MC3GX60V boards. |
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If a cable modem undergoes vacillating attenuation, it gets into a power average enable mode (where the "*" displays in the "show cable modem" next to the power level) and then gets stuck in that mode. Even though the cable modem is at maximum power, it continues to stay in power average enable mode and never falls offline. In most cases, this results in the cable modem losing layer 3 traffic entirely without giving any notification that the modem dropped offline. |
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The Cisco CMTS router continuously sends LEASEQUERIES for the IP addresses of the customer premises equipment (CPE), when the CPE is behind an offline cable modem. |
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Traceback observed on the Cisco UBR-MC20X20V and Cisco uBR-MC3GX60V line cards due to the Command Scheduler (KRON) configuration issue. |
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The downstream packet is dropped instead of being forwarded by primary service flow when the downstream classifier is configured for multiprotocol label switching (MPLS) L2VPN Business Services over DOCSIS (BSoD) cable modem and the downstream packet has exp value 0 but there is no matching classifier. |
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Error messages "ALIGN-3-SPURIOUS" or "ALIGN-3-TRACE" are observed when the debug cr10k-rp pkt conditional command is enabled on PRE. |
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Inconsistent values are displayed for the cable cm-status enable configuration for the UBR-MC20X20V and uBR-MC3GX60V line cards. |
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Mismatch in secondary service flow between the route processor and the cable line card causes loss of traffic. |
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Spurious Push Button interrupts are detected by the DTCC card. |
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When debugging CA certificates or CM certificates, incorrect certificates are printed to the screen. |
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Layer 3 multicast module receive MLD report even if multicast authorization is denied at cable level. |
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High CPU utilization on the cable line card results in connectivity loss with the cable modem due to loss of IPC messages when writing encryption keys to the SPA card during high CPU utilization. |
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Cable modem with MDF 2 cannot receive encrypted multicast on Cisco UBR-MC20X20V line card wideband interface. |
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When severe attenuation is applied, CM remains online however L3 is not pingable. |
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Active PRE crashes when the redundancy force-switchover main-cpu command is executed on standby PRE. |
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Inconsistent per upstream and per CM CNR are observed on Cisco uBR-MC3GX60V line card. |
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Wideband cable modems go offline after line card switchover. |
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Downstream override is performed infinitely for narrowband cable modems. |
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Excessive number of "Config update master:Bundle...." console messages, such as "Config update master:Bundle1, slave:Cable6/0/2" are being displayed. |
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PRE crash is observed after several line card and PRE switchovers. |
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Wideband modems connected to a Cisco UBR-MC20X20V line card are not ping-able after protect line card and working line card are reset. |
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Wideband and narrowband association disappears causing wideband cable modems to go offline. |
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The CMTS assigns cable modems to Restricted Load Balance Groups (RLBGs) to which the cable modem is not physically connected to. |
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Changing IGMP query Interval to higher interval causes the mroute to prematurely timeout. |
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The CMTS may crash when no ipdr collector is configured, collector is connected with IPDR exporter and CONNECT messages are sent, and the TCP connection is terminated by the collector. |
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The Cisco uBR10K PRE4 crashes when the upstream Cable x/y connector command is executed. |
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Spurious memory loss may be observed after issu abortversion command is issued. |
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The line card that is not in HCCP group, does not revert back after ISSU abortversion. |
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The output of the show inventory command incorrectly identifies the DC power entry module as AC power entry module. |
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The US SF database of line card and route processor may be out of sync. |
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Traceback observed at issu_get_msg_mtu after issu linecard loadversion command was executed. |
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Error Messages %UBR10000-4-SERVICE_FLOW_ZERO_BLAZE_INDEX_ERROR and%UBR10000-2-CMTS_INDEX_TABLE_FULL are observed on the CMTS. |
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When the whole chassis is reloaded, the downstream RF power is reset to 52 dBmV irrespective of what is configured under the controller. Downstream PHY error messages are also seen in the syslog. |
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Cable Modems may get deleted by CMTS incorrectly after multiple number of key renewals. This is typically after 72 hours of being online for the modems affected. |
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The active line card resets during a static synchronization, when the number of upstream service flows on a single cable modem is greater than 35. |
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Many SNMP MIBs such as cdxCmCpeTable and CMTS commands such as show cable device access-group may not display the IPv6 cable modems or hosts in their output. |
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The IPC port disappears and error messages are displayed on the Cisco CMTS. |
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There is a drop in the link when the Cisco SFP and the RF gateway uses other vendor’s SFPs. |
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The "GENERAL-2-CRITEVENT: Request CIR exceeds available link rate" error message is displayed on the Cisco CMTS after service flow admission requests are created. |
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The default IOFPGA region in the PRE processor module has no information. |
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DSG TG tunnels are not added to the line card cable interface. The following error message is displayed. |
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The primary PRE crashes while creating the MQoS service flow (SF). |
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Cable modems go offline and recover only after the line card is reloaded. This issue was observed on the UBR10-MC5X20H card. |
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The ethernet controller TSEC register changes are seen on the DTCC card. The controller transmits traffic longer than required. |
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The standby line card crashes when static synchronization occurs with 480 multicast sessions. |
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The PRE processor engine hangs after an excessive collision. |
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Downstream ambiguity resolution frequency list is generated incorrectly when overlapping frequencies exist in the MAC domain downstream service group. |
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The default MQoS queue is not used in multicast service flow configuration after removing QoS from DOCSIS Set-Top Gateway (DSG) tunnel. |
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Traffic does not flow to the cable modem when the primary channel of cable modem is not in the bonding group and the non-primary RF channels are down. |
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The Cisco CMTS crashes after the wideband interface is configured with the 24 RF channels. |
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Removal of load balancing DCC group causes voice calls to drop at T8 timer time out. |
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Cisco CMTS crash is observed during SPA online insertion and removal (OIR) when multicast fast channel change is being performed. |
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Remora QDR error checking and correction multi-bit error causes system to crash. |
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PRE crash is observed during SPA OIR when multicast fast channel change is performed. |
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On a UBR10012 router with a PRE4, the show environment all command wrongly identifies a UBR10-PWR-AC-PLUS power source as a DC PEM when the Product ID switch on the PEM is illuminated. |
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Cisco CMTS boot fails causing PRE4 crash when On Board Failure Logging (OBFL) feature is enabled. |
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PacketCable (PC) Dynamic QoS(DQoS) call does not work. The show packetcable gate summary command output displays the stuck PC DQoS gates in ALLOC state, for the affected PC subscriber. |
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In rare cases, SIP-600 Ethernet Controller (eTSEC) violates IEEE802.3 specification for busy line by transmitting longer than allowed by the specification. As a result, Ethernet packets loss maybe observed across the network. |
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A memory leak is observed on the cable line card when Dynamic Bonding Change (DBC) operation is invoked for a WB modem. |
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Cisco CMTS router crashes when the show buffers usage command is executed repeatedly. |
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The login command, in exec configuration mode, allows an already logged in user to change the username that is reported for the active session. |
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PRE crashes after the online insertion and removal (OIR) of the line card. |
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Static routes configured in the startup config do not take into effect till the router is re-configured. |
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Multicast ping works only for first few seconds when a tunnel is created. |
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The login on-failure command does not log the failed username consistently. |
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No system log or SNMP trap gets generated when COPS process, that is used for packetcable, fails. |
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The Cisco IOS Software network address translation (NAT) feature contains multiple denial of service (DoS) vulnerabilities in the translation of the following protocols:
All the vulnerabilities described in this document are caused by packets in transit on the affected devices when those packets require application layer translation. Cisco has released free software updates that address these vulnerabilities. This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-nat . |
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Configuring the 5X1 Gigabit Ethernet port is not possible after swapping SPAs. |
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An IPC timeout could lead to a crash on the Cisco uBR10-MC5X20H line card. |
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The Wideband SPA does not perform Address Resolution Protocol (ARP) after the failure of the active port. |
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When call volume is high, and numerous stop records are being generated by CMTS, it is observed that an invalid XML file gets generated occasionally. |
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The wideband CM number shown in the show cable mac-domain Cx/y/z rcc command output is incorrect. |
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The show hccp command fails to show any result though HCCP redundancy is configured in the running-configuration. |
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An IPv6 customer premise equipment (CPE) fails to get an IP address when it is connected to an IPv4 cable modem. |
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The CPE entries are displayed even after the CPE is disconnected from the cable modem. |
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An error occurs when the line cards are powered on which prevents the cable modems to come online. |
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Maximum Transmission Unit (MTU) size is not inherited by the subinterfaces on the Gigabit Ethernet VLAN. |
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Wideband modems moving from reject (pk) to online (pt) do not complete the Baseline Privacy Interface (BPI) negotiation. |
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Incorrect decode of the interrupt stack for saved registers is displayed in the crashinfo file. |
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Multicast may select the forwarding interface which does not match to the req-attribute mask. |
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A Cisco UBR-MC20X20V line card crash is observed due to partial packets entering the FPGA. |
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The protect line card crashed after performing a manual switchover from working Cisco uBR10-MC5x20H line card to the protect line card. |
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Spectrum management does not work on the Cisco UBR-MC20X20V line card when the bandwidth is set to EuroDOCSIS frequency range. |
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Iron bus faults causes the Cisco uBR10-MC5X20H line card to reset. |
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SFP Missing Critical Alarm should be cleared if the interface is in "admin shutdown" status even if SFP is not installed. |
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The Cisco UBR10-MC20X20V line card resets when the show tech-support cmts command is executed. |
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Downstream service flow statistics display zeroes after an In-Service software upgrade (ISSU) PRE module switchover. |
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Cisco Service Independent Intercept (SII) tap stops intercepting traffic. |
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Inconsistent synchronization PRE error messages are displayed when the standby PRE module boots up. |
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Cisco IOS Software contains a memory leak vulnerability in the Data-Link Switching (DLSw) feature that could result in a device reload when processing crafted IP Protocol 91 packets. Cisco has released free software updates that address this vulnerability. http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-dlsw . |
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SNMP query on empty docsQosPktClassEntry/docsQos3PktClassEntry/docsIetfQosPktClassEntry takes a long time to return results. |
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The protect line card state is not correct after removing the working line card from the high availability group. |
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The show cable calls command displays the interface with upstream channel bonding even if there are no voice call associated with that particular interface. |
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The show interface wideband-cable slot /1/ ctrlr : wb chan downstream command displays no information. |
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The show cable modem x . y . z qos or show cable modem x . y . z service-flow [ verbose ] command displays very high throughput values for a short time when traffic rates are much lower than reported. |
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ifSpeed returns actual data instead of raw data on the integrated-cable interface/modular-cable interface. |
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The ISSU CLC-CHANGEVERSION is delayed if the protect line card is active. |
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Inbound octets (ifInOctets) return the value 0 for the Wideband SPA Gigabit Interface. |
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The FFT engine is not updated with the CNR threshold values if a change is made either in the CLI or the SNMP interface to the CNR threshold profile for a given upstream. |
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The Dynamic Secret Background process consumes lots of CPU memory and results in traceback. |
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The (*,G) entry is generated while configuring Source Specific Multicast (SSM) mapping, if the CMTS autorization is deny (S,G). |
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The interface column length of show cable modem cx/y/z docsis version summary needs to be increased. |
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Memory leak is observed on the protect card. The memory is used for packetcable gate database and gate bin. |
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CPE is not receiving multicast traffic data packets after the Cisco uBR-MC20X20V line card failover. |
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The docsQos3ServiceFlowParamSetTypeStatus is returning wrong values. |
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The Cisco UBR-MC20X20V and Cisco UBR10-MC5X20 line cards are crashing while issuing the clear cable modem command when the CMTS metering is running. |
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The BPI+ policy fails in PRE4. Traffic is not getting blocked using the default per-device ACL. |
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Downstream packet loss is observed on the wideband bonding group. |
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Cable modems using SPA downstreams online(pt) cannot pass layer 3 traffic; IPC channel between Cisco uBR-MC520 and SIP is down. |
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Cisco uBR10012 router crashes after getting doubly-linked list corruption message. |
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The show cable modem maintenance command output is showing wrong timestamp for Exhausted Time. |
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Line card switchover during voice calls is crashing the protect line card. |
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Traceback occurs after line card high availability revertback. |
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Admission control is not preventing committed information rate (CIR) over-subscription on PCMM multicast bulk calls. |
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It is not possible to create more than one wideband interface on a Cisco uBR10012 router. |
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Cisco uBR10012 router crashes while executing the show packetcable gate summary command. |
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When performing an ISSU linecard abortversion during ISSU-MS operations, the system will begin the ISSU process for all upgraded CLCs without regard to the PLC state. |
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When the ingress cancellation feature is enabled, all modems on an upstream may momentarily go offline and then recover within minutes. |
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The standby RP does not retain its original state after the issu abortversion command is executed. |
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Wideband and Modular Statistics are displayed incorrectly as 0 after the issu runversion command is executed and the PRE switches over to the new image. |
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Cable modems are going offline while executing test cable UCC command. |
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It is observed that the Received Power shown in the show cable modem x.x.x verbose command would always incorrectly report 0.00 for every upstream in the bonding group when testing upstream performance characteristics by introducing upstream attenuation. |
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Upstream traffic cannot be recovered after a PRE switchover when cable modems directly go to the online(pt) state. |
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The cable remote query ignores the configured source IP address as set by the cable modem remote-query src-ip command and wrongly considers the bundle cable IP address as source address. |
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The show pxf cable intercept command output does not display the resource counters. |
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CPE is not responding to pings when CM is moved to a different primary downstream. |
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The downstream BPI index leak occurs when DCC tech 1, 2, 3, or 4 is used on SPA Modular-Cable interfaces. |
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Spurious memory access traceback was observed after the IPDR Exporter was configured and initiated on the CMTS. |
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The active PRE crashes on execution of the show cable mutlicast db command. |
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Disabling debug cable receive and text protection may cause 100% CPU utilization. |
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The line card channel ID becomes zero when no downstream modular-cable slot/subslot/bay rf-channel command is issued. |
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PRE crashed at "docs_cpetype_ipdr_sender" after "hw-module reset" on the line card. |
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The CPE behind a CM loses layer 3 connectivity after the CM is load balanced to a different interface. |
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The customer premise equipment (CPE) does not receive dynamic multicast traffic. |
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DOCSIS 3.0 service flows may not meet the minimum reserved rate under congestion. |
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The test hccp rfswitch relay command fails to execute from the Secure Shell (SSH) mode. |
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The Baseline Privacy Interface (BPI) index is zero for a w-online cable modem after the line card switchover. |
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DOCSIS 3.0 service flow does not reach its minimum rate when channels are heavily congested with UDP traffic. |
Symptoms: The clear cable modem command does not reset the modular-host tables.
1. No fiber nodes are configured.
2. Some narrow-band modems are bought online from the shared port adapter (SPA) downstream.
3. The clear cable modem all reset command is used to reset the modems.
After this command is executed, all the stat or BPI, or PHS indexes in the modular host tables are expected to be released, but are not released.
This causes a leak in the stat or BPI, or PHS indexes and raises a Cable Modem Transmission System (CMTS) scalability issue, that is, the CMTS is unable to support the stated number of modems online from the SPA downstream.
Workaround: There is no workaround.
Symptom: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release 12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is observed when the CMTS is running Cisco IOS Release 12.3(21)BC and while upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down and physically reconfigured to run as an M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted, DTCCs inserted, so on.). Finally, the CMTS must be switched on to run its new Cisco IOS Release 12.2(33)SCB IOS image and physical configuration.
Workaround: There is no workaround.
Symptoms: CMs do not respond to Layer 3 pings.
Conditions: This issue occurs only on the Cisco uBR10-MC5X20S/U line cards when an equalization-coefficient PRE is configured.
Workaround: Restart the cable line card.
Symptoms: Alignment traceback messages are displayed when the show memory leak res user and show buffer usage commands are executed.
Conditions: This issue occurs when the show memory leak res user and show buffer usage commands are executed in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
Symptoms: Memory leak occurs on a line card due to MAC parser with overnight PC calls.
Conditions: This issue occurs after overnight PC calls are made.
Workaround: There is no workaround.
Symptoms: OIR of a PCMCIA flash disk can cause a watchdog reset of the PRE.
Conditions: This issue is observed during the OIR of a PCMCIA flash disk that is being actively accessed.
Workaround: Restrict the removal of PCMCIA flash disks.
Symptoms: Sporadic short losses of a few minutes occur when multiple CMs go off on a random upstream. These losses are usually accompanied by a spike in the error per second rate or by an MER drop and a decrease in docsIfSigQUnerroreds MIB Object. However, the reverse is not true—a brief degradation of the physical connectivity parameters does not necessarily trigger a brief CM loss.
Conditions: This issue occurs on the Cisco uBR10-MC5X20H line cards.
Workaround: There is no workaround.
Symptoms: Entries in the docsBpi2CmtsMulticastObjects MIB object are duplicated after a line card revertback.
Conditions: This issue occurs when the cable match command is configured with BPI. The IGMP join is received for the group in the cable match command, and the docsBpi2CmtsMulticastObjects MIB object is populated. This results in line card switchover and revertback.
Workaround: There is no workaround.
Symptoms: Users with a privilege level of 15 and view root cannot perform a secure copy (SCP).
Conditions: This issue occurs when users with view root privilege try to perform an SCP.
Workaround: Remove the ‘view root’ privilege.
Symptoms: The Cisco uBR10000 PRE CPU utilization rises to 100% when the FPGA on the Wideband SPAs plugged into a Cisco SIP-600 are being upgraded.
Conditions: This issue occurs during the Wideband SPA FPGA upgrade process.
Workaround: There is no workaround.
Symptoms: An active PRE fails over to secondary reporting with the following message:
Conditions: This issue occurs in Cisco IOS Release 12.3(23)BC7.
Workaround: There is no workaround.
Symptoms: The router crashes while trying to delete files from corrupt Analog Telephone Adaptor (ATA) disk.
Conditions: This issue occurs when an ATA disk is corrupted. The following message is displayed in the ATA disk during access:
Workaround: There is no workaround.
Symptoms: Around 60 to 70 bytes of buffer memory space is allocated when a protect line card becomes active after a system start.
Condition: This issue occurs during a line card switchover.
Workaround: There is no workaround.
Symptoms: After PRE switchover, the corresponding service flow counter displays 0 on the Cisco uBR10012 router.
Conditions: This issue occurs during a PRE switchover.
Workaround: There is no workaround.
Symptoms: Signal Noise (SN) ratio is always displayed as 0.0 for a Cisco DPC3000 modem.
Conditions: This issue occurs in a Cisco DPC3000 modem because it does not support the current SNMP OID docsIfSigQSignalNoise to query SN ratio.
Workaround: There is no workaround.
Symptoms: The grouping of SSM multicast groups from any source to one group configuration is not possible. The Cisco CMTS treats the session range as ASM.
Conditions: This issue occurs in a multicast group configuration.
Workaround: Configure the correct group range with a valid mask. Map the SSM from any source configured as ASM. For example, session-range 239.50.0.0 255.255.0.0.
Symptoms: The router crashes in Cisco IOS Release 12.3 (33) SCB, if the Cisco UBR-MC20X20V card is added or removed from the redundancy configuration.
Conditions: This issue is observed when the line card type is unknown and the line card redundancy is configured.
Workaround: There is no workaround.
Symptoms: The cable line card crashes with PacketCable Multimedia (PCMM) voice call testing.
Conditions: This issue occurs in a multiline ATA behind the CMs in a PCMM setup.
Workaround: There is no workaround.
Symptoms: Dynamic multicast service flow and reserved bandwidth exist even after the removal of the multicast QoS (MQoS) configuration from the second bonding group.
Conditions: This issue occurs after as MQoS bandwidth reservation oversubscription takes place.
Workaround: Perform a PRE switchover.
Symptom: The show cable modem service-flow verbose command incorrectly displays the MAC Rewrite Indices (MRI) that exceed 64 k. Subsequent information displayed by this command is also incorrect because it is dependent on the MRI.
Conditions: This issue occurs when the following procedure is performed:
1. The show ip cef [modem ip address] platform | i mac_rewrite_index command is run.
2. If the value displayed is greater than 64 k, the show cable modem service-flow verbose command is run.
Workaround: The correct version of the information displayed incorrectly by the service flow command can be obtained by manually obtaining the correct MRI (Step 1 described above), and then running the show pxf cpu qos mac [MRI] command.
Symptoms: Tracebacks occurs during the auto upgrade of DOCSIS Timing, Communication, and Control (DTCC) card firmware.
Conditions: This issue occurs on a firmware upgrade of the DTCC card.
Workaround: There is no workaround.
Symptoms: The show cable subscriber-usage command information is not displayed for a CM.
Conditions: This issue occurs when a CM is moved to another interface through load balancing.
Workaround: Use the dcc init-tec command instead.
Symptoms: The cable clock dti command does not work.
Conditions: This issue occurs when the system starts with two DTCC cards, and then one card is unplugged during run time.
Workaround: There is no workaround.
Symptoms: High latency (measured between the join and the multicast packets forwarded) is observed during Video over DOCSIS (VDOC) channel changes.
Conditions: This issue is seen on the universal broadband routers running Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
Symptoms: The Generic Routing Encapsulation (GRE) tunnel does not forward traffic.
Conditions: This issue occurs when a new GRE tunnel is created on a Cisco uBR10012 router.
Workaround: Execute the shutdown and no shutdown commands on the tunnel interface.
Symptoms: The debug output to the terminal is curtailed when logging discriminator is enabled.
Conditions: This issue occurs in Cisco IOS Release 12.2(33)SCB5.
Workaround: There is no workaround.
Symptoms: Flow control does not work on the ESR-HH-1GE interface of a Cisco uBR10012 router.
Conditions: This issue occurs on the ESR-HH-1GE interface of a Cisco uBR10012 router.
Workaround: There is no workaround.
Symptoms: It is not possible to configure the 5X1 Gigabit Ethernet port after swapping SPAs.
Conditions: This condition occurs after a 24rfchannel-spa-1 card is replaced with a SPA-5X1GE-V2 card.
Workaround: Reload the router or perform an OIR on the 24rfchannel-spa-1 card with another 24rfchannel-spa-1 card.
Symptoms: If the Stats, PHS, or BPI index table for the Cisco uBR-MC20X20V LC card fills up, the error is reported through the bug interface instead of an error message. This may not be seen on the PRE and may not be captured in the syslog servers if the PRE does not monitor the CLC messages.
Conditions: There are no known conditions for this issue to occur.
Workaround: Ensure that the CLC messages are monitored by the PRE and logged in the syslog server.
Symptoms: A crash may occur on the Cisco uBR10-MC5X20H line card.
Conditions: This issue occurs when the PRE module crashes because of an IPC timeout.
Workaround: There is no workaround.
Symptoms: The ccm ipv6_address rcs-counts command clears all the RCS counts of all the CMs instead of clearing the ipv6_address specified for the CM RCS counts.
Conditions: This issue occurs when the ccm ipv6_address rcs-counts command is executed.
Workaround: Use the ccm mac_address rcs-counts command instead.
Symptom: IPC tracebacks are observed in the system log.
Conditions: This issue occurs when the Line Card(LC) crashes and the IPC messages are still being sent to the LC from the RP.
Workaround: There is no workaround.
Symptoms: The CPE number displayed in the show cable modem and show cable modem registered command output do not match with the CPE number displayed in the show cable modem cpe and show cable modem ipv6 cpe command outputs.
Conditions: This issue is observed on the Cisco DPC3000 modem with a general IPv6 configuration.
Workaround: There is no workaround.
Symptoms: A message indicating that duplicate frequencies are configured on the integrated cable controllers is not displayed.
Conditions: This message must be displayed during the migration of the Cisco uBR10-MC5X20H line card to the Cisco UBR-MC20X20V line card.
Workaround: The downstream RF channel assignment must be mapped prior to migration.
Symptoms: The secondary port does not become active.
Condition: This issue occurs on a Cisco uBR10012 router with the Downstream External PHY Interface (DEPI) control plane configured.
Workaround: There is no workaround.
Symptoms: Static group and session are not created when static multicast group and source address exist in a CM configuration file.
Conditions: This issue occurs when you specify a static multicast group and source address in the CM configuration file.
Workaround: There is no workaround.
Symptom: The Cisco uBR10012 router with PRE4 pauses indefinitely.
Conditions: The issue is observed when the interrupts are disabled for 1000 to 2300 ms.
Workaround: There is no workaround.
Symptoms: Memory leak is observed on a Cisco uBR7200 series router.
Conditions: This issue occurs when a CM is reset after a reservation is created using RSVP.
Workaround: There is no workaround.
Symptoms: Excessive unicast and multicast packet loss is seen after a Wideband SPA switchover.
Conditions: This issue occurs on a Wideband SPA Gigabit Ethernet interface. The switchover takes 70 seconds to converge.
Workaround: There is no workaround.
Symptoms: The Wideband SPA does not perform Address Resolution Protocol (ARP) after the failure of the active port.
Conditions: This issue occurs under normal operating conditions.
Workaround: There is no workaround.
Symptoms: Modems cannot move out of penalty using the STM enforce rule.
Conditions: This issue occurs when the parameters configured in the modem configuration file override the reg service class of the STM. As a result, the reg static service class QoS template is not a subset of the admitted QoS template.
Workaround: Do not override the reg service class in the configuration file.
Symptoms: The line card crashes when a cable modem configuration file with the NominalGrantInterval value set to 100 is activated.
Conditions: This issue occurs on a Cisco DPC3000 modem with the NominalGrantInterval value set to less than 1000.
Workaround: Set a large value for the NominalGrantInterval.
Symptoms: The number of CPEs displayed in the show cable modem command output is incorrect.
Conditions: This issue is observed on an IPv6-enabled CPE.
Workaround: There is no workaround.
Symptoms: Tracebacks occur while toggling IPv6 on and off on the CPE.
Conditions: This issue occurs on a Cisco DPC3000 modem.
Workaround: There is no workaround.
Symptoms: The upstream-service-group is removed from the MAC domain after the line card and PRE switchover.
Conditions: This issue occurs after the Cisco UBR-MC20X20V line card and PRE switchover on Cisco IOS Release 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: PRC_CONFIG_CHANGE is returned instead of PRC_CONFIG_NO_CHANGE.
Conditions: This issue occurs when the cable admission-control ds-bandwidth and cable admission-control us-bandwidth commands are executed for the second time in either the global configuration mode or the interface configuration mode.
Workaround: There is no workaround.
Symptoms: The status of the IC or cable interface changes to Down when the status of the relative bundle interface is set to Down and the CMTS is reloaded.
Conditions: There are no known conditions for this issue to occur.
Workaround: Configure the interface using the shutdown command followed by the no shut down command.
Symptoms: PRE4 displays a high rate of IPC errors consistently.
Conditions: This issue is observed on an uBR10012 router running Cisco IOS Release 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: All CMs under a single upstream unexpectedly move to expire (pt) state.
Conditions: This issue occurs on a uBR10012 router running Cisco IOS Release 12.2(33)SCB3. The other upstreams on the same line card are not affected.
Workaround: The modems do not recover automatically. Run shut/no shut on the upstream to restore CMs.
Symptoms: The CPU utilization of the IGMP Input Process is very high while running simulation test patterns.
Conditions: This issue occurs when the legacy setup is configured without default service flow:
1. Five thousand legacy modems are created.
2. A simulation test is run with 5000 modems, 10 groups (or modems) and pps as 500.
Workaround: There is no workaround
Symptoms: A crash occurs on the line card at cmts_crane_read_key.
Conditions: This issue occurs when multicast service identifiers (SIDs) are configured on the line card and the show interface cable key command is executed.
Workaround: Do not configure multicast SIDs on the line card.
Symptoms: When cable dynamic-secret mark command is executed, CMs cannot get online until CMTS reloads.
Conditions: This issue is occurs when cable dynamic-secret mark command is configured. The modem configuration file is stored on the CMTS and is served by the CMTS TFTP server. This file is not read correctly, and hence the modems using that configuration file are not able to come online. The following log message is displayed:
Workaround: There is no workaround
Symptoms: Cable modem drops offline during an In-Service Software Upgrade (ISSU) procedure for line card upgrade.
Conditions: This issue occurs when the following procedure are performed:
1. An image is loaded to both the PREs.
2. A packet call is started after ensuring that all the modems are online.
3. After waiting until the next round of packet call (ensure that SID value is changed for dynamic UGS service flows), a PRE Switchover is performed.
4. After waiting until both the PREs are ready, a line card switchover and then a line card revertback are perfomed.
Workaround: There is no workaround.
Symptoms: The System Event Archive (SEA) console feature is enabled on PRE4.
Conditions: This issue occurs when the SEA feature is present in the IOS image.
Workaround: Delete the sea_console.dat file present in the PRE4 bootflash.
Symptoms: The following error message is logged as a high severity level error:
Conditions: This issue is observed when a router tries to overwrite the sticky ARP entry.
Workaround: There is no workaround.
Symptoms: A bus error may occur on a Cisco uBR10012 router running Cisco IOS Release 12.2(33)SCC.
Conditions: This issue occurs when a traceback displays that the SNMP getNext query is in progress for the MIB object docsIf3CmtsCmRegStatusEntry.
Workarounds: There is no workaround.
Symptom: The CMTS may stop forwarding traffic when it receives a broadcast packet or a IP packet with option MVPN MDT set inside.
Conditions: This issue occurs when invalid packets are received from MVPN MDT tunnel as broadcast packets or as packets with IPv4 option fields set.
Workaround: There is no workaround.
Symptom: Modems with a shaping rate configured cannot share the bandwidth according to their weights.
Conditions: This issue occurs when modular interface is shut down and then restarted while the traffic is being sent to modems.
Workaround: Stop traffic to modems during shutdown and restart of the modular interface.
Symptoms: The AC bucket array overflows and may corrupt the memory adjacent to the admission control array.
Conditions: This issue occurs when the following procedure is performed:
2. The CM has a service flow that is in provisioned state (25.6 : 1).
3. The DCC is performed on the CM by a test command or load balance
Workaround: Ensure that service flows are not in provisioned state (25.6 : 1). If they are, disable the load balance functionality.
Symptoms: The OIR upgrade from a Cisco uBR-MC5X20x line card to Cisco UBRMC20X20V line card fails when the DOCSIS mode is Annex A and a spectrum range of <5-65 Mhz> is configured.
The failure of the OIR upgrade is indicated through messages, and all the Cable interfaces are placed in the administratively down state.
Conditions: This issue occurs when the Annex mode is configured as Annex A on the downstream ports of a Cisco uBR-MC5X20x line card, and the upstream ports use the spectrum range of 5 to 65Mhz.
Workaround: The issue is due to the increased frequency range supported by Annex A <5 to 65Mhz> as compared to Annex B <5 to 55Mhz>. Because the upgrade fails due to increased spectrum range, it is advisable that the following procedure is performed:
1. Reduce the frequency range such that it is within the range <5 to 55Mhz> before upgrading the Cisco UBR-MC5X20x line cards.
2. Perform the switchover to the protect card, which should be a Cisco UBR-MC20X20 line card.
3. Upgrade the working Cisco uBR-MC5X20x line card to Cisco UBR-MC20X20 line card.
4. Revert back to the working card which was upgraded.
5. Change the frequency range to <5 to 65Mhz>
If a spectrum group is configured on a line card, perform the procedure explained in the following example:
Example: cable spectrum-group 1 band 27000000 65000000 configuration
1. Execute the cable spectrum-group 1 band 27000000 55000000 command.
2. Execute the no cable spectrum-group 1 band 27000000 65000000 command
3. Upgrade the Cisco uBR-MC5X20x line card. After the upgrade, execute the cable spectrum-group 1 band 27000000 65000000 command
4. Execute the no cable spectrum-group 1 band 27000000 55000000 command
Note Changing the spectrum group frequency range or the fixed frequency is not recommended because it can cause reassignment of frequencies on the upstream. As a result, modems can fall offline on all the cards using that spectrum group. It is therefore recommended that OIR upgrades be done in a maintenance window.
Symptoms: The Upstream Service Group (US-SG) disappears after Route Processor (RPs) switchover.
Conditions: This issue occurs if a fiber node is invalid because of Upstream RF Overlapping.
Workaround: There is no workaround.
Symptoms: Legacy Set Top Boxes (STB) with IOS release prior to 12.2, fail to work with IOS Release 12.2. IOS releases prior to 12.2 used ‘openCable2.0” for STB Virtual channel Identifier (VCI). In release 12.2, IOS changed STB VCI to “OpenCable2.0” to follow OpenCable's standard. This resulted in compatibility issues with legacy STBs.
Conditions: This issue occurs in legacy STBs that are still using VCI OpenCable2.0.
Workaround: There is no workaround.
Symptoms: The output of the show interface service flow counter command displays a wrong result.
Conditions: This issue occurs when the following procedure is performed:
1. Two group configurations (GCs) are configured with the same session range, but with a different type of service (ToS) and group QoS configuration (GQC). (An aggregate is used for one and single for the other.)
2. Two multicast traffic are sent with the session range in both GCs. Do not use ToS in either of them such that all traffic goes through the default service flow.
Workaround: This is a display issue and the actual traffic goes through the right service flow.
Symptoms: Narrowband CMs are dropped offline during an In-Service Software Upgrade (ISSU).
Conditions: This issue occurs when an ISSU is performed.
Workaround: There is no workaround.
Symptoms: Modular Card or Wideband Card or Gigabit Ethernet (MC/WC/GigE) interface reset occurs after 22 hrs of a 1500 packet cable call.
Conditions: This issue occurs when SPA is enabled on CMTS without switchover.
Workaround: There is no workaround.
Symptom: When Return Material Authorization (RMA) replacement of a Cisco uBR-MC20X20V
line card occurs, some downstream channels may come up as rf-shutdown, even though the previously functional line card in the same slot has the configurations using no rf-shutdown command.
As a consequence, CMs that were previously online might not be able to register successfully again, until a no rf-shutdown command is executed again on these channels. If LC HA is configured, the RMA would have caused an LC switchover. When an LC revertback occurs,, the channels will be shutdown and CM connectivity will be lost.
Conditions: This issue occurs on the RMA of a line card. This occurs only if a Cisco uBR-MC20X20V line card is ordered with a 0DS/5DS/license, and later upgraded by purchasing additional downstream licenses.
Workaround: The CLI command test hccp config resitriction disable can be used to allow no shutdown to be configured on the working standby before revertback.
Symptoms: The first line card does not get upgraded on the Cisco uBR10012 router.
Conditions: This issue occurs when performing Single-Step ISSU on the line card.
Workaround: Manually upgrade the first line card.
Symptoms: DOT1Q L2VPN traffic counters do not increment.
Conditions: This issue occurs when DOT1Q L2VPN is provisioned on CMTS, and L2VPN traffic is passing through L2VPN.
Workaround: There is no workaround.
Symptoms: When any service class configuration is changed, a CPU spike on the Route Processor (RP) is observed.
Conditions: This issue occurs when all the following conditions are met:
1. An operator makes a configuration change on a cable service class.
2. Debug cable tlv is turned on 3.
3. Any of the following three debugs is turned on:
– debug cable interface verbose
If any of these conditions is not met, this issue does not occur.
Workaround: Do not enable or perform the three conditions listed here at the same time.
For example, when the production box first boots up and no debug is configured, this issue will not occur when any change is performed to the service class configuration is done. Assuming the operator has turned on the first and second conditions on a production box, and if any changes are to be made to the service class later, simply turn off either the first or the second condition before making the change.
Symptom: The ESR-PRE2 card crashes after the Cisco uBR10-MC5X20H-X module crashes.
Conditions: This issue occurs on a Cisco uBR10012 router having a Cisco uBR10-MC5X20H line card.
Workaround: There is no workaround.
Symptom: When call volume is high, and numerous stop records are being generated by CMTS, it is observed that an invalid XML file gets generated occasionally.
Conditions: This issue occurs on the Cisco uBR7200 series and Cisco uBR10012 routers.
Workaround: There is no workaround.
Symptom: After PRE switchover, the streaming does not start on the secondary PRE. Also, in file mode, a new file is not created on the standby PRE.
Conditions: The issue occurs because PRE switchover causes SAMIS/IPDR to stop working.
Workaround: After PRE switchover, run the test cable metering command to start streaming (streaming mode) or create a file (file mode) on the standby PRE.
Symptoms: All CMs go offline when wideband line card crash.
Conditions: This issue occurs when there is double failure, that is, there is a switchover from a working LC to a protected LC by using CLI, and simultaneously, the protect LC crashes or is reset, or vice versa.
Workaround: Reset both the working LC and the protect LC.
Symptoms: The DOCSIS MAC Infrastructure upstream_channel_id safety net performs some false checks. It should be turned off.
Conditions: There are no known conditions for this issue to occur.
Workaround: There is no workaround.
Symptom: After PRE switchover on Cisco uBR10012 router, an error message is displayed indicating that the IPC message received has inconsistent header data.
Conditions: This issue occurs on a Cisco uBR10012 router after PRE switchover.
Workaround: There is no workaround.
Symptoms: Ping command fails for a wideband modem hosted on Cisco uBR-MC20X20V LC after several PRE switchovers.
Conditions: This issue occurs when different bonding group IDs are on active and standby PRE.
If a bonding group ID that is configured for a wideband interface is already being used by another wideband interface, the active PRE will reject this new value with the following message:
However, the standby PRE accepts this new value. Thus, different bonding group IDs get configured on active and standby PREs, causing the ping command to fail.
Workaround: Reconfigure the bonding group ID correctly. Check if each wideband interface has the same bonding group ID on active and standby PRE. It this is not the case, reset standby PRE.
Symptom: The subinterface CLI command downstream local upstream is missing for a Cisco uBR10-MC5X20 cable interface line card in IOS release 12.2(33)SCD.
Conditions: There are no known conditions for this issue to occur.
Workaround: There is no workaround.
Symptoms: All the line cards crash because of the Dynamic Host Configuration Protocol Daemon (DHCPD) receive process. The CPUHog messages are also displayed because of the same process.
Conditions: This issue occurs on a Cisco uBR10012 (PRE4-RP) Universal Broadband Router running Cisco IOS Release 12.2(333)SCB5.
Workaround: There is no workaround.
Symptoms: The CMTS may not reject the REG-REQ that includes invalid DOCSIS QoS classifiers.
Conditions: This issue occurs when the CM configuration file contains both IPv4 fields (other than TCP or UDP source or destination ports) and IPv6 fields in one DOCSIS QoS classifier.
Workaround: There is no workaround.
Symptoms: Modems cannot go w-online after all the CLCs are reset.
Conditions: This issue occurs when there are two working CLCs, CLC1 and CLC2, in a hccp group. The protect CLC protects the working CLC1 before reset or power off. The working CLC2 then boots up before the working CLC1, and the working CLC2 gets the wrong downstream service group data. The same issue is observed when there are more than two working CLCs.
Workaround: Reset all the CLCs, and the working CLC which is protected earlier should boot up first.
Symptoms: The CMs lose connectivity periodically on the Cisco UBR-MC20X20 line cards. An outage is caused when the default TEK life-time interval is configured in the MAC domain.
Conditions: This issue occurs during normal operation, and is caused by a problem decrypting the upstream traffic when the modem uses the key sequence 15 to encrypt the traffic.
Workaround: There is no workaround.
Symptoms: There is a mismatch of the BPI index between the cable line card and the remote SPA.
Conditions: This issue is seen when a line card is running with no redundancy, and the guardian line card is rebooted. When the guardian line card is restarted, the unique indexes that are used to program the SPA are lost and are overwritten by new modems coming online. Two modems now share the same SPA keying index, and either one of these modems can become Layer 3 unreachable, depending on when the keys are written to the SPA.
Workaround: When the guardian card is rebooted, all the modems on the line cards using that guardian should be reset. The reset ensures that the modems have unique indexes to program the SPA.
Also, ensure that the guardian line card is running with redundancy.
Symptoms: Rollback fails for the cable admission-control us-bandwidth bucket-no minor major exclusive command.
Conditions: There are no known conditions for this issue to occur.
Workaround: There is no workaround.
Symptoms: The ISSU command issu changeversion image_name takes a wrong standby image path.
Conditions: This issue occurs when the issu changeversion (short CLI) command is used for ISSU, and the image path is not given.
Workaround: Provide the complete name and path of the image when using a short CLI.
Symptoms: After a PRE failover, wideband modems are dropped offline on multiple downstreams.
Conditions: This issue is seen on the Cisco uBR10012 Universal Broadband Routers on PRE-2 running Cisco IOS Release 12.2(33)SCB.
Workaround: Delete the fiber node configuration and reconfigure it.
Symptoms: Prioritized traffic in a downstream service flow is delayed for a few seconds.
Traffic in a service flow with a shape rate (maximum sustained rate in non-ERBA mode, or peak rate in an ERBA mode) less than 50 Kbps may suffer a delay of a few seconds. Because such a low shape rate has been used by customers for voice signaling flows, symptoms such as intermittently long delays in getting a dial tone, or not getting dial tone at all, may occur.
Because the voice signaling traffic is low in volume, the problem may not cause packet tail drop in most cases. The packets will only experience excessive delay in the service flow queues. Furthermore, the short timeout between voice signal packet retransmission time may sometimes exacerbate the problem.
Conditions: This issue is likely to be triggered when a flow has low shaping rate (lower than 50Kbps), and a packet in that service flow arrives a few minutes after the previous packet.
Workaround: Avoid using low shaping rate. Use shaping rate of 100 Kbps or above, or no shaping at all.
Note Even though voice flows tend to have a very low rate, using a higher shaping rate does not have a negative impact, because the bandwidth not used by the flow in question can always be consumed by other flows. Furthermore, using a high shaping rate reduces the voice signaling flow's latency, which is desirable.
Symptom: Spurious memory access tracebacks are observed on CMTS.
Conditions: This issue occurs when the cable admission-control ds-bandwidth/us-bandwidth command is executed.
Workaround: There is no workaround.
Symptoms: A Cable Line Card running Cisco uBR10012 running IOS Release 12.2(33)SCB5 may crash, when using the debug cable mac-protocol command and DCC.
Conditions: There are no known conditions for this issue to occur.
Workaround: Disable debug cable mac-protocol command.
Symptoms: Cable modem subscribers experience one-way Real-Time Transport Protocol (RTP) traffic.
Conditions: This issue is seen on a Cisco uBR10012 Universal Broadband Router running the Cisco IOS Release 12.2(33)SCB4 or Cisco IOS Release 12.2(33)SCB5, with at least 2 gigabit uplinks towards the core.
Workaround: Perform one of the following:
2. Remove one of the Gigabit uplinks.
3. Perform a microcode reload.
Symptoms: The MAC domain cable interface is configured to shutdown after the card has been powered off with the hw-module subslot command. However, when the card is powered on by the no hw-module subslot command, the shutdown configuration is missing when the interface comes up.
Conditions: There are no known conditions for this issue to occur.
Workaround: After the card is powered up, configure the MAC domain cable interface to shutdown again.
Symptoms: The output of docsIFCMtsModulationTable MIB and the show cable modulation-profile verb command is inconsistent.
When SNMP query is performed on the MIB object docsIFCMtsModulationTable, the values of docsIfCmtsModByteInterleaverDepth, docsIfCmtsModByteInterleaverBlockSize, and docsIfCmtsModChannelType objects is different from the show cable modulation-profile verb CLI output.
Conditions: This issue occurs on a Cisco uBR10012 router running IOS release 12.2(33)SCC.
Workaround: Refer to the output of the show cable modulation-profile verb command for accurate values.
Symptoms: When the line card is reverted from the protect mode to the working mode, it crashes the PRE and the working line card.
Conditions: This issue occurs on a Cisco uBR10012 Universal Broadband Router running Cisco IOS Release 12.2.(33)SCB4, with PRE-A switched to PRE-B, and the Cisco CMTS using the protect card in slot 5/1.
Workaround: There is no workaround.
Symptom: The CAM entry for the IPv6 multicast is missed.
Conditions: This issue occurs when both IPv6 and IPv6 multicast routing are enabled on a GE interface.
Workaround: Disable the IPv6 multicast routing.
Symptoms: Tracebacks are observed on the CMTS router.
Conditions: This issue occurs under the following conditions:
– When trying to create a Group Configuration (GC) using only the group priority field alone
– When trying to change either the group prefix length or source prefix length without specifying the group or source prefix.
Workaround: To create a GC, ensure that the group priority and row status are mentioned in the same query.
Symptom: When configuring an uBR platform with ISIS, the internal IPC Ethernet address 127.x.x.x is advertised even when no service internal is configured.
Conditions: This issue is observed because the no isis advertise prefix interface command prevents ISIS from advertising an interface's IP address. However, in this case, the IPC interface cannot be configured by the end user. Due to the nature of the Ethernet loopback address, it should never be advertised by an IGP.
Workaround: There is no workaround.
Symptoms: DOCSIS 3.0 CMs go offline after the SPA GigE link detects loss of signal when fiber is unplugged.
Conditions: There are no known conditions for this issue to occur.
Workaround: Use the redundant SPA GigE link for backup.
Symptoms: Upstream (US) traffic may exceed the peak-rate configured in service class in non-mtc mode.
Conditions: This issue is observed when peak-rate is configured for DOCSIS2.0 service flows, the US traffic may exceed peak-rate occasionally. If a very small peak-rate with a very large max-traffic-burst is configured for DOCSIS3.0 service flow, the US traffic may also exceed peak-rate occasionally.
Workaround: There is no workaround.
Symptoms: A traceback is observed on the Cisco uBR7200 router.
Conditions: This issue is observed when the CM fails registration, and the clear cable modem all delete command is executed.
Workaround: There is no workaround.
Symptom: The following error message is displayed during OIR when any interface on the line card being powered down is configured with spectrum management.
Due to this, error the standby PRE's upstream spectrum data does not get updated properly. Also the output of CLIs such as show cable spectrum-group and show cable fiber-node spectrum is inconsistent between the active and standby RP as well as the standby RP and LC.
Conditions: This issue occurs when PRE HA is configured. A spectrum group must be assigned to at least one interface on the LC.
Workaround: Force a change in the spectrum band for the upstream channels whose information is out of sync on the standby RP, until the UBR10K_REDUNDANCY-4-RP_HA_STDBY_INCONSISTENT event occurs again.
Symptom: CMTS PEAK-OFFPEAK STATS memory leak is observed in the line card.
Conditions: This issue is observed when the STM enforce rule is configured first and then removed.
Workaround: There is no workaround.
Symptoms: A crash occurs on a Cisco uBR10012 router running IOS release 12.2(33)SCB5 with PRE-4.
Conditions: This issue occurs when the show cable modem ip service flow verbose command is executed several times.
Workaround: Delete the fiber node configuration and reconfigure it.
Symptoms: Line card-to-line card inter-process communication (IPC) may go down.
Conditions: This issue occurs when the line card CPU is heavily loaded. This delays the line card-to-line card IPC connect, causing a timeout. This is only a potential problem, and has not been directly observed either on IOS Release 12.2(33)SCC or IOS Release 12.2(33)SCD.
Workaround: If a redundant PRE is present and is in SSO, a PRE switchover will force the line cards to re-establish the IPC.
Symptoms: A modem with an UGS flow lags behind due to inconsistent packet transmission.
Conditions: This occurs with Cisco IOS Release 12.2(33)SCC2 on a Cisco UBR-MC20X20V cable interface line card when the UGS flow sends a QI bit in a message, and the QI bit is not processed, resulting in the modem lagging behind on the UGS flow.
Workaround: There is no workaround.
Symptoms: The following error message occurs on the CMTS console:
Conditions:. This issue occurs when the CMTS is idle, and 13 hrs prior to this error a ~1500 dual-stack CPEs is brought online and then torn down.
Workaround: There is no workaround.
Symptoms: Bandwidth is not shared evenly between the DOCSIS 2.0 CMs and the DOCSIS 3.0 CMs.
Conditions:. This issue occurs when DOCSIS 2.0 modems flow on upstream 0, and DOCSIS 3.0 modems flow on upstream 0 (US0) and upstream 1 (US1). US0 is fully utilized, but not US1.
Workaround: There is no workaround.
Symptoms: In a setup with multiple BE service flows, the service flows having either a committed information rate (CIR) or having a minimum rate configured, receive bandwidth upto its maximum rate if the bandwidth is available.
Conditions: This issue is observed in a setup with mixed BE service flows, with some service flows configured with a minimum rate. If the maximum rate of the CIR flow is higher than its minimum rate, this issue occurs.
Workaround: Most CIR flows are provisioned with the maximum rate close to if not identical to the minimum rate. If a high maximum rate for the CIR flow is not required, configure the maximum rate such that it is close to the minimum rate.
Symptoms: Unexpected values are observed in activity-based Weighted Fair Queuing (WFQ) aggregated throughput.
Conditions: This issue is observed when the number of flows are equally distributed among priority and activity-based WFQ. The aggregated throughput for each priority does not meet the configured weight.
Workaround: Use class-based WFQ.
Symptoms: The following error message is displayed on the Cisco CMTS:
Conditions: This issue occurs when the following scenario occurs:
1. There is an IPv6 CPE in the chassis.
2. Load balance and DCC have moved the CPE from one MAC-Domain to another MAC-Domain with DCC init tech >=1.
3. The DCC fails, and the CPE comes back online from the original MAC-Domain.
Workaround: There is no workaround.
Symptoms: After UCC, the output of the show cable modem verbose command displays a message stating that the codeword counter is reset. However, the output of the show interface sid counter verbose command does not display the correct status (reset) of the codeword counter.
Conditions: This issue occurs when the UCC is enabled.
Workaround: There is no workaround.
Symptoms: The Cisco CMTS router crashes when the SNMP client was queries the docsIf3CmtsCmRegStatusEntry MIB object.
Conditions: This issue occurs on a Cisco uBR10012 router running 12.2(33)SCC2 with tracebacks associated with SNMP polling.
Workaround: Use docsIfCmtsCmStatusTable instead of docsIf3CmtsCmRegStatusEntry for CM-related information.
Symptoms: Some CMs get stuck in the reject(pk) state when connected to a UBR-MC20X20V line card.
Conditions: This issue occurs when the certificate of the CM does not conform to the IETF standards.
Workaround: Move the CMs to a 5x20 line card.
Symptoms: The downstream service flow counter is cleared when a modem drops offline even if the CMTS is configured with the cable primary-sflow-qos11 keep all command.
Conditions: This issue occurs in a Cisco uBR10012 routers with Cisco uBR10-MC88V and UBR-MC20X20V line cards, and running Cisco IOS Release 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: CM subscribers report robotized voice quality during the following events:
– Detection of JIB MAC DS lockup issue. All the modems on the MAC domains (cable interfaces) that are associated to a single JIB MAC are offline.
– Robotized voice is reported by the cable modem on all the other operational cable interfaces.
– Low throughput UGS flow is observed when the show interface service-flow verbose | i packet command is executed on all the other operational cable interfaces.
Conditions: The robotized voice is a side effect of JIB DS lockup. However, the condition that triggers the JIB DS lockup is unknown.
Workaround: When the JIB DS failure occurs, reload the cable line card to recover. After the recovery, perform the following procedure as a temporary workaround to lessen the impact of the robotized voice quality:
1. Either shut down the MAC domains (cable interfaces) that are associated with the failed JIB, or individually shut down all the upstreams of the MAC domains.
2. Provision the CMTS to disable the PacketCable DQoS, and use best effort flows for voice-bearer traffic. This method will improve the voice quality only when the upstream is not congested.
Symptom: If a dual-stack is CPE online, the clear cable host x.x.x command causes the corresponding line card to crash.
Conditions: This issue occurs when the CPE is online with both the IPv6 address and the IPv4 address.
Workaround: There is no workaround.
Symptom: The output of the show cable modem <interface> upstream x offline command does not display anything:
Conditions: This issue occurs when the <interface> option is entered in the show cable modem <interface> upstream x offline command. CLC type is independent.
Workaround: There is no workaround.
Symptoms: On a Cisco uBR10-MC5X20H line card, aggregated throughput may exceed the configured value. Aggregated throughput is configured using the cable upstream rate-limit-ccf aggregated-throughput aggregated-burst command.
Conditions: This issue is observed because the bandwidth requests for the service flows with the peak rate configured are not throttled.
Workaround: There is no workaround.
Symptom: Multiple grants per interval may not work.
Conditions: This issue is observed in IOS Release 12.2(33)SCD, SCC and SCB uBR image with PCMM and PS, which is doing Multiple grants per interval (MGPI) task.
When there are 24 line MTA, ATA or any other kind of device capable of making 24 calls behind one CM, MGPI is performed. With MGPI, the CMTS will get an additional classifier for every call that gets added to the same gate. Thus the nth call will have n classifiers in the Gate-Set message. When a Gate-Set is received with multiple classifiers in it, the CMTS will ignore all the classifiers, except the last one in the list. This will result in call failure of all n-1 calls.
Workaround: There is no workaround.
Symptoms: The CPE entries are not removed when the modem is disconnected.
Conditions: This issue occurs when the following procedure is performed:
1. The modem and the PC(CPE) are connected.
2. The output of either the show cable modem cpe or the show interface modem command displays the PC MAC address behind the modem.
3. The modem and the PC(CPE) are disconnected.
4. After a few minutes, the modem is reconnected without the PC(CPE).
5. The output of either the show cable modem cpe or the show interface modem command still shows the PC behind the modem, along with the PC's ARP entry. Wait until the PC's ARP entry disappears.
6. The output of either the show cable modem cpe or the show interface modem command still reports the CPE entry behind the modem.
Workaround: Delete the modem using the clear cable modem mac address delete command.
Symptom: Memory leak is observed when more than 21 profiles are configured in a policy map.
Conditions: There are no known conditions for this issue to occur.
Workaround: There is no workaround.
Symptoms: DOCSIS 3.0 CM may boot in partial mode.
Conditions: This issue occurs when a DOCSIS 3.0 modem is booted with a US BG-capable CMTS. The modem may or may not boot in partial mode.
Workaround: Use power cycling to resolve the issue. However it is not guaranteed that it will clear the partial mode.
Symptoms: Flapping BGP sessions occur in the network when a Cisco IOS application sends full-length segments with TCP options.
Conditions: This issue is seen when a Cisco IOS device that is configured to send TCP options sends its initial Maximum Segment Size (MSS) during the three-way handshake. In this case, the router incorrectly accounts for 20 bytes of TCP options when it sends this initial MSS
This issue occurs when a fixed IOS communicates with a non-fixed IOS.
Note The non-fixed behavior is to subtract the 20 TCP option bytes when MSS values are initially exchanged.
The fixed behavior is to not subtract the 20 TCP option bytes when MSS values are initially exchanged.
Workaround: Set the MSS value on the non-fixed router to be the MSS received from the fixed router minus the TCP options (20 bytes). Use the global command ip tcp mss to adjust the MSS value that the router will use.
Symptoms: Some CMs may go offline during a line card switchover.
Condition: This issue occurs during a switchover of a protect Cisco uBR10-MC5X20H line card and a working Cisco uBR10-MC5X20U line card.
Workaround: Reduce the number of modems connected to the Cisco uBR10-MC5X20U line card.
Symptoms: The accumulated timing offset of a modem goes to a negative value. The following error message is displayed on the CMTS:
Conditions: This issue occurs on the Cisco uBR10-MC5X20 line card.
Workaround: There is no workaround.
Symptoms: The show inventory command output is not displaying the secondary PRE on an uBR10012 router.
Conditions: This issue occurs on an uBR10012 router running Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
Symptoms: When VPN routing and forwarding (VRF) and tunneling is configured, the output traffic rate through the tunnel interface does not exceed 4 Kbps.
Conditions: This issue occurs when the destination IP of the tunnel interface belongs to non-global VRF and the traffic direction is outgoing.
Workaround: Make sure that the destination IP address of the tunnel interface belongs to global VRF, and not to a specific VRF.
Symptoms: The CNR value goes down with added noise. Even if the noise is removed the value continues to remain the same.
Conditions: This issue occurs when the noise is removed and 75% of the traffic is utilized on a robust modulation profile.
Workaround: Reduce the traffic.
Symptoms: The DOCSIS 3.0 CM goes offline after issuing the test cable dcc command with a ranging technique of 1.
Conditions: This issue occurs when the test cable dcc command is issued with a ranging technique of 1.
Workaround: There is no workaround.
Symptom: An Upstream Channel Descriptor (UCD) CCC message appears for each upstream port on the protect line card when the protect card is configured based on one of the working line cards with the member subslot protect config command. This message should not appear for the protect card.
Conditions: This issue occurs when the protect card is configured based on one of the working line cards with the member subslot protect config command.
Workaround: No specific workaround. The warning message does not have any impact on normal functionality.
Symptoms: When CPU utilization is very high (around 99%), a false alarm is generated with the following error message:
Conditions: This issue occurs when hundreds of Cisco EPC3000s CMs are connected to the Cisco uBR-MC88V LC, and half of these CMs are flapping. When the show memory debug leak chunk command is executed on LC, high CPU utilization is indicated with the following error message being displayed on the console multiple times:
Workaround: There is no workaround.
Symptoms: The standby PRE is reset after the working and protect uBR-MC20X20V cable line cards are reset at the same time.
Conditions: This issue occurs on a Cisco uBR10012 router when the working and protect uBR-MC20X20V cable line cards are reset at the same time.
Workaround: There is no workaround, but there is no service impact after standby PRE reset.
Symptoms: The route processor crashes when polling for cefFESelectionEntry.
Conditions: This issue occurs when the following procedure is performed:
1. From the global configuration mode, the bundle is removed using the no interface bundle x command.
2. The cable interface is configured using the interface cable x/y/z command.
3. From the cable interface configuration mode, the bundle is added back using cable bundle x command.
4. The IP address and other parameters are configured for the bundle interface.
5. A query is run for the cefFESelectionEntry.
The router crashes following the query.
Workaround: Configure a new bundle with a different bundle index. Do not reuse a removed bundle.
Symptoms: Multicast data traffic is not forwarded to the VRF group.
Conditions: This issue occurs when a Multicast Virtual Private Network (MVPN) is set up.
Workaround: There is no workaround.
Symptom: The DOCSIS 3.0 General Load Balancing Group (GLBG) on a protect card continues to exist even after a revertback.
Conditions: This issue occurs when the following procedure is performed:
1. A switchover occurs from the line card interface switchover cable 8/0 to cable 5/0.
2. A revertback occurs from cable 5/0.
Workaround: There is no workaround
Symptoms: The CMTS crashes due to a bus error.
Conditions: This issue occurs only when the PRE is out of memory.
Workaround: There is no workaround.
Symptoms: Cannot capture the downstream packets on a SIP 600 with a 24 RF channel-spa-1 in bay 1 or bay 2 using a cable monitor.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
Symptoms: The modulation profile’s preamble length for internal usage code (IUC) types, station, and initial becomes very large.
Conditions: This issue occurs on the uBR10012 routers with uBR10-MC5X20H-D and UBR-MC20X20V-D line cards on Cisco IOS Releases 12.2(33)SCC and 12.3(23)BC.
Workaround: Use a different modulation profile.
Symptoms: The service unsupported-transceiver configuration on a PRE4 is not available.
Conditions: This issue occurs only on a PRE running Cisco IOS Releases 12.2(33)SCB5, 12.2(33)SCC, and 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: All CMs on adjacent downstreams (0 and 1, or 2 and 3, or 4) are offline.
Conditions: The downstream ports that share JIB may be nonfunctional if the JIB that services both the downstream ports are locked.
Workaround: Reload the line card.
Symptoms: Layer 2 VPN configuration with BPI configuration fails on the Cisco uBR10012 router.
Conditions: This issue occurs when both Layer 2 VPN and BPI are configured.
Workaround: There is no workaround.
Symptoms: The wideband SPA becomes unusable after a BLAZE SPI interrupt. All the CMs using SPA downstreams go offline.
Conditions: There are no specific conditions for this issue to occur.
Symptoms: The Cisco UBR-MC20X2V line card may crash when it receives an invalid bandwidth request.
Conditions: This issue occurs when an error condition in which the CMTS can receive a bonded request from an invalid SID exists, thus causing the line card crash.
Workaround: There is no workaround.
Symptoms: The output of the show diagnostic ood-status command does not give correct information pertaining to the SPAs and the DTCC cards.
Conditions: This issue is seen when running the Cisco IOS Release 12.2(33)SCB4.
Workaround: There is no workaround.
Symptoms: The Spumoni uptime output does not include CP utilization.
Conditions: This issue is seen when you use uptime on the Spumoni SPA card.
Workaround: There is no workaround.
Symptom: "%SYS-2-BADSHARE: Bad refcount in pak_enqueue" type of tracebacks are seen in the PRE module running Cisco IOS Release 12.2(33)SCC1.
Conditions: This issue occurs when a particle-based packet is pushed into the toaster by the PRE module.
Workaround: There is no workaround.
Symptoms: The line card reloads due to an error when Layer 2 VPN is configured on a CM.
Conditions: This issue occurs in CMs when Layer 2 VPN is configured and Baseline Privacy Index (BPI+) is not configured.
Workaround: Configure BPI+ on CMs with Layer 2 VPN configurations.
Symptoms: After the active PRE crashes, some modems cannot get online after the switchover.
Conditions: This issue occurs when the protect line card is active and some modems are online on that cable line card (CLC) before the PRE switchover.
Workaround: Revert back from the protect CLC to the working CLC.
Symptoms: The Cisco uBR10012 router delays the response to an SNMP client, causing an ongoing SNMP polling timeout.
Conditions: This issue occurs in Cisco uBR10012 routers running PRE2 while polling either the ccwbWBCmStatusTable or ccwbWBCmStatusExtTable MIB objects. This issue occurs when many narrowband modems are online, but these modems do not include a wideband modem.
Workaround: Either increase the SNMP timeout used by the Network Management Applications or either exclude the ccwbWBCmStatusTable or the ccwbWBCmStatusExtTable by configuring the SNMP view:
Symptoms: The output of the MIB object docsDiag is not complete when the number of CMs in error state is greater than 30.
Conditions: This issue occurs when diaglog is configured.
Workaround: There is no workaround.
Symptoms:A CM fails to receive the Ranging-Response (RNG-RSP) message.
Conditions: This issue occurs when the CMTS detects that a CM has performed initial ranging on an upstream or downstream pair that are not within the same MAC domain.
Workaround: There is no workaround.
Symptoms: The SAMIS and IPDR record displays junk value for the field CMTSupIfName for the multicast service flow.
Conditions: This issue occurs when a multicast service flow exists, and SAMIS/IPDR is enabled.
Workaround: There is no workaround.
Symptoms: SAMIS/IPDR does not export deleted multicast service-flow.
Conditions: This issue occurs when deleted multicast service flow exists, and SAMIS/IPDR is enabled.
Workaround: There is no workaround
Symptoms: An IPv4 cable modem with an IPv6 CPE does not forward IPv6 multicast traffic because theCisco CMTS has not provided the list of DSIDs in the registration.
Conditions: This issue occurs when a CM is IPv6 compliant with an IPv6 CPE.
Workaround: There is no workaround.
Symptoms: The Secondary PRE is reset due to parser return error after the secondary collectoror associate on the IPDR config is added or deleted.
Conditions: This issue is observed when ipdr session stop command is executed on the active PRE, followed by addition/deletion of secondary collector/associate on IPDR config.
Workaround: Execute the ipdr session stop command on both the active PRE and the standby PRE.
Symptoms: The following error message is displayed on the standby PRE after the Cisco Call Manager (CCM) is deleted:
Conditions: This issue is observed in Cisco uBR10-MC20X20 protecting the Cisco uBR10-MC5X20 line card setup, when modems on the 5X20 working card are turned offline and are removed by the clear cable modem delete command.
Workaround: Ignore the error message.
Symptom: SCDMA channel bonding (four channels of 64QAM and 6.4 MHz) throughput does not work with the following SCDMA parameter:
– Spreading Interval per frame = 4
– Packet size is greater than 1350 bytes per packet
Condition: The conditions are the same as described in Symptome.
Workaround: There is no workaround.
Symptom: The ISSU Compatibility Matrix shows that Cisco IOS Releases 12.2(33)SCC1 to 12.2(33)SCC2 is Base-compatible instead of Compatible, when the system continues to run in SSO mode after the IOS Release 12.2(33)SCC1-12.2(33)SCC2 ISSU upgrade or downgrade.
Conditions: This issue occurs after a new software licensing feature is introduced on uBR10-MC20X20 line card.
Workaround: There is no workaround. Being Base-compatible does not affect the ISSU operation to reach SSO.
Symptoms: The Cisco uBR10-MC5X20H-D cable line card displays incorrect software platform version group when the show version command is run on either the line card or on the MIB walk.
Conditions: This issue is seen on the Cisco uBR10012 Universal Broadband Router while executing either the show version command or MIB walk.
Workaround: There is no workaround.
Symptoms: The Cisco UBR-MC20X20V cable interface line card may crash due to jib3us detecting a fatal interrupt.
Conditions: This issue occurs on a Cisco uBR10012 router running Cisco IOS Release 12.2(33)SCC1 when a non-DOCSIS compliant cable modem sends fragmented packets.
Workaround: There is no workaround.
Symptoms: The Cisco uBR7200 router may hang after the cable upstream privilege configuration CLI is executed.
Conditions: This issue occurs when privilege cable upstream CLIs are executed on the CMTS.
Workaround: There is no workaround.
Symptoms: Cisco uBR10-MC20X20 protecting Cisco uBR10-MC5X20 redundancy preconfig does not take effect after adding the uBR10-MC20X20 working member.
Conditions: This issue occurs when a user has Cisco uBR10-MC20X20 protecting the Cisco uBR10-MC5X20 preconfig on the existing running-config, and adds one 20X20 as the new working LC.
Workaround: Reset the protect line card that triggers the HCCP state machine reinitialization.
Symptoms: Repeated ECC error messages on PRE-4 cause 100% CPU and service interruption.
Conditions: This issue occurs when repeated ECC errors occur.
Workaround: Remove the line card reporting the errors to prevent service interruption.
Symptoms: Load sharing of Multiprotocol Label Switching (MPLS)/Virtual Private Network (VPN) does not happen on the upstream router direction even though the paths have the same cost to reach a particular destination.
Conditions: This issue occurs when the MPLS or VPN is configured on a bundle interface, and the MPLS is configured on the links to the upstream router.
Workaround: There is no workaround.
Symptoms: Connectivity issues occur in the outbound interface on the Cisco uBR10012 router (either cable or WAN) due to a stuck pxf queue. The modems may get stuck in init (io).
Conditions: This issue occurs when the interface default queues are deleted as a result of the no card command on a Cisco uBR10012 router running Cisco IOS Release 12.2(33) SCB, Cisco IOS Release 12.2(33) SCC, or Cisco IOS Release 12.2(33) SCD.
Workaround: After executing the no card command, perform two PRE switchovers.
Symptoms: The CMTS does not send an override message when the MAC domain port number is not 0.
Conditions: This issue occurs when the Downstream Frequency Override (DFO) RF topology is setup on the Cisco UBR-MC20X20V cable interface line card.
Workaround: There is no workaround.
Symptoms: Core temperature readings are incorrect.
Conditions: This issue is seen on the Cisco uBR10012 Universal Broadband Router with PRE2/3/4 running the Cisco IOS Release 12.2(33)SCB and later.
Workaround: There is no workaround.
Symptoms: The RecType field is set to a wrong value when the template is DIAGLOG-DETAIL, and the session type is event.
Conditions: This issue occurs when the configured IPDR session type is event, set using the configure ipdr type event command, and the IPDR schema is DIAGLOG-DETAIL, set using the configure ipdr template DIAGLOG-DETAIL command.
Workaround: There is no workaround.
Symptom: When configuring sampling rate or duration for an enforce rule, a check is present on the CLI to ensure that the duration is greater than the sample rate. This check is absent when these values are set via the MIB.
Condition: This issue occurs because the rule that the monitoring duration must be greater than the sampling rate for a legacy enforce rule is not strictly enforced by MIB.
Workaround: Configure via CLI.
Symptoms: Changing the service class parameters on a CM results in messages not getting passed to the PRE.
Conditions: This issue is seen on the Cisco uBR10012 Universal Broadband Router running Cisco IOS Release 12.2(33)SCB4.
Workaround: Execute the cable modem service-class-name command from the cable line card.
Symptoms: On a Cisco uBR-MC20X20V LC, Downstream Frequency Overriding (DFO) debug messages are not displayed in the log, even though the RF topology is configured for DFO.
Conditions: Because the MD-DS-SG ID is generated based on the MAC domain, there may be different MD-DS-SG IDs for two MAC domains if the same downstream RF channel set is configured under two fiber-nodes. If a CM sends the ranging request to the wrong downstream, the CMTS tells the CM to abort ranging. Because no DFO processing takes place, no logs are displayed.
Workaround: Remove the two fiber nodes configuration, and configure them again.
Symptoms: The CMs become unreachable even if they are in the online(pt) state.
Conditions: This issue occurs with the Cisco UBR-MC20X20V or Cisco uBR-MC88V cable interface line card when a modem moves within the same MAC domain using load balancing or the test cable dcc command with DCC profiles 1-4.
Workaround: Perform one of the following:
– Use DCC 0 for load balancing, which forces the modems to reregister before completing the move. Load balancing does not move modems that have active voice calls. The test cable dcc command moves the modem even if it has active voice calls.
– Disable BPI. This eliminates the need to move the keying information to the new channels.
– Disable load balancing. This ensures that the modem remains in online(pt) and does not move to a new channel.
Symptoms: The cable metering ipdr session command does not configure successfully if usage-based billing and streaming of billing records to an external server is already configured.
Conditions: This occurs when the following procedure is performed:
1. The cable metering destination nonsecure command is configured on the CMTS.
2. The cable metering ipdr session command is configured with the same time interval and session ID.
Workaround: Execute the no cable metering destination nonsecure command first.
Symptoms: The IN/OUTPkts counter is zero in ifMIB.
Conditions: This issue occurs on the Cisco uBR10012 router running Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
Symptom: The PRE2 module is not able to boot up when PXF crashed.
Conditions: This issue is occurs on a Cisco uBR10012 router running IOS release 12.2(33)SCD.
Workaround: There is no workaround.
Symptom: The maximum character length for the VRF name is 32 characters. When configuring the VRF parameter for the divert rate limit trusted sites, the command accepts 32 characters. However only 31 characters are displayed in the running configuration and in the output of the show pxf cpu drl-trusted-sites command.
Also, the CMTS CLI accepts the entering of the same divert-rate-limit trusted-sites command multiple times when using the same 32 characters for the VRF name.
Conditions: This issue is seen when configuring a 32-character length VRF name using the divert-rate-limit trusted-sites command.
Workaround: There is no workaround.
Symptom: Multiprotocol Label Switching (MPLS) Business Services over DOCSIS (BSoD) needs to convert user priority to MPLS exp range in CM config file TLVs. However the show pxf command does not support this.
Conditions: This issue occurs when the following procedure is performed:
2. In CM config file, user priority is set instead of MPLS exp range.
Workaround: There is no workaround.
Symptoms: The upstream-service-group gets removed from the CMTS.
Conditions: This issue is observed when the Cisco UBR-MC20X20V cable interface line card switchover occurs more than three times, or when the Cisco UBR-MC20X20V cable interface line card switchover occurs, followed by the RP switchover.
Workaround: Do not let the condition described under Conditions occur.
Symptoms: Modems on the Cisco UBR-MC20X20V cable interface line card become unreachable after load balancing between different ports on the SPA using DCC tech 1-4.
Conditions: This issue occurs only with DCC tech 1-4. It does not occur when the modem is forced to reregister and reauthenticate.
Workaround: Use load balancing in conjunction with DCC tech 0.
Symptoms: Cable modems do not respond to layer 3 pings.
Conditions: This issue occurs only on the Cisco uBR10-MC5X20S and Cisco uBR10-MC5X20U cards, and when PRE-EQ (equalization-coefficient) is configured.
Workaround: Restart the cable line card.
Symptoms: A multicast quality of service (QoS) session is not automatically created when changing the group configuration or group QoS configuration (GQC).
Conditions: This issue is observed when a multicast QoS group is configured on a bundle interface and a matching static-group is defined. However, any change in the group configuration after it is applied to the bundle interface is not taken into effect, and the original multicast QoS session is removed.
Workaround: Remove the multicast QoS session from the bundle interface and re-apply it to the bundle.
Symptoms: Alignment traceback messages are displayed when the show memory leak res user and show buffer usage commands are executed.
Conditions: This issue occurs when you execute the show memory leak res user and show buffer usage commands in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
Symptoms: A memory leak is observed due to service identifier (SID) management task.
Conditions: This issue is observed when the packetcable calls are used.
Workaround: There is no workaround.
Symptoms: A memory leak is observed on the line card due to MAC parser with overnight packetcable calls.
Conditions: This issue is observed when overnight packetcable calls are used.
Workaround: There is no workaround.
Symptoms: Online Insertion and Removal (OIR) of a Personal Computer Memory Card Industry Association (PCMCIA) flash disk can cause a watchdog reset of the Performance Routing Engine (PRE).
Conditions: This issue is observed during OIR of the PCMCIA flash disk that is being actively accessed.
Workaround: Restrict the removal of PCMCIA flash disks.
Symptoms: Multiple cable modems (CMs) go offline for a short time on a random upstream port. This is seen as a spike of the error-per-second rate or a modulation error ratio (MER) drop and by a decrease in the “docsIfSigQUnerroreds” MIB object.
However, the reverse is not true—a brief degradation of the physical connectivity parameters does not necessarily trigger a brief CM loss.
Conditions: This issue is observed on the Cisco uBR10-MC5X20H line cards.
Workaround: There is no workaround.
Symptoms: Duplicate entries occur in docsBpi2CmtsMulticastObjects after the line card revertback.
Conditions: This issue is observed when a cable match command is configured with Baseline Privacy Index (BPI). The Internet Group Management Protocol (IGMP) join is received for the group in cable match command and the docsBpi2CmtsMulticastObjects is populated. This results in the line card switchover and revertback.
Workaround: There is no workaround.
Symptoms: Users with a privilege level of 15 and ‘view root’ cannot perform a secure copy (SCP).
Conditions: This issue occurs when users with ‘view root’ privilege try to perform an SCP.
Workaround: Remove the ‘view root’ privilege.
Symptoms: The Cisco uBR10000 PRE CPU utilization moves up to 100% when the field-programmable gate array (FPGA) on the Wideband SPAs plugged into a Cisco SIP-600 are being upgraded.
Conditions: This issue only occurs during the SPA Field Programmable Gate Array (FPGA) upgrade process.
Workaround: There is no workaround.
Symptoms: The CMs incapable of downstream bonding are expected to come online on downstreams that are not part of a bonding group. Non-bonding capable CMs are wrongly registered in bonded channels.
Conditions: This issue occurs when the cable service attribute non-ds-bonded downstream-type bonding-disabled command is configured on the Cisco CMTS.
Workaround: There is no workaround.
Symptoms: Active PRE fails over to the secondary reporting, with the following message:
Conditions: This issue was first observed on Cisco IOS Release 12.3(23)BC7.
Workaround: There is no workaround.
Symptoms: While configuring the cable upstream docsis-mode command using SNMP, the standby PRE module does not synchronize with this configuration.
Conditions: This issue occurs when configuring the cable upstream docsis-mode command using SNMP.
Workaround: Configure the cable upstream docsis-mode command using the CLI instead of SNMP.
Symptoms: The Cisco Wideband SPA does not transmit traffic. The Edge Quadrature Amplitude Modulation (EQAM) indicates no input traffic.
Conditions: This issue is seen on the Cisco SIP-600 with a PRE4 module, 5 x1 GigabitEthernet interface, and SPA-24XDS-SFP Wideband SPAs.
Workaround: Perform a PRE module reload.
Symptoms: Around 60 to 70 bytes of buffer memory space gets allocated when the protect line card becomes active after a system bootup.
Condition: This issue occurs during a line card switchover.
Workaround: There is no known workaround.
Symptoms: Some cable modems (CMs) may go offline during a line card switchover.
Condition: This issue occurs during a switchover of the protect Cisco uBR10-MC5X20H line card and the working Cisco uBR10-MC5X20U line card.
Workaround: Reduce the number of modems connected to the Cisco uBR10-MC5X20U line card.
Symptoms: After PRE switchover, the service flow counter shows 0 on the Cisco uBR10012 router.
Conditions: This issue occurs during a PRE switchover.
Workaround: There is no workaround.
Symptoms: Executing the term len 0 and show cable modem commands pauses the generated output randomly for up to a second on PRE4 module with hundreds of CMs.
Conditions: This issue occurs on PRE4 module with hundreds of CMs.
Workaround: There is no workaround.
Symptoms: The Cisco uBR-MC5X20U-D card crashes multiple times with the following message in the crashinfo file:
Conditions: This issue has been observed on the Cisco uBR10012 router with PRE2 module.
Workaround: There is no workaround.
Symptoms: The accumulated timing-offset of the modem goes to a negative value. The following error message is displayed at the CMTS:
Conditions: This issue occurs on the Cisco uBR10-MC5X20 line card.
Workaround: There is no workaround.
Symptoms: The Cisco uBR10-MC5X20H line card may crash after reporting memory allocation failures.
Conditions: This issue is observed when multiple memory allocations failures occur.
Workaround: There is no workaround.
Symptoms: The cable line card crashes when a specific 3-way call scenario is initiated.
Conditions: This issue occurs where multi-line ATAs are placed behind CMs in a PacketCable Multimedia (PCMM) setup.
Workaround: There is no workaround.
Symptoms: Dynamic multicast service flow and reserved bandwidth exist even after removal of multicast QoS (MQoS) configuration from the second bonding group.
Conditions: This issue occurs after a multicast QoS bandwidth reservation oversubscription occurs.
Workaround: Perform a PRE switchover.
Symptoms: The show inventory command output is not showing the secondary PRE on an uBR10012 router.
Conditions: This issue occurs on an uBR10012 router running Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
Symptoms: Inaccurate timing offset values from Cable Modem Termination Systems (CMTS).
Workaround: Apply the modem firmware patch.
Symptoms: When VPN routing and forwarding (VRF) and tunneling is configured, the output traffic rate through tunnel interface cannot exceed 4 Kbps.
Conditions: This issue occurs when the destination IP of the tunnel interface belongs to non-global VRF and the traffic direction is outgoing.
Workaround: Make sure that the destination IP address of the tunnel interface belongs to global VRF, and not to specific VRF.
Symptoms: Cisco Wideband SPA sends only “sync Tx” packets.
Conditions: This issue is observed after Cisco Wideband SPA reload and when a DOCSIS Timing Interface (DTI) server is used.
Workaround: Reload the jacket card.
Symptoms: Generic Routing Encapsulation (GRE) tunnel does not forward traffic.
Conditions: This issue occurs when a new GRE tunnel is created on a Cisco uBR10012 router.
Workaround: Execute the shutdown and the no shutdown commands on the tunnel interface.
Symptoms: The IGMPv3 CPE behind the DOCSIS 3.0 main distribution frame (MDF) capable modem using local integrated-cable downstream interface as primary, fails to receive any multicast traffic after the Cisco UBR-MC20X20V line card switchover occurs due to Downstream Service Identifier (DSID) change.
Conditions: This issue occurs when the Cisco UBR-MC20X20V line card fails to receive traffic after a switchover.
Workaround: There is no workaround.
Symptoms: The debug output to the terminal is halted when “logging discriminator” is enabled.
Conditions: This issue was observed in Cisco IOS Release 12.2(33)SCB5.
Workaround: There is no workaround.
Symptoms: Flow-control does not function on the ESR-HH-1GE interface of a Cisco uBR10012 router.
Conditions: This issue occurs on the ESR-HH-1GE interface of a Cisco uBR10012 router.
Workaround: There is no workaround.
Symptoms: It is not possible to configure the 5X1 Gigabit Ethernet port after swapping SPAs.
Conditions: This condition occurs after replacing a 24rfchannel-spa-1 card with a SPA-5X1GE-V2 card.
Workaround: Reload the router or perform an OIR on the 24rfchannel-spa-1 card with another 24rfchannel-spa-1 card.
Symptoms: The Wideband DOCSIS 3.0 modem does not receive MAC Domain Descriptor (MDD) from Cisco uBR10012 router, and retraces to narrowband.
Conditions: This issue occurs on a Cisco uBR10-MC5X20H line card.
Workaround: Remove the downstream modular-cable configuration from the cable interface and then reinstall the line card. Another workaround is to reload the line card.
Symptoms: A crash may occur on the Cisco uBR10-MC5X20H line card due to Internet Protocol Communications (IPC) timeout.
Conditions: This issue occurs as the PRE module crashes due to an IPC time out.
Workaround: There is no workaround.
Symptoms: A message is required indicating duplicate frequencies are configured on the integrated-cable controllers.
Conditions: This message is required during migration of the Cisco uBR10-MC5X20H line card to the Cisco UBR-MC20X20V line card.
Workaround: The downstream RF-channel assignment needs to be mapped prior to migration.
Symptoms: The secondary port does not become active.
Condition: This issue occurs on a Cisco uBR10012 router with Downstream External PHY Interface (DEPI) control plane configured.
Workaround: There is no workaround.
Symptoms: Static group and session is not created when static multicast group and source address exists in cable modem configuration file.
Conditions: This issue occurs when you specify the static multicast group and source address in cable modem configuration file.
Workaround: There is no workaround.
Symptoms: Excessive unicast and multicast packet loss is seen on a Wideband SPA switchover.
Conditions: This issue occurs on a Wideband SPA GigabitEthernet interface. The switchover takes 70 seconds to converge.
Workaround: There is no workaround.
Symptoms: The router displays high CPU utilization for 1 to 2 minutes after issuing privilege interface commands. As a result, the router takes a long time to reload, after saving the configuration changes.
Conditions: This issue has been observed while using privilege interface commands on uBR10012 router running Cisco IOS Release 12.2(33)SCB5.
Workaround: Avoid using privilege interface commands.
Symptoms: The DOCSIS 3.0 cable modem goes offline after giving the test cable dcc command with a ranging technique of 1.
Conditions: This issue occurs when the test cable dcc command is issued with a ranging technique of 1.
Workaround: There is no workaround.
Symptoms: The Wideband SPA does not perform Address Resolution Protocol (ARP) after the failure of the active port.
Conditions: This issue occurs under normal operating conditions.
Workaround: There is no workaround.
Symptoms: The cable modems go offline on a port.
Conditions: This issue is observed on the downstream PHY on the cable line cards
Workaround: Reload the line cards.
Symptoms: The upstream-service-group is removed from MAC-domain after the line card and PRE switchover.
Conditions: This issue is observed following the Cisco UBR-MC20X20V line card and PRE switchover on Cisco IOS Release 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: PRC_CONFIG_CHANGE is returned instead of the PRC_CONFIG_NO_CHANGE.
Conditions: This issue occurs when cable admission-control ds-bandwidth and cable admission-control us-bandwidth commands are executed for the second time in global or interface configuration mode.
Workaround: There is no workaround.
Symptoms: Minor alarm on the uBR10012 router when the cable line card is administratively down.
Conditions: This issue has been observed on the uBR10012 router with Cisco IOS Releases 12.3(23)BC08 and 12.2(33)SCB5.
Workaround: Reload the router.
Symptoms: PRE4 shows high-rate of IPC errors consistently.
Conditions: This issue is observed on the uBR10012 router with Cisco IOS Release 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: All cable modems under a single upstream unexpectedly move to expire(pt) state.
Conditions: This issue occurs on a uBR10012 router running Cisco IOS Release 12.2(33)SCB3. The other upstreams on the same line card are not affected.
Workaround: The modems do not recover automatically. Run shut/no shut on the upstream to restore CMs.
Symptoms: The route processor crashes when polling for cefFESelectionEntry.
Conditions: This issue occurs after performing the following steps:
1. From the global configuration mode, remove the bundle using no interface bundle x command.
2. Configure the cable interface using interface cable x/y/z command.
3. From the cable interface configuration mode, add the bundle back using cable bundle x command.
4. Configure the IP address and other parameters for the bundle interface.
5. Run a query for the cefFESelectionEntry.
The router crashes following the query.
Workaround: Configure a new bundle with a different bundle index. Do not reuse a removed bundle.
Symptoms: Multicast data traffic is not forwarded to VRF group.
Conditions: This issue occurs when Multicast Virtual Private Network (MVPN) is set up.
Workaround: There is no workaround.
Symptoms: The Cisco uBR-MC8X8V cable interface line card may crash.
Conditions: This issue occurs while trying to access an active multicast session key using show interface key sid command with multicast sids on a Cisco uBR7200 series router.
Workaround: Do not use multicast sids.
Symptoms: System Event Archive (SEA) console feature is enabled on the PRE4.
Conditions: This issue occurs when the SEA feature is present in the IOS image.
Workaround: Delete the sea_console.dat file present on the PRE4 bootflash.
Symptoms: The “ARP-3-STCKYARPOVR: Attempt to overwrite Sticky ARP entry” message is logged as a higher severity level error.
Conditions: This issue is observed while the router tries to overwrite the sticky ARP entry.
Workaround: There is no workaround.
Symptoms: A bus error occurs on the uBR10012 router running Cisco IOS Release 12.2(33)SCC.
Conditions: This issue occurs when the SNMP getNext query is in progress for the docsIf3CmtsCmRegStatusEntry MIB object.
Workaround: There is no workaround.
Symptoms: Tracebacks occur after the Hot Standby Connection-to-Connection Protocol (HCCP) failover and revertback of the line card.
Conditions: This issue occurs after a line card reset, and an HCCP failover and revertback of the line card.
Workaround: There is no workaround.
Symptoms: The output of the show interface service flow counter command displays a wrong result.
Conditions: This issue is observed on the following conditions:
1. Configure two group configurations (GCs) with same session-range, but with different type of service (ToS) and group QoS configuration (GQC) (Use aggregate for one and single for the other).
2. Send two multicast traffic with session-range in both GCs. Do not use ToS in either of them, so that all traffic goes through the default service flow.
Workaround: This is a display issue and the actual traffic goes through the right service flow.
Symptoms: The CMTS crashes due to a bus error.
Conditions: This issue occurs only when the PRE is out of memory.
Workaround: There is no workaround.
Symptoms: The modulation profile preamble length for internal usage code (IUC) types, station, and initial becomes very large.
Conditions: This issue is observed on the uBR10012 routers with uBR10-MC5X20H-D and UBR-MC20X20V-D line cards on Cisco IOS Release versions 12.2(33)SCC and 12.3(23)BC.
Workaround: Use a different modulation profile.
Symptoms: Memory leak and traceback occurs when large number of modems are reset from the Cisco uBR10-MC5X20H line cards.
Conditions: This issue has been observed after resetting large number of modems those are provisioned with Baseline Privacy Interface Plus (BPI+) enabled DOCSIS configuration.
Workaround: Provision the cable modems with non-BPI configuration file.
Symptoms: The “service unsupported-transceiver” configuration on a PRE4 is not available.
Conditions: This issue is observed only on PRE running the Cisco IOS Releases 12.2(33)SCB5, 12.2(33)SCC, and 12.2(33)SCD.
Workaround: There is no workaround.
Symptoms: All cable modems on adjacent downstreams (0 and 1, or 2 and 3, or 4) are offline.
Conditions: The downstream ports that share JIB may be nonfunctional if the JIB that services both downstream ports are locked.
A device running Cisco IOS Software, Cisco IOS XE Software, or Cisco IOS XR Software is vulnerable to a remote denial of service condition if it is configured for Multiprotocol Label Switching (MPLS) and has support for Label Distribution Protocol (LDP).
A crafted LDP UDP packet can cause an affected device running Cisco IOS Software or Cisco IOS XE Software to reload. On devices running affected versions of Cisco IOS XR Software, such packets can cause the device to restart the mpls_ldp process.
A system is vulnerable if configured with either LDP or Tag Distribution Protocol (TDP).
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
http://www.cisco.com/warp/public/707/cisco-sa-20100324-ldp.shtml
Symptoms: The router crashes while trying to delete files from corrupt Analog Telephone Adaptor (ATA) disk.
Conditions: This issue occurs when the ATA disk is corrupted. The ATA disk displays “Cluster chain broken on file” message during access.
Workaround: There is no workaround.
Symptoms: Cable modem drops offline during an In-Service Software Upgrade (ISSU) procedure for line card upgrade.
Conditions: This issue occurs after you perform the following steps:
1. Load image on both the Performance Routing Engines (PREs).
2. Start packet call after making sure that all the modems are online.
3. Wait until next round of packet call (ensure that sid value is changed for dynamic UGS service flows).
5. Wait until both the PREs are ready.
6. Perform a line card switchover.
7. Perform a line card revertback.
Workaround: There is no workaround.
Symptoms: OIR upgrade from uBR10-MC5X20S/U/H line card to UBR-MC20X20V line card fails when Data-over-Cable Service Interface Specifications (DOCSIS) mode is Annex A and the spectrum range is 5-65 Mhz. All the cable interfaces are placed in ‘administratively down’ state and the following error messages may be seen:
Conditions: This issue occurs when Annex A is configured on the downstream and spectrum range of 5-65 Mhz is configured on the upstream of a uBR10-MC5X20S/U/H line card.
Workaround: Complete the following steps:
1. Reduce the frequency range of uBR10-MC5X20S/U/H line card to 5-55 Mhz range before the upgrade.
2. Perform a switchover to the protect card (should be UBR-MC20X20V line card).
3. Upgrade the working uBR10-MC5X20S/U/H line card to UBR-MC20X20V line card.
4. Revertback to the working card which was upgraded.
5. Change the frequency range back to 5-65 Mhz range.
NoteChanging the spectrum group frequency or the fixed frequency is a destructive operation and it may reassign the frequencies on the upstream. Some modems can fall offline on all cards using that spectrum group. We recommend Online Insertion and Removal (OIR) upgrades only in a maintenance window.