Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 272

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718
Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
Symptoms: Continuous %IPC-5-WATERMARK: 884 messages pending in xmt for the port slot on
a Cisco 7600 SIP-400. It affects any type of Cisco 7600 chassis and is not specific to any supervisor.
The messages are warnings that the buffer is being used up.
Conditions: The problem occurs under high traffic conditions between RP and line card. The
underlying Ethernet Out of Band Channel (EOBC) transport encounters lots of collisions, which
results in the WATERMARK message.
Workaround: There is no workaround.
CSCsl49628
Symptoms: When a VPN routing/forwarding (VRF) is deleted through the CLI, the VRF deletion
never completes on the standby RP, and the VRF cannot be reconfigured at a later time.
Conditions: This symptom is observed when BGP is enabled on the router.
Workaround: There is no workaround.
CSCsl49705
Symptoms: ISSU between SRB-2 & SRB-3 done, with tunnels configured on active, causes
"IDBINDEX_SYNC-4-RESERVE" messages on standby (SRB-2) & a delay (wait) of around 3 sec
per tunnel. This causes a standby reset in cases where there are large number of tunnels configured.
Conditions: Occurs when tunnels are configured.
Workaround: Remove tunnel configurations before doing ISSU.
CSCsl50271
Symptoms: An Open Shortest Path First (OSPF) enhancement, to avoid a suspend when link state
update packets are sent, may result in a router crash.
Conditions: The symptoms are observed in a scenario with 3k tunnels. Both unconfiguring the
loopback interface and deleting the loopback interface trigger the same code path that may lead to
OSPF suspension.
Workaround: There is no workaround
Further Problem Description: The problem actually exists in all branches. However, this is a timing
issue.
CSCsl50471
Symptoms: Egress traffic stops on AToM Cell Relay shaped VC configured on an OC3 SPA interface
when the received load from the MPLS network exceeds the egress shaped rate.
Conditions: An AToM Cell Relay shaped VC is configured on an OC3 SPA interface in a SIP-400.
The received load from the MPLS network exceeds the egress shaped rate.
Workaround: Configure an ingress MQC service policy to police the ingress traffic rate.
CSCsl50500
Symptoms: System reset due to WATCHDOG ERROR.
Conditions: Occurred during heavy stress condition CPU freeze observed. Specific to RSP720
hardware. Occurred only once and considered to be rare.
Workaround: There are no workarounds that would guarantee that the problem will not occur. The
probability of the occurrence can, however, be lowered by protecting the RP CPU from overload.
This can be achieved by enabling MLS rate-limiters or configuring Control Plane Policing.
CSCsl50569
Symptoms: A SIP-400 module may drop all ingress packets destined for another fabric-enabled
module. Prior to this, the module would be operating correctly.
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