Save your network...Reliability low bug on NPE-G2

Yerterday, a cisco bug is hitting mainly service provider network. Symptoms of the bug: All frames received on gigabit ethernet interface are dropped. All drops are reported as overruns in the output of show interfaces and show controllers. This is mainly hitting Cisco 7206 NPE-G2 router.
So if the problem is being faced first checked the bug CSCsk65796.

Bug was found in 12.2SB, 12.4T and 12.4XD.

NPE-G2: all rx frames counted as overruns on built-in gige
Symptoms: All frames received on gigabit ethernet interface are dropped. All drops are reported as
overruns in the output of show interfaces and show
controllers.

Conditions: Symptom is observed on gigabit ethernet interfaces on NPE-G2 network processor of Cisco 7200 Series Routers. All IOS trains that support NPE-G2 are affected.

Workaround: There is no workaround. When the gigabit controller falls into this condition, the only way to recover is to power-cycle the router. Soft reload does not clear the problem.

Further Problem Description:

Ethernet controller goes into promiscuous mode under two conditions:
- bridging is configured on the interface
- number of MAC addresses that have to be stored in its MAC address filter
table exceed the capacity of the table.

The latter case may happen when a large number of HSRP groups is configured or a
large number of IP multicast groups are to be received on the interface.


regards
shivlu jain

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