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Cisco Bug: CSCus53498 - lc_port_channel crashed, when storage vdc reloaded on 383 S1

Last Modified

Jan 28, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.2(0)D1(0.383)

Description (partial)

Symptom:
Storage VDC reload after doing a "write erase" of the start-up configuration can cause crash in PCM client on line card.

Conditions:
Clearing of the start-up config and a subsequent reload of the storage VDC causes the port channels in the VDC to be removed. While the port channels are being removed , it may cause a failure to delete the port-channel from the PSS. This is because the Ethernet Port Channel type in N7k wasn't properly handled in the Line card. The following Debug log indicates this failure:

lc_port_channel_pss_delete_data:  unknown type being stored into pss 22 for ifindex  <port channel ifindex>

Port channel ifindex can be read from the show port-channel internal info interface port-channel <number> , command.

When this failure occurs its likely that some stale members and port-channel will be left behind in the Line card memory with the same ifindex. When subsequently, the configuration is restored for the storage VDC for the same port-channel and member, it finds the stale port-channel member pointing to an existing port as indicated in the error logs in symptoms. It then tries to delete this stale member from the stale port channel causing the crash.
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