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Cisco Bug: CSCur78381 - After a reboot of SPA-4XCT3/DS0, first 4 packet loss in channelized mode

Last Modified

Feb 13, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.4(3)S

Description (partial)

Symptom:
This problem has two parts:

1. Either after a reboot of chassis or reset(soft-OIR) of the module/SPA, 
Individual DS1s de-multiplexed out SPA-4XCT3/DS0 will stop passing traffic for 
5-6 seconds immediately after the DS1 line protocol comes up.

2. After the condition #1, traffic passes for a while(~half a minute), and then 
traffic freezes again for 4-5 seconds on DS1 Serial interfaces and then module 
operation normalizes and continue to work fine.

During the above problematic window, control-plane & PUNT traffic seems to be 
working fine, as we could see that:

1. Layer-2 connectivity established and we did not observe any missed keepalives.
2. EIGRP adjacency comes up immediately as soon as the line protocol comes up.

Conditions:
When SPA-4XCT3/DS0 is configured in channelized mode for de-multiplexing
DS3 into multiple DS1s.
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