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Cisco Bug: CSCvs56721 - spoke-to-spoke PLR packets should not change the interface PLR status

Last Modified

Jan 22, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

16.9.1

Description (partial)

Symptom:
Channels originated from Spoke on the SP that PLR is not enabled not may be stuck in 0-SLA OFF and PLR ON state. When hitting into this issue, those channels(for any dscp) will not be available for TC control. The show output of "show domain XX [vrf YY] master status" will indicate both 0-SLA and PLR are not enabled, but by checking the corresponding interface in "show platform hardware qfp active feature pfrv3 client interface", you will find 0-SLA disabled but PLR enabled. Also you may find the both counters of 'interface color change' and 'drop throttled punt' in the output of 'show platform hardware qfp active feature pfrv3 datapath globals' keep increasing.

Conditions:
This should be a very corner case, both of the following 3 conditions need be met:
- Disable PLR(path-of-last-resort);
- There should be spoke to spoke traffic;
- Very rarely happened timing issue during the state transition of PLR on Spoke sites
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