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

Last Modified

Aug 29, 2020

Products (16)

  • Cisco ASR 1000 Series Aggregation Services Routers
  • Cisco 4221 Integrated Services Router
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco ASR 1002-X Router
  • Cisco 4331 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ASR 1000 Series Route Processor (RP2)
  • Cisco ASR 1002-HX Router
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Known Affected Releases

16.8.1 16.9.1 16.9.3

Description (partial)

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.

This should be a very corner case, both of the following 3 conditions need be met:
- Disable PLR(path-of-last-resort) or box reload if no PLR configured;
- 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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