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Cisco Bug: CSCvs45712 - Remote (SR) microloop avoidance canceled when TE attribute changes

Last Modified

Sep 02, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9912 Router
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Known Affected Releases


Description (partial)

Remote (segment-routing) microloop avoidance may not get triggered, or may get canceled, when a TE attribute on a link changes, but metric stays the same.

The problem happen under following conditions:

1/ When SR microloop avoidance is active, an TE attribute change on any link will cancel it


2/ Valid SR microloop avoidance trigger happens (link up, down, metric change, OL bit set/clear),
but in addition to that, a TE attribute changes on a different link simultaneously.
In such case, SR microloop avoidance calculation won't start because of too many changes.
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Bug Details Include

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