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Cisco Bug: CSCvu92676 - TI-LFA OR uloop not becoming operational in certain platform when we programme SRTE auto tunnel path

Last Modified

Oct 01, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.3.1.BASE

Description (partial)

Symptom:
Forwarding is broken when OSPF programmed a path via SRTE auto paths for TI-LFA protection or Microloop Avoidance on certain platform (e.g. NCS55xx, NCS5xx, 8xxx, etc.) that do not support them.

This results in TI-LFA and Microloop Avoidance not to work and may cause other issues in the platform forwarding layer.

Conditions:
Issue is specific to platforms like NCS5xxx, NCS5xx and 8xxx when OSPF is enabled with Segment Routing and TI-LFA or Microloop Avoidance features are enabled.
For this scenario to occur, the number of labels required for the TI-LFA/Microloop Avoidance path need to be greater than supported for label stack usage directly that requires use of SRTE auto paths instead.
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Bug Details Include

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