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Cisco Bug: CSCvt85322 - Wrong label stack in TI-LFA backup path when node SID distributed by two ISIS instances

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.1.1.BASE

Description (partial)

Symptom:
In specific network design, where node SID prefix is advertised by multiple ISIS instances, with mutual redistribution at multiple nodes in the network, the TI-LFA backup may have an incorrect implicit null label for the affected prefix SID.

Conditions:
The problem happens when the last P node in the TI-LFA backup label stack is also redistributing the affected prefix from another IGP instance.
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