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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


Description (partial)

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.

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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