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Cisco Bug: CSCvv01496 - Fast-reroute backup paths are not updated in the RIB when ISIS admin distance decreased

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.3.1.BASE

Description (partial)

Symptom:
With multiple protocol instances, fast-reroute backup paths are not updated in the RIB when the ISIS admin distance is decreased.

steps to reproduce
==============
1) configure 2 isis instances (isis 1 , isis 3)
2) for an unlabel prefix say p1 , configure 1st instance to allocate label and having TILFA and 2nd instance to deny label
3) configure isis distance such that RIB prefers "isis 2"
4) change admin distance of isis 1 such that isis 1 is preferred by RIB
5) observe RIB is not updated with TILFA backup

Conditions:
ISIS configured for fast-reroute and changing the isis administrative distance configuration.
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