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VSPs are stuck with stale default route learned over ISIS even after dropping the ISIS adj

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TitleVSPs are stuck with stale default route learned over ISIS even after dropping the ISIS adj
Symptoms
  • Default routes stuck in forwarding table pointing to a next hop across NNI even though ISIS adjacency to that next hop is down.
Environment
  • All VOSS and VSP platforms
  • All software
Cause
  • There was another path available to get to that next hop via a third switch, which has active ISIS adjacencies to both end points.
Resolution
The switch working as designed.
Additional notes

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