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Cisco Bug: CSCvt69577 - LSP updates prematurely generated when large number of propagated prefixes disappear

Last Modified

Sep 02, 2020

Products (1)

  • Cisco Network Convergence System 5500 Series

Known Affected Releases

7.0.90.BASE

Description (partial)

Symptom:
When an L1L2 ISIS router is propagating large number of prefixes between levels, and the reachability to the sourcing level is lost, the local LSPs in the destination level might be updated multiple times, as the prefixes are being removed in the sourcing level.

That may result in delayed convergence in the destination level.

Conditions:
High number of prefixes (thousands) being propagated L1->L2 or leaked L2->L1

Short LSP update timer can make the problem worse, by increasing the chance to send LSP update prematurely and therefore delay the convergence even further.
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