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Cisco Bug: CSCvs38613 - isis crashes while processing App Specific SRLG (TLV 238) change

Last Modified

Jun 18, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9906 Router
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Known Affected Releases


Description (partial)

ISIS process unexpectedly restarts itself

Problem can be seen in an unstable network, when source routers originate LSPs with App Specific SRLG (TLV 238), and the LSP is quickly and repeatedly updated in very short interval.

The crash may happen upon processing second LSP changes before running SPF, or upon running TI-LFA SPF while the LSP has already changed. Not every such event sequence leads to the crash though, very specific internal memory processing state needs to be met in order to experience the problem.
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