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Cisco Bug: CSCvs68255 - Traceback seen when IS-IS crosses LSP boundary and tries to add information in new LSP

Last Modified

Aug 20, 2020

Products (14)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ISR 4000 Series IOS XE SD-WAN
  • Cisco ASR 1002-HX Router
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Known Affected Releases


Description (partial)

When Segment Routing is enabled, some prefix reachability advertisements may not be advertised in LSP #0 as expected. An error log similar to what is below will appear:

*Jan 14 22:55:35.231: %CLNS-3-LSPGENERROR: LSPGEN cache usage is inconsistent with actual LSP space usage. 
     Cannot add admin tag and/or prefix-sid subtlv

Segment Routing is enabled
A large number of prefixes are being advertised - either because of redistributiion of prefixes from another protocol or because of leaking of prefixes from Level-1 to Level-2. The number of prefixes advertised must be enough to require multiple LSPs to be generated.
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