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Cisco Bug: CSCvu18265 - Building Node Cache can consume high CPU when Segment Routing is not enabled

Last Modified

Sep 02, 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 ASR 1002-HX Router
  • Cisco ISR 1000 Series IOS XE SD-WAN
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Known Affected Releases

16.9.4 17.3.1

Description (partial)

High CPU usage by IS-IS Update process for several seconds.

Segment Routing is NOT enabled on the Local router.
Segment Routing is enabled on another router in the network - but SIDs have not yet been assigned for the node address(es) of that router.

 That router is advertising a large number of prefixes e.g., leaking prefixes from another level.
Reachabiliity to some of the prefixes is flapping with some frequency.
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Bug Details Include

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