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Cisco Bug: CSCvv24156 - FlexAlgo: ISIS crash when ISIS adjacency goes down

Last Modified

Oct 06, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

17.4.1 17.5.1

Description (partial)

Symptom:
Cisco router running IOS XE may crash, if ISIS adjacency goes DOWN for any reason.

Conditions:
Router is configured with Flex-Algo segment-routing. On the interface it's present flex-algo configuration like shown on the example.

interface Ethernet0/2
...
 ip router isis 1
 isis network point-to-point 
 isis affinity flex-algo
  name RED
  name GREEN
  !
end

router isis 1
...
 affinity-map GREEN bit-position 250
 affinity-map RED bit-position 4

router isis 1
...
 affinity-map GREEN bit-position 250
 affinity-map RED bit-position 4

Note, it's used bit-position larger than 7.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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