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Cisco Bug: CSCub19921 - ISIS routes flapped on the nei router during IETF NSF

Last Modified

Feb 11, 2018

Products (17)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco ASR 901-4C-F-D Router
  • Cisco ME 3600X-24FS-M Switch
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
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Known Affected Releases


Description (partial)

Symptoms: Route flaps could occur after a switchover when a router is configure
to use ISIS IETF NSF. The route timestamp is refreshed in the <CmdBold>show ip
route<noCmdBold> command output. Packet traffic going through the router could
be dropped as a result of the switchover. This issue is seen only with a
point-to-point interface or on a LAN configured as point-to-point.

Conditions: This symptom occurs when you configure ISIS NSF IETF and the
point-to-point interface.
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Bug Details Include

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