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Cisco Bug: CSCta83577 - u6rib infinite loop on client dereg with route loops

Last Modified

Feb 01, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases


Description (partial)


A Nexus 7000 may syslog various %SYSMGR-2-SERVICE_CRASHED messages
then perform a stateful switchover if a standby supervisor is


This can happen under the rare condition that a routing loop was
detected by the IPv6 RIB, and while this "(hidden)" route remained
installed in the RIB, an IPv6 Routing client was deconfigured.


<CmdBold>no router rip cisco<NoCmdBold>

Note: an IPv6 routing loop is announced via the
%U6RIB-3-RNH_LOOP_ERROR message.
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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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