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Cisco Bug: CSCuo20651 - IPv6 Traffic puntted unexpectedly in 6PE over CSC case

Last Modified

Jul 03, 2019

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases


Description (partial)

When a IPv6 prefix1 is reachable over IPv6 prefix2
and also Ipv6 prefix2 is reachable via a MPLS Label 
such as in a 6PE or 6VPE topology.
The re-programming of IPv6 prefix1 becomes stale (meaning first_rldi bit is 
not set to 0 or 1 correctly) when MPLS Label changes from recursive to 
non-recursive (meaning it transitions to a BGP learnt or a IGP learnt  label).

- ASR9000 routers should be running release 4.3.4 or 5.1.1
- 6VPE or 6PE learnt routes reachable via MPLS label nexthop which has changed from recursive to non-recursive or non-recursive (IGP) learned to recursive (BGP learned)
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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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