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Cisco Bug: CSCuq49217 - Stale BGP leaked routes in destination VRF with soft-reconfig in config

Last Modified

Nov 27, 2020

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.1(3)S2 15.2(3)S

Description (partial)

A prefix that has been imported into a vrf is not removed when the original source prefix is withdrawn.

Soft-reconfiguration inbound is configured towards the peer that is advertising the prefix.
The following sequence of events needs to occur 1) Prefix is learned and properly imported into destination vrf.  2) Some event causes the source prefix to become dropped.  This means that in the source vrf, the prefix only has paths marked as "received-only".

An example of how (2) can occur is that there is an inbound route-map for which the original prefix matches, but then some event on the peer router causes the prefix to be readvertised with attributes that no longer match the inbound route-map.  The router still keeps a copy of the prefix because soft-reconfiguration inbound is configured.
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