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Cisco Bug: CSCun68542 - invalid prefixes learned from RR with bgp add-path feature enabled

Last Modified

Nov 27, 2020

Products (2)

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

Known Affected Releases

15.2(4)S 15.4(1)S

Description (partial)

Symptom: CSR1000V router running XE3.11 (15.4(1)S) working as Route Reflector. 

The route-reflector is advertising prefixes with incorrect subnet masks to ibgp peers and route-reflector clients.  The incorrect prefixes are not present in the bgp table of the route-reflector itself, however they do get installed in the bgp table of the router receiving the update.
Conditions: This symptom is observed when BGP route reflector uses the additional paths feature.
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