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

Last Modified

Feb 15, 2019

Products (28)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco 7206 Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco 7301 Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco 7204 Router
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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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