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Cisco Bug: CSCul99015 - Additional peer destination seen on standby RP

Last Modified

Feb 13, 2018

Products (21)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.4(1.16)S0.5 15.4(2)S

Description (partial)

Symptom: In VPLS using BGP signaling with Inter AS, when a PE on another AS is reachable through multiple ASBRs, the PW destination and the next hop PE address of some or all of the PWs in the standby RP remains as the non-preferred ASBR address instead of the preferred ASBR address.
Conditions: This symptom occurs under the following conditions:
1. BGP L2VPN NLRIs received first from an ASBR becomes a less preferred ASBR on receiving NLRIs for the same VE-IDs from a more preferred ASBR. 
2. NLRI received from the more preferred ASBR has the same values (VEID, VBO, VBS, Label Base, MTU and CW) as the ones received previously from the other ASBR.
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