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Cisco Bug: CSCur79699 - Route marked as "no best path" after "bgp sourced-paths" config

Last Modified

Aug 15, 2017

Products (16)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
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Known Affected Releases

15.5(2)S

Description (partial)

Symptom:
This is an extremely rare configuration and is there in IOS possibly day-1. The best path of the network in the BGP VPN VRF table is deleted and none the remaining paths are made bestpath leaving the net without any bestpath.

Conditions:
When a net in VRF C gets 2 paths imported from VRF A and VRF B. These paths point to the same locally sourced next-hop. Then some operations inside the VRFs A or B may result in the best path of the net in C to disappear. Subsequently that net no longer get bestpath computed. Unless the source of this route is reset.
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Bug Details Include

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