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Cisco Bug: CSCvv86764 - BGP doesn't separate 'received & used' path to 'received-only' and 'used' paths on Gshut activation

Last Modified

Oct 07, 2020

Products (1)

  • Cisco Network Convergence System 5500 Series

Known Affected Releases

6.6.3.BASE

Description (partial)

Symptom:
Topology:
~~~~~~~~
(Spirent)R2 -----(ebgp)------ (SE1)R1 ------(ebgp)------(SE2)R3

BGP does not separate 'received & used' path to 'received-only' and 'used' paths when graceful-maintenance is activated for a neighbor. It also doesn't collapse  'received-only' and 'used' paths to 'received & used' path when graceful-maintenance is deactivated.

'graceful-shut' path flag is set on the 'received & used' path when graceful-maintenance is activated on R1 towards R2 in presence of  'soft reconfiguration inbound' on R1 towards R2. 

Has no functional impact. But takes up more memory if 'received-only' and 'used' paths are not collapsed into 'received & used' path on gshut deactivation

Conditions:
BGP neighbor flap or process restart when "Graceful-Maintenance activate" and "soft-reconfiguration inbound" is configured for the neighbor.
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