[c-nsp] BGP routes co-existing with different local-preference

[Rubens Kuhl Jr.]

> Upon further investigation, it seems that the BGP session with the
> router that went down took it's time to time out, which meant the
> former best routes stayed for some time.

Upgrading to 12.0(29)S or later would give you "BGP Fast Peering
Session Deactivation":

"The BGP Support for Fast Peering Session Deactivation feature
introduces an event driven notification system that allows a Border
Gateway Protocol (BGP) process to monitor BGP peering sessions on a
per-neighbor basis. This feature improves the response time of BGP to
adjacency changes by allowing BGP to detect an adjacency change and
deactivate the terminated session in between standard BGP scanning
intervals. Enabling this feature improves overall BGP convergence."



Rubens