This behavior is enabled by default . BGP process registers the NEXT_HOP attribute values with the RIB table watch process. As soon as any change that affects an existing NEXT_HOP occurs, the watch process notifies the BGP router process. If the change results in prefix withdrawn, the BGP process immediately removes the prefix.
The BGP "Rib watcher process" registers all of the next hops reported and will "call back" to BGP whenever there is
- next hop unreachable
- next hop metric change
The 1st one is more important and is reported faster. IGP reports are delayed by default for 5 seconds.
R1(config-router)#bgp nexthop trigger delay 10
The BGP "Rib watcher process" registers all of the next hops reported and will "call back" to BGP whenever there is
- next hop unreachable
- next hop metric change
The 1st one is more important and is reported faster. IGP reports are delayed by default for 5 seconds.
R1(config-router)#bgp nexthop trigger delay 10
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