BGP process may deactivate the peering session without waiting for the hold-down time to expire. This feature is enabled by default for eBGP sessions using the BGP process
command bgp fast-external-fallover
Configured on a per-neighbor basis using the command neighbor fall-over. This feature applies to both iBGP and eBGP and does not depend on interface state. The IGP route used to reach the peer configured for fast session deactivation is monitored by the BGP process. When the IGP route disappears, the BGP session gets immediately torn down unless there is a backup IGP route to reach the peer.
R5(config-router)#bgp fast-external-fallover
R5(config-router)#neighbor 15.1.1.1 fall-over
command bgp fast-external-fallover
Configured on a per-neighbor basis using the command neighbor
R5(config-router)#bgp fast-external-fallover
R5(config-router)#neighbor 15.1.1.1 fall-over
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