BGP version 4Minimum time between advertisement runs is 5 secondsFor address family: IPv4 UnicastBGP neighbor is zanzibar, peer-group internal,Number of peers in this group 26Peer-group members (* - outbound optimized):10.68.160.110.68.161.110.68.162.110.68.163.110.68.164.110.68.165.110.68.166.110.68.167.110.68.168.110.68.169.110.68.170.110.68.171.110.68.172.110.68.173.110.68.174.110.68.175.110.68.176.110.68.177.110.68.178.110.68.179.110.68.180.110.68.181.110.68.182.110.68.183.110.68.184.110.68.185.1Dell>Configuring BGP Fast Fall-OverBy default, a BGP session is governed by the hold time.BGP routers typically carry large routing tables, so frequent session resets are not desirable. The BGP fast fall-over feature reduces theconvergence time while maintaining stability. The connection to a BGP peer is immediately reset if a link to a directly connected externalpeer fails.When you enable fall-over, BGP tracks IP reachability to the peer remote address and the peer local address. Whenever either addressbecomes unreachable (for example, no active route exists in the routing table for peer IPv6 destinations/local address), BGP brings downthe session with the peer.The BGP fast fall-over feature is configured on a per-neighbor or peer-group basis and is disabled by default.To enable the BGP fast fall-over feature, use the following command.To disable fast fall-over, use the [no] neighbor [neighbor | peer-group] fall-over command in CONFIGURATIONROUTER BGP mode.• Enable BGP Fast fall-Over.CONFIG-ROUTER-BGP modeneighbor {ip-address | peer-group-name} fall-overExamples of Verifying that Fast fall-Over is Enabled on a BGP Neighbor and a Peer-GroupTo verify that you enabled fast fall-over on a particular BGP neighbor, use the show ip bgp neighbors command. Because fast fall-over is disabled by default, it appears only if it has been enabled (shown in bold).Dell#sh ip bgp neighborsBorder Gateway Protocol IPv4 (BGPv4) 199
