BGP version 4
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP neighbor is zanzibar, peer-group internal,
Number of peers in this group 26
Peer-group members (* - outbound optimized):
10.68.160.1
10.68.161.1
10.68.162.1
10.68.163.1
10.68.164.1
10.68.165.1
10.68.166.1
10.68.167.1
10.68.168.1
10.68.169.1
10.68.170.1
10.68.171.1
10.68.172.1
10.68.173.1
10.68.174.1
10.68.175.1
10.68.176.1
10.68.177.1
10.68.178.1
10.68.179.1
10.68.180.1
10.68.181.1
10.68.182.1
10.68.183.1
10.68.184.1
10.68.185.1
Dell>
Conguring BGP Fast Fall-Over
By 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 the
convergence time while maintaining stability. The connection to a BGP peer is immediately reset if a link to a directly connected external
peer fails.
When you enable fall-over, BGP tracks IP reachability to the peer remote address and the peer local address. Whenever either address
becomes unreachable (for example, no active route exists in the routing table for peer IPv6 destinations/local address), BGP brings down
the session with the peer.
The BGP fast fall-over feature is congured 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 CONFIGURATION
ROUTER BGP mode.
• Enable BGP Fast fall-Over.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} fall-over
Examples of Verifying that Fast fall-Over is Enabled on a BGP Neighbor and a Peer-Group
To 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 neighbors
190
Border Gateway Protocol IPv4 (BGPv4)
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