Administrator Guide

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 | ipv6-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).
DellEMC#sh ip bgp neighbors
BGP neighbor is 100.100.100.100, remote AS 65517, internal link
Member of peer-group test for session parameters
BGP version 4, remote router ID 30.30.30.5
BGP state ESTABLISHED, in this state for 00:19:15
Last read 00:00:15, last write 00:00:06
Hold time is 180, keepalive interval is 60 seconds
Received 52 messages, 0 notifications, 0 in queue
Sent 45 messages, 5 notifications, 0 in queue
Received 6 updates, Sent 0 updates
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 5 seconds
Minimum time before advertisements start is 0 seconds
Capabilities received from neighbor for IPv4 Unicast :
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
Capabilities advertised to neighbor for IPv4 Unicast :
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
fall-over enabled
Update source set to Loopback 0
Peer active in peer-group outbound optimization
For address family: IPv4 Unicast
BGP table version 52, neighbor version 52
4 accepted prefixes consume 16 bytes
Prefix advertised 0, denied 0, withdrawn 0
Connections established 6; dropped 5
Last reset 00:19:37, due to Reset by peer
Notification History
'Connection Reset' Sent : 5 Recv: 0
Local host: 200.200.200.200, Local port: 65519
Foreign host: 100.100.100.100, Foreign port: 179
DellEMC#
To verify that fast fall-over is enabled on a peer-group, use the show ip bgp peer-group command (shown in bold).
DellEMC#sh ip bgp peer-group
Peer-group test
fall-over enabled
BGP version 4
Minimum time between advertisement runs is 5 seconds
216
Border Gateway Protocol (BGP)