Install Guide

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.
● Enable BGP fast fall-over.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address | peer-group-name} fall-over
To disable fast fall-over, use the [no] neighbor [ip-address | ipv6-address | peer-group] fall-over
command in CONFIGURATION ROUTER BGP mode.
DellEMC# configure terminal
DellEMC(conf)# router bgp 400
DellEMC(conf-router_bgp)# neighbor 10.10.10.1 remote-as 500
DellEMC(conf-router_bgp)# neighbor 10.10.10.1 fall-over
DellEMC(conf-router_bgp)# exit
DellEMC(conf-router_bgp)#
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#show ip bgp neighbors
BGP neighbor is 10.10.10.1, remote AS 500, 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Prefix advertised 0, denied 0, withdrawn 0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: 20.20.20.2, Local port: 65519
Foreign host: 10.10.10.1, Foreign port: 179
DellEMC#
172
Border Gateway Protocol (BGP)