Reference Guide

218 | Border Gateway Protocol IPv4 (BGPv4)
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Use the show ip bgp peer-group command to verify that fast fall-over is enabled on a peer-group.
Figure 9-23. Command example: show ip bgp peer-group
Configure passive peering
When you enable a peer-group, the software sends an OPEN message to initiate a TCP connection. If you
enable passive peering for the peer group, the software does not send an OPEN message, but it will
respond to an OPEN message.
When a BGP neighbor connection with authentication configured is rejected by a passive peer-group,
FTOS does not allow another passive peer-group on the same subnet to connect with the BGP neighbor. To
work around this, change the BGP configuration or change the order of the peer group configuration.
You can constrain the number of passive sessions accepted by the neighbor. The
limit keyword allows you
to set the total number of sessions the neighbor will accept, between 2 and 265. The default is 256 sessions.
Use these commands in the following sequence, starting in the CONFIGURATION ROUTER BGP mode
to configure passive peering.
Step Command Syntax Command Mode Purpose
1
neighbor peer-group-name
peer-group passive limit
CONFIG-ROUTER-
BGP
Configure a peer group that does not initiate TCP
connections with other peers. Enter the limit
keyword to restrict the number of sessions
accepted.
FTOS#sh ip bgp peer-group
Peer-group test
Fall-over enabled
BGP version 4
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP neighbor is test
Number of peers in this group 1
Peer-group members (* - outbound optimized):
100.100.100.100*
FTOS#
router bgp 65517
Fast Fall-Over Indicator