Dell Force10 C150 Configuration Manual page 238

Figure 10-23. Command example: show ip bgp peer-group
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
neighbor test peer-group
neighbor test fall-over
neighbor test no shutdown
neighbor 100.100.100.100 remote-as 65517
neighbor 100.100.100.100 fall-over
neighbor 100.100.100.100 update-source Loopback 0
neighbor 100.100.100.100 no shutdown
FTOS#
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.
Use these commands in the following sequence, starting in the CONFIGURATION ROUTER BGP mode
to configure passive peering.
Step Command Syntax
neighbor peer-group-name
1
peer-group passive
neighbor peer-group-name subnet
2
subnet-number mask
238 | Border Gateway Protocol IPv4 (BGPv4)
Fast Fall-Over Indicator
Command Mode
CONFIG-ROUTER-
[ ]
match-af
BGP
CONFIG-ROUTER-
BGP
Purpose
Configure a peer group that does not initiate TCP
connections with other peers.
match-af
(Optional) Enter the
restrict the peer adjacency established in the
match-af
passive peer group.
peer's address family matches the address family
of the subnet assigned to the peer group (Step 2)
before a peering session is brought up.
Assign a subnet to the peer group. The peer
group will respond to OPEN messages sent on
this subnet.
keyword to
requires that a