Administrator Guide

Prefix advertised 0, denied 0, withdrawn 0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
Dell#
To verify that fast fall-over is enabled on a peer-group, use the show ip bgp peer-group command (shown in bold).
Dell#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*
Dell#
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
Dell#
Conguring 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 responds to an OPEN message.
When a passive peer-group rejects a BGP neighbor connection with authentication congured, Dell Networking OS does not allow another
passive peer-group on the same subnet to connect with the BGP neighbor. To work around this, change the BGP conguration or change
the order of the peer group conguration.
You can constrain the number of passive sessions the neighbor accepts. The limit keyword allows you to set the total number of
sessions the neighbor accepts, between 2 and 265. The default is 256 sessions.
1 Congure a peer group that does not initiate TCP connections with other peers.
CONFIG-ROUTER-BGP mode
neighbor peer-group-name peer-group passive limit
Enter the limit keyword to restrict the number of sessions accepted.
2 Assign a subnet to the peer group.
CONFIG-ROUTER-BGP mode
neighbor peer-group-name subnet subnet-number mask
The peer group responds to OPEN messages sent on this subnet.
188
Border Gateway Protocol IPv4 (BGPv4)