Users Guide

A neighbor may keep its configuration after it was added to a peer group if the neighbor’s configuration is more specific than
the peer group’s and if the neighbor’s configuration does not affect outgoing updates.
NOTE: When you configure a new set of BGP policies for a peer group, always reset the peer group by entering the clear
ip bgp peer-group peer-group-name command in EXEC Privilege mode.
To view the configuration, use the show config command in CONFIGURATION ROUTER BGP mode.
When you create a peer group, it is disabled (shutdown). The following example shows the creation of a peer group (zanzibar)
(in bold). To enable a peer group, use the neighbor peer-group-name no shutdown command.
DellEMC(conf)# router bgp 45
DellEMC(conf-router_bgp)# neighbor zanzibar peer-group
DellEMC(conf-router_bgp)# neighbor zanzibar no shutdown
DellEMC(conf-router_bgp)# neighbor 10.1.1.1 remote-as 65535
DellEMC(conf-router_bgp)# neighbor 10.1.1.1 no shutdown
DellEMC(conf-router_bgp)# neighbor 10.14.8.60 remote-as 18505
DellEMC(conf-router_bgp)# neighbor 10.14.8.60 no shutdown
DellEMC(conf-router_bgp)# neighbor 2001::1 peer-group zanzibar
Following is the show config output for the above sample configuration.
DellEMC# show config
!
router bgp 45
neighbor zanzibar peer-group
neighbor zanzibar no shutdown
neighbor 10.1.1.1 remote-as 65535
neighbor 10.1.1.1 shutdown
neighbor 10.14.8.60 remote-as 18505
neighbor 10.14.8.60 no shutdown
neighbor 2001::1 peer-group zanzibar
DellEMC#
To disable a peer group, use the neighbor peer-group-name shutdown command in CONFIGURATION-ROUTER-BGP
mode. The configuration of the peer group is maintained, but it is not applied to the peer group members. When you disable a
peer group, all the peers within the peer group that are in the ESTABLISHED state move to the IDLE state.
To view the status of peer groups, use the show ip bgp peer-group command in EXEC Privilege mode, as shown in the
following example.
DellEMC>show ip bgp peer-group
Peer-group zanzibar
BGP version 4
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP neighbor is zanzibar, peer-group internal,
Number of peers in this group 1
Peer-group members (* - outbound optimized):
2001::1
Example-Configuring BGP peer groups
The following example configurations show how to enable BGP and set up some peer groups. These examples are not
comprehensive directions. They are intended to give you some guidance with typical configurations.
To support your own IP addresses, interfaces, names, and so on, you can copy and paste from these examples to your CLI. Be
sure that you make the necessary changes.
The following illustration shows the configurations described on the following examples. These configurations show how to
create BGP areas using physical and virtual links. They include setting up the interfaces and peers groups with each other.
Figure 24. BGP peer group example configurations
Border Gateway Protocol (BGP)
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