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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).
Dell(conf-router_bgp)#neighbor zanzibar peer-group
Dell(conf-router_bgp)#show conf
!
router bgp 45
bgp fast-external-fallover
bgp log-neighbor-changes
neighbor zanzibar peer-group
neighbor zanzibar 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
Dell(conf-router_bgp)#
To enable a peer group, use the neighbor peer-group-name no shutdown command in
CONFIGURATION ROUTER BGP mode (shown in bold).
Dell(conf-router_bgp)#neighbor zanzibar no shutdown
Dell(conf-router_bgp)#show config
!
router bgp 45
bgp fast-external-fallover
bgp log-neighbor-changes
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
Dell(conf-router_bgp)#
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.
Dell>show ip bgp peer-group
Peer-group zanzibar, remote AS 65535
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 26
Peer-group members (* - outbound optimized):
Border Gateway Protocol IPv4 (BGPv4)
175