Administrator Guide

When you add a peer to a peer group, it inherits all the peer group’s congured parameters.
A neighbor cannot become part of a peer group if it has any of the following commands congured:
• neighbor advertisement-interval
• neighbor distribute-list out
• neighbor filter-list out
• neighbor next-hop-self
• neighbor route-map out
• neighbor route-reflector-client
•
neighbor send-community
A neighbor may keep its conguration after it was added to a peer group if the neighbor’s conguration is more specic than the peer
group’s and if the neighbor’s conguration does not aect outgoing updates.
NOTE: When you congure 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
conguration, 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
conguration 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
194
Border Gateway Protocol IPv4 (BGPv4)