Reference Guide

Border Gateway Protocol IPv4 (BGPv4) | 207
After you create a peer group, you can use any of the commands beginning with the keyword neighbor to
configure that peer group.
When you add a peer to a peer group, it inherits all the peer group’s configured parameters.
A neighbor
cannot become part of a peer group if it has any of the following commands are configured:
• 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 configuration after it was added to a peer group if the neighbor’s configuration is
more specific than the peer group’s, and the neighbor’s configuration does not affect outgoing updates.
Use the
show config command in the CONFIGURATION ROUTER BGP mode to view the
configuration. When you create a peer group, it is disabled (
shutdown). The following example shows the
creation of a peer group (zanzibar).
FTOS(conf-router_bgp)#neighbor zanzibar peer-group
FTOS(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
FTOS(conf-router_bgp)#
To add an external BGP (EBGP) neighbor, configure the as-number
parameter with a number different from the BGP as-number configured
in the router bgp as-number command.
To add an internal BGP (IBGP neighbor, configure the as-number
parameter with the same BGP as-number configured in the router bgp
as-number command.
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.
Step Command Syntax Command Mode Purpose