Users Guide

CONFIG-ROUTERBGP mode
neighbor peer-group-name no shutdown
By default, all peer groups are disabled.
3 Create a BGP neighbor.
CONFIG-ROUTERBGP mode
neighbor ip-address remote-as as-number
4 Enable the neighbor.
CONFIG-ROUTERBGP mode
neighbor ip-address no shutdown
5 Add an enabled neighbor to the peer group.
CONFIG-ROUTERBGP mode
neighbor ip-address peer-group peer-group-name
6 Add a neighbor as a remote AS.
CONFIG-ROUTERBGP mode
neighbor {ip-address | peer-group name} remote-as as-number
Formats: IP Address A.B.C.D
• Peer-Group Name: 16 characters.
• as-number: the range is from 0 to 65535 (2-Byte) or 1 to 4294967295 | 0.1 to 65535.65535 (4-Byte) or 0.1 to 65535.65535
(Dotted format)
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.
Examples of Working with Peer Groups
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 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 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.
Border Gateway Protocol IPv4 (BGPv4) 191