Cisco Systems 78-11741-02 BGP Configuration Examples, Logging Changes in Neighbor Status, IPC-332

Configuring BGP

BGP Configuration Examples

To display various routing statistics, use the following commands in EXEC mode, as needed:

Command	Purpose
Router# show ip bgp prefix	Displays peer groups and peers not in peer groups to which
	the prefix has been advertised. Also displays prefix attributes
	such as the next hop and the local prefix.
Router# show ip bgp cidr-only	Displays all BGP routes that contain subnet and supernet
	network masks.
Router# show ip bgp community community-number	Displays routes that belong to the specified communities.
[exact]
Router# show ip bgp community-list	Displays routes that are permitted by the community list.
community-list-number [exact]
Router# show ip bgp filter-list access-list-number	Displays routes that are matched by the specified autonomous
	system path access list.
Router# show ip bgp inconsistent-as	Displays the routes with inconsistent originating autonomous
	systems.
Router# show ip bgp regexp regexp	Displays the routes that have an autonomous system path that
	matches the specified regular expression entered on the
	command line.
Router# show ip bgp	Displays the contents of the BGP routing table.
Router# show ip bgp neighbors [neighbor-address]	Displays detailed information on the BGP and TCP
	connections to individual neighbors.
Router# show ip bgp neighbors [address]	Displays routes learned from a particular BGP neighbor.
[received-routes routes advertised-routes
paths regexp dampened-routes]
Router# show ip bgp paths	Displays all BGP paths in the database.
Router# show ip bgp peer-group [tag] [summary]	Displays information about BGP peer groups.
Router# show ip bgp summary	Displays the status of all BGP connections.

Logging Changes in Neighbor Status

To enable the logging of messages generated when a BGP neighbor resets, comes up, or goes down, use the following command in router configuration mode:

Command	Purpose
Router(config-router)#bgp log-neighbor-changes	Logs messages generated when a BGP neighbor goes up or
	down, or resets

BGP Configuration Examples

The following sections provide BGP configuration examples:

•BGP Route Map Examples

•BGP Neighbor Configuration Examples

Cisco IOS IP Configuration Guide

IPC-332