Cisco Systems 3750E Configuring BGP Neighbors and Peer Groups, Set comm-list list-num delete

Chapter 38 Configuring IP Unicast Routing

Configuring BGP

	Command	Purpose
Step 5
	set comm-list list-numdelete	(Optional) Remove communities from the community attribute of an
		inbound or outbound update that match a standard or extended
		community list specified by a route map.
Step 6
	exit	Return to global configuration mode.
Step 7
	ip bgp-community new-format	(Optional) Display and parse BGP communities in the format AA:NN.
		A BGP community is displayed in a two-part format 2 bytes long. The
		Cisco default community format is in the format NNAA. In the most
		recent RFC for BGP, a community takes the form AA:NN, where the
		first part is the AS number and the second part is a 2-byte number.
Step 8
	end	Return to privileged EXEC mode.
Step 9
	show ip bgp community	Verify the configuration.
Step 10
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Configuring BGP Neighbors and Peer Groups

Often many BGP neighbors are configured with the same update policies (that is, the same outbound route maps, distribute lists, filter lists, update source, and so on). Neighbors with the same update policies can be grouped into peer groups to simplify configuration and to make updating more efficient. When you have configured many peers, we recommend this approach.

To configure a BGP peer group, you create the peer group, assign options to the peer group, and add neighbors as peer group members. You configure the peer group by using the neighbor router configuration commands. By default, peer group members inherit all the configuration options of the peer group, including the remote-as (if configured), version, update-source, out-route-map, out-filter-list, out-dist-list, minimum-advertisement-interval, and next-hop-self. All peer group members also inherit changes made to the peer group. Members can also be configured to override the options that do not affect outbound updates.

To assign configuration options to an individual neighbor, specify any of these router configuration commands by using the neighbor IP address. To assign the options to a peer group, specify any of the commands by using the peer group name. You can disable a BGP peer or peer group without removing all the configuration information by using the neighbor shutdown router configuration command.

Beginning in privileged EXEC mode, use these commands to configure BGP peers:

	Command		Purpose
Step 1	configure terminal		Enter global configuration mode.
Step 2	router bgp autonomous-system		Enter BGP router configuration mode.
Step 3	neighbor peer-group-namepeer-group		Create a BGP peer group.
Step 4	neighbor ip-addresspeer-group		Make a BGP neighbor a member of the peer group.
	peer-group-name
Step 5	neighbor {ip-address peer-group-name}		Specify a BGP neighbor. If a peer group is not configured with a
	remote-as number		remote-asnumber, use this command to create peer groups
			containing EBGP neighbors. The range is 1 to 65535.
Step 6	neighbor {ip-address peer-group-name}		(Optional) Associate a description with a neighbor.
	description text
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
38-58			OL-9775-02