Cisco Systems 78-11741-02 manual Configuring a Multiprotocol BGP Peer Group, IPC-351

Configuring Multiprotocol BGP Extensions for IP Multicast

Multiprotocol BGP Configuration Task List

	Command	Purpose
Step 3
	Router(config-router)#address-family ipv4 multicast	Specifies the IPv4 address family type and places the
		router in address family configuration mode.
Step 4
	Router(config-router-af)# neighbor {ip-address	Enables the neighbor to exchange prefixes for the
	peer-group-name}activate	specified family type with the local router.

Note By default, neighbors that are defined using the neighbor remote-ascommand in router configuration mode exchange only unicast address prefixes. To exchange other address prefix types, such as multicast and VPNv4, neighbors must also be activated using the neighbor activate command in address family configuration mode, as shown.

See the “Multiprotocol BGP Peer Examples” section for multiprotocol BGP peer configuration examples.

Configuring a Multiprotocol BGP Peer Group

To configure a peer group to perform multiprotocol BGP routing, use the following commands beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# router bgp autonomous-system	Configures a BGP routing process and places the
		router in router configuration mode.
Step 2
	Router(config-router)# neighbor peer-group-name	Creates a multiprotocol BGP peer group.
	peer-group
Step 3
	Router(config-router)# neighbor ip-addressremote-as	Adds the IP address of the neighbor in the remote
	autonomous-system-number	autonomous system to the multiprotocol BGP
		neighbor table of the local router.
Step 4
	Router(config-router)# neighbor ip-addresspeer-group	Assigns the IP address of a BGP neighbor to a peer
	peer-group-name	group.
Step 5
	Router(config-router)#address-family ipv4 multicast	Specifies the IP Version 4 address family type and
		places the router in address family configuration
		mode.
Step 6
	Router(config-router-af)# neighbor peer-group-name	Enables the peer group to exchange prefixes for the
	activate	specified family type with the neighbor and the local
		router.
Step 7
	Router(config-router-af)# neighbor ip-address	Assigns the IP address of a BGP neighbor to a peer
	peer-grouppeer-group-name	group.

Note By default, neighbors that are defined using the neighbor remote-ascommand in router configuration mode exchange only unicast address prefixes. To exchange other address prefix types, such as multicast and VPNv4, neighbors must also be activated using the neighbor activate command in address family configuration mode, as shown.

Cisco IOS IP Configuration Guide

IPC-351