Cisco Systems 78-11741-02 manual Advertising Routes into Multiprotocol BGP, IPC-352

Configuring Multiprotocol BGP Extensions for IP Multicast

Multiprotocol BGP Configuration Task List

Note Peer groups that are defined in router configuration mode using the neighbor peer-groupcommand exchange only unicast address prefixes by default. To exchange other address prefix types, such as multicast, peer groups must be defined in address family configuration mode using the neighbor activate command, as shown.

Members of a peer group automatically inherit the address prefix configuration of the peer group.

Refer to the section “Configure BGP Peer Groups” of the “Configuring BGP” chapter in the Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols for information and instructions on assigning options to the peer group and making a BGP or multiprotocol BGP neighbor a member of the peer group.

See the “Multiprotocol BGP Peer Group Examples” section for an example of configuring multiprotocol BGP peer groups.

Advertising Routes into Multiprotocol BGP

To advertise (inject) a network number and mask into multiprotocol BGP, 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)#address-family ipv4 multicast	Specifies the IP Version 4 address family type and
		places the router in address family configuration
		mode.
Step 3
	Router(config-router-af)# network network-number	Advertises (injects) this network number and mask
	[mask network-mask]	into the multicast BGP database. (The routes must
		first be found in the unicast forwarding table.)
		Specifically, the network number and mask are
		injected into the multicast database for the address
		family specified in the previous step.
		Routes are tagged from the specified network as
		“local origin.”

Note Networks that are defined in router configuration mode using the network command are injected into the unicast database by default. To inject a network into another database, such as the multicast database, the network must be defined in address family configuration mode using the network command, as shown.

To redistribute Distance Vector Multicast Routing Protocol (DVMRP) routes into multiprotocol BGP, see the “Redistributing DVMRP Routes into Multiprotocol BGP” section. See the “Multiprotocol BGP Network Advertisement Examples” section for multiprotocol BGP network advertisement configuration examples.

Cisco IOS IP Configuration Guide

IPC-352