Cisco Systems 78-11741-02 manual Configuring a Multiprotocol BGP Route Reflector, IPC-356

Configuring Multiprotocol BGP Extensions for IP Multicast

Multiprotocol BGP Configuration Task List

Configuring a Multiprotocol BGP Route Reflector

To configure a local router as a route reflector of multiprotocol BGP prefixes, 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 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 3
	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 4
	Router(config-router-af)# neighbor ip-address	Enables the specified address family for the neighbor
	activate	in the remote autonomous system.
Step 5
	Router(config-router-af)# neighbor ip-address	Configures the router as a route reflector of prefixes
	route-reflector-client	for the specified address family type and configures
		the specified neighbor as its client.

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.

Note Route reflectors and clients (neighbors or internal BGP peer groups) that are defined in router configuration mode using the neighbor route-reflector-clientcommand reflect unicast address prefixes to and from those clients by default. To reflect prefixes for other address families, such as multicast, define the reflectors and clients in address family configuration mode using the neighbor route-reflector-clientcommand, as shown.

See the “Multiprotocol BGP Route Reflector Examples” section for multiprotocol BGP route reflector configuration examples.

Configuring Aggregate Multiprotocol BGP Addresses

The tasks in this section explain how to configure an aggregate address for multiprotocol BGP. Specifically, the tasks in this section explain how to inject an aggregate address into the multicast database, the unicast database, or both.

Cisco IOS IP Configuration Guide

IPC-356