Cisco Systems 78-11741-02 manual Configuring Route Maps for Multiprotocol BGP Prefixes, IPC-353

Configuring Multiprotocol BGP Extensions for IP Multicast

Multiprotocol BGP Configuration Task List

Configuring Route Maps for Multiprotocol BGP Prefixes

To configure a route map for 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 address family for the neighbor in the
	activate	remote autonomous system.
Step 5
	Router(config-router-af)# neighbor ip-address	Applies a route map to incoming or outgoing routes.
	route-map route-map-name{in out}
Step 6
	Router(config)# route-map map-tag[permit deny]	Defines a route map.
	[sequence-number]
Step 7
	Router(config-route-map)# match ip-address	Distributes any routes that have a destination network
	access-list-number	number address permitted by a standard or extended
		access list, or performs policy routing on packets.

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 maps that are applied in router configuration mode using the neighbor route-mapcommand are applied to unicast address prefixes by default. Route maps for other address families, such as multicast, must be applied in address family configuration mode using the neighbor route-mapcommand, as shown. The route maps are applied either as the inbound or outbound routing policy for neighbors under each address family. Configuring separate route maps under each address family simplifies managing complicated or different policies for each address family.

See the “Multiprotocol BGP Route Map Examples” section for multiprotocol BGP route map configuration examples.

Redistributing Prefixes into Multiprotocol BGP

Redistribution is the process of injecting prefixes from one routing protocol into another routing protocol. The tasks in this section explain how to inject prefixes from a routing protocol into multiprotocol BGP. Specifically, prefixes that are redistributed into multiprotocol BGP using the redistribute command are injected into the unicast database, the multicast database, or both.

Cisco IOS IP Configuration Guide

IPC-353