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Configuring Multiprotocol BGP Extensions for IP Multicast
Multiprotocol BGP Configuration Task List
IPC-353
Cisco IOS IP Configuration Guide
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:
Note By default, neighbors that are defined using the neighbor remote-as command 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-map command
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-map
command, 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.
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-address remote-as
autonomous-system-number
Adds the IP address of the neighbor in the remote
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
activate
Enables the address family for the neighbor in the
remote autonomous system.
Step 5
Router(config-router-af)# neighbor ip-address
route-map route-map-name {in | out}
Applies a route map to incoming or outgoing routes.
Step 6
Router(config)# route-map map-tag [permit | deny]
[sequence-number]
Defines a route map.
Step 7
Router(config-route-map)# match ip-address
access-list-number
Distributes any routes that have a destination network
number address permitted by a standard or extended
access list, or performs policy routing on packets.