Configuring Multiprotocol BGP Extensions forIP Multicast
Multiprotocol BGP Configuration Task List
IPC-356
Cisco IOS IP Configuration Guide
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:
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 reflectors and clients (neighbors or internal BGP peer groups) that are defined in router
configuration mode using the neighbor route-reflector-client command 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-client command, 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.
Command Purpose
Step1 Router(config)# router bgp autonomous-system Configures a BGP routing process and places the
router in router configuration mode.
Step2 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.
Step3 Router(config-router)# address-family ipv4 multicast Specifies the IP Version 4 address family type and
places the router in address family configuration
mode.
Step4 Router(config-router-af)# neighbor ip-address
activate
Enables the specified address family for the neighbor
in the remote autonomous system.
Step5 Router(config-router-af)# neighbor ip-address
route-reflector-client
Configures the router as a route reflector of prefixes
for the specified address family type and configures
the specified neighbor as its client.