Configuring Bgp Multicasting - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

Configuring BGP Multicasting

The BGP multiprotocol extensions (MP-BGP) enable BGP to carry IP multicast routes
used by the Protocol Independent Multicast (PIM) to build data distribution trees.
(See JUNOSe Multicast Routing Configuration Guide for information about PIM.) You
can configure a multicast routing topology different from your unicast topology to
achieve greater control over network resources. This application of MP-BGP is often
referred to as multicast BGP (MBGP).
The BGP multiprotocol extensions specify that BGP can exchange information within
different types of address families:
Use to configure the local router as the route reflector and the specified neighbor
as one of its clients. The reflector and its clients constitute a cluster. BGP
neighbors that are not specified as clients are nonclients.
Route reflectors pass routes among the client routers.
Route reflection eliminates the need for all IBPG peers to be fully meshed. The
members of a cluster do not have to be fully meshed, but BGP speakers outside
the cluster must be fully meshed.
If client-to-client reflection is enabled (the default), clients of a route reflector
cannot be members of a peer group.
If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command. You cannot override this inheritance for a peer group member.
Changes apply automatically to any routes received after you issue the command.
To advertise or withdraw routes that are already present in the BGP routing table,
you must use the clear ip bgp command to issue a hard clear or an outbound
soft clear.
Use the no version to indicate that the neighbor is no longer a client. Use the
default version to remove the explicit configuration from the peer or peer group
and reestablish inheritance of the feature configuration.
See neighbor route-reflector-client.
Unicast IPv4 If you do not explicitly specify the address family, the router is
configured to exchange unicast IPv4 addresses by default.
Multicast IPv4 If you specify the multicast IPv4 address family, you can use
BGP to exchange routing information about how to reach a multicast source
instead of a unicast destination. For information about BGP multicasting
commands, see "Configuring BGP Routing" on page 3. For a general description
of multicasting, see JUNOSe Multicast Routing Configuration Guide.
VPN IPv4 If you specify the VPN-IPv4 (also known as VPNv4) address family,
you can configure the router to provide IPv4 VPN services over an MPLS
backbone. These VPNs are often referred to as BGP/MPLS VPNs.
Unicast IPv6 If you specify the IPv6 unicast address family, you can configure
the router to exchange unicast IPv6 routes. For a description of IPv6, see JUNOSe
IP, IPv6, and IGP Configuration Guide.
Chapter 1: Configuring BGP Routing
Configuring BGP Multicasting
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