Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

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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.
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If client-to-client reflection is enabled (the default), clients of a route reflector cannot
be members of a peer group.
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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.
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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.
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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.
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See neighbor route-reflector-client.
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 :
• Unicast IPv4—If you do not explicitly specify the address family, the router is configured
to exchange unicast IPv4 addresses by default.
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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.
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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 .
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Multicast IPv6—If you specify the multicast IPv6 address family, you can use BGP to
exchange routing information about how to reach an IPv6 multicast source instead of
Copyright © 2010, Juniper Networks, Inc. 150
JunosE 11.2.x BGP and MPLS Configuration Guide