Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

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Because E Series routers can only function as egress routers, you must use M-series
routers running Junos OS as ingress routers to enable point-to-multipoint LSPs to send
packets through the network to the endpoints connected to the egress routers.
Observe the following guidelines to deliver multicast data using point-to-multipoint LSPs
on the egress E Series routers:
• The IP interface on which the packet arrives must be an IGMP-owned interface. An
IGMP-owned interface refers to an interface in which IGMP is the only multicast protocol
enabled.
•
The actual route to the source must be through an IGMP-owned interface.
The configuration of an E Series router as an egress router depends on the type of label
advertised for the LSR that is the egress router for the prefix. Penultimate hop popping
(PHP) is the default when RSVP-TE or LDP is the signaling protocol.
If the egress router advertises an implicit null label to achieve PHP on an upstream
neighbor, enable IP IGMP on the static physical interface on which the unlabeled multicast
packet is received by the router by using the
ip igmp interface configuration command.
host1(config-if)# ip igmp
If the egress router advertises an explicit null or non-null label to its upstream neighbour
to include a label in all MPLS packets, complete the following steps to configure an
E Series router as an egress router:
1.
Create a profile by using the profile command. Add commands to enable IP IGMP
and IP processing on the loopback interface in the profile.
host1(config)# profile mplsdynip
host1(config-profile)# ip igmp
host1(config-profile)# ip unnumbered loopback 0
2.
Create a dynamic IPv4 interface on top of MPLS major interfaces and specify the
profile that you created in the previous step to set attributes for this interface.
host1(config)# mpls create-dynamic-interfaces ip on-major-interfaces profile dynip
For all types of labels that are advertised for the LSR that is the egress router for the
prefix, you must complete the following steps, in addition to those detailed earlier, on
the E Series router:
1.
Enable IGMP on the interface which owns the route to the source by using the ip
igmp command. Because the route to the source can change dynamically, we
recommend that you enable IGMP on all interfaces of the router or, at least, on all
interfaces that might be the next hop interface to the source.
2.
Disable the multicast reverse path forwarding (RPF) check policy for all the streams
that will be delivered on the point-to-multipoint LSP by using the
ip multicast-routing
disable-rpf-check command. For more information, see Enabling and Disabling RPF
Checks in the JunosE Multicast Routing Configuration Guide .
Copyright © 2010, Juniper Networks, Inc. 318
JunosE 11.2.x BGP and MPLS Configuration Guide