Juniper JUNOSE, Configuration Manual

Page: 296 / 738

Point-to-Multipoint LSPs Configuration
To set up a point-to-multipoint LSP, you configure the primary LSP from the ingress
router and the branch LSPs that carry traffic to the egress routers. The configuration
of the primary point-to-multipoint LSP is similar to a signaled LSP. In addition to the
conventional LSP configuration, you specify a path name on the primary LSP and
this same path name on each branch LSP. By default, the branch LSPs are dynamically
signaled by means of CSPF and require no configuration. You can alternatively
configure the branch LSPs as a static path.
Because E Series routers can only function as egress routers, you must use M-series
routers running JUNOS software 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.
Configuring an E Series Router as an Egress Router
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.
260 ■
Point-to-Multipoint LSPs Configuration
JUNOSe 11.0.x BGP and MPLS Configuration Guide