LSR 2, is connected to another branch router, LSR 3. Here, LSR 3 is not directly connected
to the ingress router, LSR 1, but only to the branch router, LSR 2. These branch routers,
in turn, replicate the packet and forward it to E Series routers, LSRs 4 through 7, configured
as egress LSRs.
The configuration shown in Figure 61 on page 273 is an example of an LSP that contains
segments that run from ingress LSR to one or more branch and egress LSRs. For example,
sub-LSPs exist between LSR 1 and LSR 2, and between LSR 2 and LSR 4. The sub-LSP
between LSR 2 and LSR 4 is an egress sub-LSP that transmits the replicated packet from
branch router, LSR 2, to egress E Series router, LSR 4. Egress LSRs can also be directly
connected to the ingress LSR. In this figure, the connection between LSR 8 and LSR 1 is
an example of this type.
NOTE: You cannot use E Series routers as core or ingress LSRs. You need to use Juniper
Networks routers running Junos OS to function as core or ingress LSRs in the
point-to-multipoint LSP.
Figure 61: Simple MPLS Domain
Branch routers
Egress routers
LSR 2
LSR 3
LSR 7
LSR 6
LSR 5
LSR 4
g016488
Sub-LSP
Ingress router
LSR 1
Multicast source
LSR 8
Use the show mpls rsvp tunnels p2mp role tail command to view the status and
configuration information for point-to-multipoint egress tunnels.
Related Topics • Monitoring Status and Configuration for MPLS Tunnels on page 368
• Configuring Point-to-Multipoint LSPs on page 317
• show mpls tunnels
273Copyright © 2010, Juniper Networks, Inc.
Chapter 3: MPLS Overview
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