Using E-Series Routers as Egress LSRs

You can use E-series routers as egress LSRs in a point-to-multipoint LSP. To create a point-to-multipoint LSP and to use E-series routers as egress LSRs, no special configuration is required. The configuration that you made for point-to-point LSPs, which enables MPLS RSVP-TE on the interface that must signal an LSP in that virtual router context, is sufficient.

Figure 59 shows a point-to-multipoint LSP with multiple egress LSRs. The multicast source sends a packet to the ingress router, LSR 1, which in turn sends the packet on the point-to-multipoint LSP to the branch router, LSR 2. The branch router, 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 59 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 software to function as core or ingress LSRs in the point-to-multipoint LSP.

Figure 59: Simple MPLS Domain

Use the show mpls rsvp tunnels p2mp role tail command to view the status and configuration information for point-to-multipoint egress tunnels.

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