Cisco ASR 920 Series Configuration page 19

Aggregation services router

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MPLS Point-to-Multipoint Traffic Engineering

The P2MP TE feature does not support penultimate-hop popping. Therefore, the egress router must allocate

Note

an explicit null or non-null label.

Figure 4: How Packets Traverse the P2MP Tree

When sub-LSPs share a common router (branch point) and use the same ingress interface of the router, the

same MPLS label is used for forwarding. The multicast state is built by reusing the MPLS labels at the branch

points, as shown in the figure below, where MPLS label 17 is shared by two sub-LSPs that both use router

Figure 5: Reusing MPLS Labels in Branch Points

MPLS Traffic Engineering Path Calculation and Setup Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR

How P2MP TE Traffic Is Forwarded

920 Series)

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