How P2Mp Te Traffic Is Forwarded - Cisco ASR 920 Series Configuration

MPLS Point-to-Multipoint Traffic Engineering

How P2MP TE Traffic Is Forwarded

LSP virtual interface (VIF) is automatically created. The LSP VIF represents the originating interface for all
IP multicast traffic originating from the P2MP TE tailend router.
The figure below shows the LSP signaling process.
Figure 3: How LSPs Are Signaled
How P2MP TE Traffic Is Forwarded
At the headend of the traffic engineering tunnel, through a static Internet Group Management Protocol (IGMP)
group-to-tunnel mapping, IP multicast traffic is encapsulated with a unique MPLS label, which is associated
with the P2MP TE tunnel. The multicast traffic is label switched in the P2MP tree and replicated at branch
and bud nodes along the P2MP tree. When the labeled packet reaches the tailend (a PE router), the MPLS
label is removed and forwarded to the IP multicast tree towards the end point. This process is shown in the
figure below.
MPLS Traffic Engineering Path Calculation and Setup Configuration Guide, Cisco IOS XE Release 3S (Cisco
ASR 920 Series)
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