Examine P2MP LSP Tunnel Link Utilization

In a P2MP tunnel distribution tree, packets are replicated at branch points. NorthStar Planner models this precisely to give an accurate accounting of the amount of tunnel bandwidth occupied on the links. As shown in Figure 320 and Figure 322 above, the P2MP LSP tunnel instance C_BLACK is comprised of 100M sub-LSPs. As shown in the following figure, the Link Utilization (based on Tunnels) report shows that each link has 100M of used BW. Thus using P2MP LSPs allows for traffic to be multicast from once source to multiple destinations in a bandwidth efficient manner, as the source nodes does not need to send separate copies to each receiver.

Figure 1: Link Utilization Based on Tunnel Placement