The deployment of IP multicast-based services may have to deal with L2TP tunnel engineering. The forwarding of multicast data within L2TP sessions may impact the throughput of L2TP tunnels because the same traffic may be sent multiple times within the same L2TP tunnel, but in different sessions. This proposal aims to reduce the impact by applying the replication mechanism of multicast traffic only when necessary.
The solution described herein provides a mechanism for transmitting multicast data only once for all the L2TP sessions that have been established in a tunnel, each multicast flow having a dedicated L2TP session.
Within the context of deploying IP multicast-based services, it is assumed that the routers of the IP network that embed a L2TP Network Server (LNS) capability may be involved in the forwarding of multicast data, toward users who access the network through an L2TP tunnel. The LNS is in charge of replicating the multicast data for each L2TP session that a receiver who has requested a multicast flow uses. In the solution described here, an LNS is able to send multicast data only once and to let the L2TP Access Concentrator (LAC) perform the traffic replication. By doing so, it is expected to spare transmission resources in the core network that supports
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