2. MPLS multicast transfer plan
2.1 MPLS multicast tree
The concept of an MPLS P2MP LSP, also known as an "MPLS tree", is defined in IETF standard RFC4461. An MPLS tree has a head LSR, known as the "root LSR", and one or more destination LSRs, known as "leaf LSRs". Some transit LSRs in the tree have several downstream routers. These LSRs are responsible for MPLS replication, and are called "branch LSRs".
In the following, the terms LSR head/LSR root and LSR destination/LSR leaf will be used interchangeably.
An MPLS tree can, for example, be used to transport an IP multicast group or a set of IP multicast groups. Traffic is injected into the tree by the root LSR, which adds...
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MPLS multicast transfer plan
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