Label Distribution Protocol Extensions for Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths
This RFC 6388 was published in 2011
This document describes extensions to the Label Distribution Protocol (LDP) for the setup of point-to-multipoint (P2MP) and multipoint-to- multipoint (MP2MP) Label Switched Paths (LSPs) in MPLS networks.
These extensions are also referred to as multipoint LDP.
Multipoint LDP constructs the P2MP or MP2MP LSPs without interacting with or relying upon any other multicast tree construction protocol.
Protocol elements and procedures for this solution are described for building such LSPs in a receiver-initiated manner.
There can be various applications for multipoint LSPs, for example IP multicast or support for multicast in BGP/MPLS Layer 3 Virtual Private Networks (L3VPNs).
Specification of how such applications can use an LDP signaled multipoint LSP is outside the scope of this document.
RFC 6388 introduction
The LDP protocol is described in [RFC5036].
It defines mechanisms for setting up point-to-point (P2P) and multipoint-to-point (MP2P) LSPs in the network.
This document describes extensions to LDP for setting up point-to-multipoint (P2MP) and multipoint-to-multipoint (MP2MP) LSPs.
These are collectively referred to as multipoint LSPs (MP LSPs).
A P2MP LSP allows traffic from a single root (or ingress) node to be delivered to a number of leaf (or egress) nodes.
An MP2MP LSP allows traffic from multiple ingress nodes to be delivered to multiple egress nodes.
Only a single copy of the packet will be sent to an LDP neighbor traversed by the MP LSP.
This is accomplished without the use of a multicast protocol in the network.
There can be
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