An overview of the RSVP-TE P2MP extensions,
their application to IPTV,
and support for other (G)MPLS features
Nic Neate, firstname.lastname@example.org
First issued March 2009
100 Church Street, Enfield, England, EN2 6BQ| www.metaswitch.com
The rise of broadcast IPTV has created requirements for efficient and reliable
multicast transport, with guaranteed Quality of Service, through service provider
core networks. RSVP-TE point-to-multipoint (P2MP) LSPs are a good functional fit
to these requirements, and this emerging market presents a strong case for their
The RSVP-TE P2MP extensions allow efficient multicast distribution, with
traffic duplication occurring as close to the receivers as possible.
Traffic Engineering support means that dedicated network bandwidth is
reserved. Further, the P2MP LSPs can be explicitly routed for optimal
usage of resources.
Mechanisms for advanced function such as resilience to network failures
are being developed.
However, there are competing technologies. IP multicast, for example, meets
many of these requirements. It also benefits from being more widely deployed
than multicast MPLS, and it too is being extended to provide some level of
While the protocol definition for P2MP support in RSVP-TE provides a broad range
of function, it is also highly complex. This complexity may hinder
interoperability. High quality, flexible and robust implementations will be
Further, there are still gaps in the standards which will need to be filled before
fully interoperable implementations of some function, such as protection and
restoration of data streams using redundant P2MP LSPs, are possible.
100 Church Street, Enfield, England, EN2 6BQ | www.metaswitch.com