I-D ACTION:draft-lee-ccamp-rsvp-te-exclude-route-01.txt

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	Title		: Exclude Routes - Extension to RSVP-TE
	Author(s)	: C. Lee, A. Farrel, S. De Cnodder
	Filename	: draft-lee-ccamp-rsvp-te-exclude-route-01.txt
	Pages		: 14
	Date		: 2002-11-6
	
The current RSVP-TE specification [RSVP-TE] and GMPLS extensions
[GMPLS-RSVP-TE] allow abstract nodes and resources to be explicitly
included in a path setup, but not to be explicitly excluded.
In some systems where precise explicit paths are not computed at the
head end it may be useful to specify and signal abstract nodes and
resources that are to be explicitly excluded from routes.  These
exclusions may apply to the whole of a path, or to parts of a path
between two abstract nodes specified in an explicit route.
Shared Risk Link Groups (SRLGs) allow the definition of resources or
groups of resources that share the same risk of failure.  The
knowledge of SRLGs may be used to compute diverse paths that can be
used for protection.  In systems where it is useful to signal
exclusions, it may be useful to signal SRLGs to indicate groups of
resources that should be excluded on the whole of a path or between
two abstract nodes specified in an explicit path.
This draft specifies ways to communicate route exclusions during path
setup using RSVP-TE.
These approaches are equally applicable to other MPLS TE signaling
protocols such as CR-LDP.

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