A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Reoptimization of MPLS Traffic Engineering loosely
routed explicit LSP paths
Author(s) : J. Vasseur, Y. Ikejiri
Filename : draft-vasseur-mpls-loose-path-reopt-02.txt
Pages : 10
Date : 2003-6-27
The aim of this document is to propose a mechanism for the
reoptimization of MPLS Traffic Engineering loosely routed explicit LSP
paths. A loosely routed explicit LSP path is a path specified as a
combination of strict and loose hop(s) that contains at least one loose
hop and zero or more strict hop(s). The path calculation (which implies
ERO expansion) to reach a loose hop is made on the previous hop defined
in the TE LSP path. This draft proposes a mechanism that allows:
- The TE LSP Head-end LSR to trigger a new ERO expansion on every
hop having a next hop defined as a loose hop,
- An LSR to signal to the TE LSP head-end that a better path exists
to reach a loose hop (than the current path in use). A better path
is defined as a path with a lower cost, where the cost is determined
by the metric used to compute the path.
This primarily applies to inter-area TE LSPs and inter-AS TE LSPs when
the path is defined as a list of loose hops (generally the loose hops
are the ABRs/ASBRs) but the following mechanism is also applicable to
any loosely routed explicit path within a single routing domain.
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