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This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.
Title : MPLS Traffic Engineering Soft Preemption
Author(s) : M. Meyer, et al.
Filename : draft-ietf-mpls-soft-preemption-08.txt
Pages : 13
Date : 2006-10-26
This document details MPLS Traffic Engineering Soft Preemption, a
suite of protocol modifications extending the concept of preemption
with the goal of reducing/eliminating traffic disruption of preempted
Traffic Engineering Label Switched Paths (TE LSPs). Initially MPLS
RSVP-TE was defined supporting only immediate TE LSP displacement
upon preemption. The utilization of a preemption pending flag helps
more gracefully mitigate the re-route process of preempted TE LSP.
For the brief period soft preemption is activated, reservations
(though not necessarily traffic levels) are in effect under-
provisioned until the TE LSP(s) can be re-routed. For this reason,
the feature is primarily but not exclusively interesting in MPLS
enabled IP networks with Differentiated Services and Traffic
Engineering capabilities.
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