A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.
Title : MPLS Traffic Engineering Soft Preemption
Author(s) : D. Maddux, et al.
Filename : draft-ietf-mpls-soft-preemption-12.txt
Pages : 14
Date : 2008-09-01
This document specifies Multiprotocol Label Switching (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 reroute request notification 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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