[rfc-dist] RFC 5712 on MPLS Traffic Engineering Soft Preemption

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Thu Jan 14 23:09:15 PST 2010


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        RFC 5712

        Title:      MPLS Traffic Engineering Soft Preemption 
        Author:     M. Meyer, Ed.,
                    JP. Vasseur, Ed.
        Status:     Standards Track
        Date:       January 2010
        Mailbox:    matthew.meyer at bt.com, 
                    jpv at cisco.com
        Pages:      13
        Characters: 27371
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-mpls-soft-preemption-18.txt

        URL:        http://www.rfc-editor.org/rfc/rfc5712.txt

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 or
eliminating traffic disruption of preempted Traffic Engineering Label
Switched Paths (TE LSPs).  Initially, MPLS RSVP-TE was defined with
support for only immediate TE LSP displacement upon preemption.  The
utilization of a reroute request notification helps more gracefully
mitigate the reroute 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 rerouted.  For this reason, the feature is
primarily, but not exclusively, interesting in MPLS-enabled IP
networks with Differentiated Services and Traffic Engineering
capabilities.  [STANDARDS TRACK]

This document is a product of the Multiprotocol Label Switching Working Group of the IETF.

This is now a Proposed Standard Protocol.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol.  Distribution of this memo is unlimited.

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