RFC 4736 on Reoptimization of Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Loosely Routed Label Switched Path (LSP)

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        RFC 4736

        Title:      Reoptimization of Multiprotocol Label Switching 
                    (MPLS) Traffic Engineering (TE) Loosely Routed 
                    Label Switched Path (LSP) 
        Author:     JP. Vasseur, Ed.,
                    Y. Ikejiri, R. Zhang
        Status:     Informational
        Date:       November 2006
        Mailbox:    jpv@cisco.com, 
                    y.ikejiri@ntt.com, 
                    raymond_zhang@bt.infonet.com
        Pages:      14
        Characters: 28850
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-ccamp-loose-path-reopt-02.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4736.txt

This document defines a mechanism for the reoptimization of loosely
routed MPLS and GMPLS (Generalized Multiprotocol Label Switching)
Traffic Engineering (TE) Label Switched Paths (LSPs) signaled with
Resource Reservation Protocol Traffic Engineering (RSVP-TE).  This 
document proposes a mechanism that allows a TE LSP head-end Label 
Switching Router (LSR) to trigger a new path re-evaluation on every hop 
that has a next hop defined as a loose or abstract hop and a mid-point 
LSR to signal to the head-end LSR that a better path exists (compared to 
the current path) or that the TE LSP must be reoptimized (because of
maintenance required on the TE LSP path).  The proposed mechanism
applies to the cases of intra- and inter-domain (Interior Gateway
Protocol area (IGP area) or Autonomous System) packet and non-packet
TE LSPs following a loosely routed path.  This memo provides information 
for the Internet community.

This document is a product of the Common Control and Measurement Plane
Working Group of the IETF.


INFORMATIONAL: This memo provides information for the Internet community. 
It does not specify an Internet standard of any kind. Distribution
of this memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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