BCP 87, RFC 3785 on Use of Interior Gateway Protocol (IGP) Metric as a second MPLS Traffic Engineering (TE) Metric

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        BCP 87
        RFC 3785

        Title:      Use of Interior Gateway Protocol (IGP) Metric
                    as a second MPLS Traffic Engineering (TE) Metric
        Author(s):  F. Le Faucheur, R. Uppili, A. Vedrenne, P. Merckx,
                    T. Telkamp
        Status:     Best Current Practice
        Date:       May 2004
        Mailbox:    [e-mail], [e-mail],
                    [e-mail],
                    [e-mail], [e-mail]
        Pages:      8
        Characters: 17475
        SeeAlso:    BCP 87

        I-D Tag:    draft-ietf-tewg-te-metric-igp-02.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3785.txt


This document describes a common practice on how the existing metric
of Interior Gateway Protocols (IGP) can be used as an alternative
metric to the Traffic Engineering (TE) metric for Constraint Based
Routing of MultiProtocol Label Switching (MPLS) Traffic Engineering
tunnels.  This effectively results in the ability to perform
Constraint Based Routing with optimization of one metric (e.g., link
bandwidth) for some Traffic Engineering tunnels (e.g., Data Trunks)
while optimizing another metric (e.g., propagation delay) for some
other tunnels with different requirements (e.g., Voice Trunks).  No
protocol extensions or modifications are required.  This text
documents current router implementations and deployment practices.

This document is a product of the Internet Traffic Engineering Working
Group of the IETF.

This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements.  Distribution of this memo is unlimited.

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

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