[Pce] RFC 6457 on PCC-PCE Communication and PCE Discovery Requirements for Inter-Layer Traffic Engineering

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        RFC 6457

        Title:      PCC-PCE Communication and PCE Discovery 
                    Requirements for Inter-Layer Traffic Engineering 
        Author:     T. Takeda, Ed.,
                    A. Farrel
        Status:     Informational
        Stream:     IETF
        Date:       December 2011
        Mailbox:    takeda.tomonori@lab.ntt.co.jp, 
                    adrian@olddog.co.uk
        Pages:      12
        Characters: 29107
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pce-inter-layer-req-15.txt

        URL:        http://www.rfc-editor.org/rfc/rfc6457.txt

The Path Computation Element (PCE) provides functions of path
computation in support of traffic engineering in networks controlled by
Multi-Protocol Label Switching (MPLS) and Generalized MPLS (GMPLS).

MPLS and GMPLS networks may be constructed from layered client/server
networks.  It is advantageous for overall network efficiency to
provide end-to-end traffic engineering across multiple network
layers.  PCE is a candidate solution for such requirements.

Generic requirements for a communication protocol between Path
Computation Clients (PCCs) and PCEs are presented in RFC 4657, "Path
Computation Element (PCE) Communication Protocol Generic
Requirements".  Generic requirements for a PCE discovery protocol are
presented in RFC 4674, "Requirements for Path Computation Element
(PCE) Discovery".

This document complements the generic requirements and presents
detailed sets of PCC-PCE communication protocol requirements and PCE
discovery protocol requirements for inter-layer traffic engineering.
This document is not an Internet Standards Track specification; it is
published for informational purposes.

This document is a product of the Path Computation Element Working Group of the IETF.

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