Requirements for GMPLS Applications of PCE
RFC 7025
Internet Engineering Task Force (IETF) T. Otani
Request for Comments: 7025 K. Ogaki
Category: Informational KDDI
ISSN: 2070-1721 D. Caviglia
Ericsson
F. Zhang
Huawei Technologies
C. Margaria
Coriant R&D GmbH
September 2013
Requirements for GMPLS Applications of PCE
Abstract
The initial effort of the PCE (Path Computation Element) WG focused
mainly on MPLS. As a next step, this document describes functional
requirements for GMPLS applications of PCE.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7025.
Otani, et al. Informational [Page 1]
RFC 7025 Reqs for GMPLS Apps of PCE September 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. GMPLS Applications of PCE . . . . . . . . . . . . . . . . . . 3
2.1. Path Computation in GMPLS Networks . . . . . . . . . . . . 3
2.2. Unnumbered Interface . . . . . . . . . . . . . . . . . . . 5
2.3. Asymmetric Bandwidth Path Computation . . . . . . . . . . 5
3. Requirements for GMPLS Applications of PCE . . . . . . . . . . 6
3.1. Requirements on Path Computation Request . . . . . . . . . 6
3.2. Requirements on Path Computation Reply . . . . . . . . . . 7
3.3. GMPLS PCE Management . . . . . . . . . . . . . . . . . . . 8
4. Security Considerations . . . . . . . . . . . . . . . . . . . 8
5. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1. Normative References . . . . . . . . . . . . . . . . . . . 9
6.2. Informative References . . . . . . . . . . . . . . . . . . 11
1. Introduction
The initial effort of the PCE (Path Computation Element) WG focused
mainly on solving the path computation problem within a domain or
over different domains in MPLS networks. As with MPLS, service
providers (SPs) have also come up with requirements for path
computation in GMPLS-controlled networks [RFC3945], such as those
based on Wavelength Division Multiplexing (WDM), Time Division
Multiplexing (TDM), or Ethernet.
[RFC4655] and [RFC4657] discuss the framework and requirements for
PCE on both packet MPLS networks and GMPLS-controlled networks. This
document complements those RFCs by providing considerations of GMPLS
applications in the intradomain and interdomain networking
environments and indicating a set of requirements for the extended
definition of PCE-related protocols.
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Note that the requirements for interlayer and inter-area traffic
engineering (TE) described in [RFC6457] and [RFC4927] are outside of
the scope of this document.
Constrained Shortest Path First (CSPF) computation within a domain or
over domains for signaling GMPLS Label Switched Paths (LSPs) is
usually more stringent than that of MPLS TE LSPs [RFC4216], because
the additional constraints, e.g., interface switching capability,
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