Applicability of a Stateful Path Computation Element (PCE) (RFC8051)
Original Publication Date: 2017-Jan-01
Included in the Prior Art Database: 2017-Jan-07
Internet Society Requests For Comment (RFCs)
X. Zhang: AUTHOR [+4]
[RFC4655] defines the architecture for a model based on the Path Computation Element (PCE) for the computation of Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering Label Switched Paths (TE LSPs). To perform such a constrained computation, a PCE stores the network topology (i.e., TE links and nodes) and resource information (i.e., TE attributes) in its TE Database (TED). [RFC5440] describes the Path Computation Element Protocol (PCEP) for interaction between a Path Computation Client (PCC) and a PCE, or between two PCEs, enabling computation of TE LSPs.
Internet Engineering Task Force (IETF) X. Zhang, Ed. Request for Comments: 8051 Huawei Technologies Category: Informational I. Minei, Ed. ISSN: 2070-1721 Google, Inc. January 2017
Applicability of a Stateful Path Computation Element (PCE)
A stateful Path Computation Element (PCE) maintains information about Label Switched Path (LSP) characteristics and resource usage within a network in order to provide traffic-engineering calculations for its associated Path Computation Clients (PCCs). This document describes general considerations for a stateful PCE deployment and examines its applicability and benefits, as well as its challenges and limitations, through a number of use cases. PCE Communication Protocol (PCEP) extensions required for stateful PCE usage are covered in separate documents.
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 7841.
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/rfc8051.
Minei Informational [Page 1]
RFC 8051 Applicability for a Stateful PCE January 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3