Support for Path MTU (PMTU) in the Path Computation Element (PCE) communication Protocol (PCEP).
draft-li-pce-pcep-pmtu-01
PCE Working Group S. Peng
Internet-Draft C. Li
Intended status: Standards Track Huawei Technologies
Expires: January 6, 2021 L. Han
China Mobile
July 5, 2020
Support for Path MTU (PMTU) in the Path Computation Element (PCE)
communication Protocol (PCEP).
draft-li-pce-pcep-pmtu-01
Abstract
The Path Computation Element (PCE) provides path computation
functions in support of traffic engineering in Multiprotocol Label
Switching (MPLS) and Generalized MPLS (GMPLS) networks.
The Source Packet Routing in Networking (SPRING) architecture
describes how Segment Routing (SR) can be used to steer packets
through an IPv6 or MPLS network using the source routing paradigm. A
Segment Routed Path can be derived from a variety of mechanisms,
including an IGP Shortest Path Tree (SPT), explicit configuration, or
a Path Computation Element (PCE).
Since the SR does not require signaling, the path maximum
transmission unit (MTU) information for SR path is not available.
This document specify the extension to PCE communication protocol
(PCEP) to carry path (MTU) in the PCEP messages.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Peng, et al. Expires January 6, 2021 [Page 1]
Internet-Draft PCEP-PMTU July 2020
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This Internet-Draft will expire on January 6, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. PCEP Extention . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Extensions to METRIC Object . . . . . . . . . . . . . . . 4
2.2. Stateful PCE and PCE Initiated LSPs . . . . . . . . . . . 5
2.3. Segement Routing . . . . . . . . . . . . . . . . . . . . 5
3. Security Considerations . . . . . . . . . . . . . . . . . . . 6
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
4.1. METRIC Types . . . . . . . . . . . . . . . . . . . . . . 6
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Normative References . . . . . . . . . . . . . . . . . . 6
6.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
[RFC5440] describes the Path Computation Element (PCE) Communication
Protocol (PCEP). PCEP enables the communication between a Path
Computation Client (PCC) and a PCE, or between PCE and PCE, for the
purpose of computation of Multiprotocol Label Switching (MPLS) as
well as Generalzied MPLS (GMPLS) Traffic Engineering Label Switched
Path (TE LSP) characteristics.
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[RFC8231] specifies a set of extensions to PCEP to enable stateful
control of TE LSPs within and across PCEP sessions in compliance with
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