PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) for P2MP LSPs
draft-dhody-pce-pcep-extension-pce-controller-p2mp-02
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2019-08-22
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PCE Working Group M. Negi
Internet-Draft Z. Li
Intended status: Standards Track X. Geng
Expires: February 23, 2020 Huawei Technologies
August 22, 2019
PCEP Procedures and Protocol Extensions for Using PCE as a Central
Controller (PCECC) for P2MP LSPs
draft-dhody-pce-pcep-extension-pce-controller-p2mp-02
Abstract
The Path Computation Element (PCE) is a core component of Software-
Defined Networking (SDN) systems. It can compute optimal paths for
traffic across a network and can also update the paths to reflect
changes in the network or traffic demands.
The PCE has been identified as an appropriate technology for the
determination of the paths of point- to-multipoint (P2MP) TE Label
Switched Paths (LSPs).
PCE was developed to derive paths for MPLS P2MP LSPs, which are
supplied to the head end (root) of the LSP using PCEP. PCEP has been
proposed as a control protocol to allow the PCE to be fully enabled
as a central controller.
A PCE-based central controller (PCECC) can simplify the processing of
a distributed control plane by blending it with elements of SDN and
without necessarily completely replacing it. Thus, the P2MP LSP can
be calculated/setup/initiated and the label forwarding entries can
also be downloaded through a centralized PCE server to each network
devices along the P2MP path while leveraging the existing PCE
technologies as much as possible.
This document specifies the procedures and PCEP protocol extensions
for using the PCE as the central controller for P2MP TE LSP.
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/.
Negi, et al. Expires February 23, 2020 [Page 1]
Internet-Draft PCECC August 2019
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 23, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Basic PCECC Mode . . . . . . . . . . . . . . . . . . . . . . 5
4. Procedures for Using the PCE as the Central Controller
(PCECC) for P2MP . . . . . . . . . . . . . . . . . . . . . . 5
4.1. Stateful PCE Model . . . . . . . . . . . . . . . . . . . 5
4.2. PCECC Capability Advertisement . . . . . . . . . . . . . 6
4.3. LSP Operations . . . . . . . . . . . . . . . . . . . . . 6
4.3.1. Basic PCECC LSP Setup . . . . . . . . . . . . . . . . 6
4.3.2. Central Control Instructions . . . . . . . . . . . . 7
4.3.2.1. Label Download . . . . . . . . . . . . . . . . . 7
4.3.2.2. Label Cleanup . . . . . . . . . . . . . . . . . . 8
4.3.3. PCE Initiated PCECC LSP . . . . . . . . . . . . . . . 9
4.3.4. PCECC LSP Update . . . . . . . . . . . . . . . . . . 9
4.3.5. Re Delegation and Cleanup . . . . . . . . . . . . . . 9
4.3.6. Synchronization of Central Controllers Instructions . 9
4.3.7. PCECC LSP State Report . . . . . . . . . . . . . . . 9
5. PCEP Objects . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. OPEN Object . . . . . . . . . . . . . . . . . . . . . . . 10
5.1.1. PCECC Capability sub-TLV . . . . . . . . . . . . . . 10
5.2. PATH-SETUP-TYPE TLV . . . . . . . . . . . . . . . . . . . 10
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