PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) for P2MP LSPs
draft-dhody-pce-pcep-extension-pce-controller-p2mp-05
PCE Working Group Z. Li
Internet-Draft S. Peng
Intended status: Standards Track X. Geng
Expires: May 5, 2021 Huawei Technologies
M. Negi
RtBrick Inc
November 1, 2020
PCEP Procedures and Protocol Extensions for Using PCE as a Central
Controller (PCECC) for P2MP LSPs
draft-dhody-pce-pcep-extension-pce-controller-p2mp-05
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/set up/initiated and the label forwarding entries can
also be downloaded through a centralized PCE server to each network
device along the P2MP path, while leveraging the existing PCE
technologies as much as possible.
This document specifies the procedures and PCEP 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
Li, et al. Expires May 5, 2021 [Page 1]
Internet-Draft PCECC November 2020
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 5, 2021.
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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 a Central Controller (PCECC)
for P2MP . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Stateful PCE Model . . . . . . . . . . . . . . . . . . . 6
4.2. PCECC Capability Advertisement . . . . . . . . . . . . . 6
4.3. LSP Operations . . . . . . . . . . . . . . . . . . . . . 6
4.3.1. PCE-Initiated PCECC LSP . . . . . . . . . . . . . . . 7
4.3.2. PCC-Initiated PCECC LSP . . . . . . . . . . . . . . . 7
4.3.3. Central Control Instructions . . . . . . . . . . . . 8
4.3.3.1. Label Download CCI . . . . . . . . . . . . . . . 8
4.3.3.2. Label Clean up CCI . . . . . . . . . . . . . . . 9
4.3.4. PCECC LSP Update . . . . . . . . . . . . . . . . . . 10
4.3.5. Re-Delegation and Clean up . . . . . . . . . . . . . 10
4.3.6. Synchronization of Central Controllers Instructions . 10
4.3.7. PCECC LSP State Report . . . . . . . . . . . . . . . 10
4.3.8. PCC-Based Allocations . . . . . . . . . . . . . . . . 10
5. PCEP Messages . . . . . . . . . . . . . . . . . . . . . . . . 10
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