The Use Cases for Path Computation Element (PCE) as a Central Controller (PCECC).
TEAS Working Group Q. Zhao
Internet-Draft Z. Li
Intended status: Informational B. Khasanov
Expires: September 9, 2020 D. Dhody
Tencent Holdings Ltd.
Mobile TeleSystems JLLC
March 8, 2020
The Use Cases for Path Computation Element (PCE) as a Central Controller
The Path Computation Element (PCE) is a core component of a Software-
Defined Networking (SDN) system. 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. PCE was developed to
derive paths for MPLS Label Switched Paths (LSPs), which are supplied
to the head end of the LSP using the Path Computation Element
Communication Protocol (PCEP).
SDN has a broader applicability than signaled MPLS traffic-engineered
(TE) networks, and the PCE may be used to determine paths in a range
of use cases including static LSPs, segment routing (SR), Service
Function Chaining (SFC), and most forms of a routed or switched
network. It is, therefore, reasonable to consider PCEP as a control
protocol for use in these environments to allow the PCE to be fully
enabled as a central controller.
This document describes general considerations for PCECC deployment
and examines its applicability and benefits, as well as its
challenges and limitations, through a number of use cases. PCEP
extensions required for stateful PCE usage are covered in separate
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This is a living document to catalogue the use cases for PCECC.
There is currently no intention to publish this work as an RFC.
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
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This Internet-Draft will expire on September 9, 2020.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
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