PCEP Extension for SR-MPLS Entropy Label Position
draft-peng-pce-entropy-label-position-04
PCE S. Peng
Internet-Draft Q. Xiong
Intended status: Standards Track ZTE Corporation
Expires: February 13, 2021 F. Qin
China Mobile
August 12, 2020
PCEP Extension for SR-MPLS Entropy Label Position
draft-peng-pce-entropy-label-position-04
Abstract
This document proposes a set of extensions for PCEP to configure the
entropy label position for SR-MPLS networks.
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Peng, et al. Expires February 13, 2021 [Page 1]
Internet-DrafPCEP Extension for SR-MPLS Entropy Label Positi August 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. Entropy Labels in SR-MPLS Scenario with PCE . . . . . . . . . 3
4. PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. The OPEN Object . . . . . . . . . . . . . . . . . . . . . 4
4.2. The LSP-EXTENDED-FLAG TLV . . . . . . . . . . . . . . . . 5
4.3. The ERO Object . . . . . . . . . . . . . . . . . . . . . 6
5. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8.1. New SR PCE Capability Flag Registry . . . . . . . . . . . 7
8.2. New LSP-EXTENDED-FLAG Flag Registry . . . . . . . . . . . 7
8.3. New SR-ERO Flag Registry . . . . . . . . . . . . . . . . 7
9. Normative References . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
[RFC5440] describes the Path Computation Element Protocol (PCEP)
which is used between a Path Computation Element (PCE) and a Path
Computation Client (PCC) (or other PCE) to enable computation of
Multi-protocol Label Switching (MPLS) for Traffic Engineering Label
Switched Path (TE LSP). PCEP Extensions for the Stateful PCE Model
[RFC8231] describes a set of extensions to PCEP to enable active
control of MPLS-TE and Generalized MPLS (GMPLS) tunnels. [RFC8281]
describes the setup and teardown of PCE-initiated LSPs under the
active stateful PCE model, without the need for local configuration
on the PCC, thus allowing for dynamic centralized control of a
network.
Segment Routing (SR) leverages the source routing paradigm. Segment
Routing can be instantiated on MPLS data plane which is referred to
as SR-MPLS [RFC8660]. SR-MPLS leverages the MPLS label stack to
construct the SR path. PCEP Extensions for Segment Routing [RFC8664]
specifies extensions to the PCEP that allow a stateful PCE to compute
and initiate TE paths, as well as a PCC to request a path subject to
certain constraint(s) and optimization criteria in SR networks.
Entropy label (EL) [RFC6790] is a technique used in the MPLS data
plane to improve load-balancing. Entropy Label Indicator (ELI) can
be immediately preceding an EL in the MPLS label stack. The idea
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