Segment Routing PCE Delegation in BGP
draft-wang-idr-sr-policy-pce-delegation-00
Inter-Domain Routing Working Group Y. Wang
Internet-Draft H. Li
Intended status: Standards Track Y. Qiu
Expires: August 2, 2021 L. Yang
M. Chen
H3C Technologies
February 2, 2021
Segment Routing PCE Delegation in BGP
draft-wang-idr-sr-policy-pce-delegation-00
Abstract
Segment Routing is a source routing paradigm that explicitly
indicates the forwarding path for packets at the ingress node. An
SR policy is a set of candidate SR paths consisting of one or more
segment lists with necessary path attributes. The headend of an SR
Policy may learn multiple candidate paths for an SR Policy.
Candidate paths may be learned via a number of different mechanisms,
e.g., CLI, NetConf, PCEP, or BGP.
The Path Computation Element (PCE) provides path computation
functions in support of traffic engineering in Multi Protocol Label
Switching (MPLS) and Generalized MPLS (GMPLS) networks.
Currently, when a controller uses BGP to deploy an SR Policy, there
is no way to encode PCE delegation related options. The only way to
import a PCE delegation is through local configuration management,
e.g., Netconf, CLI or gRPC.
This document defines extensions to BGP to distribute PCE
delegation information within an SR policy.
Status of This Memo
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This Internet-Draft will expire on August 2, 2021.
Wang, et al. Expires August 2, 2021 [Page 1]
Internet-Draft SR Path PCE Delegation in BGP February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
3. SR Policy for PCE Delegation. . . . . . . . . . . . . . . . . 4
3.1. PCE Delegation Sub-TLV . . . . . . . . . . . . . . . . . 6
4. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.1. Normative References . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
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1. Introduction
Segment routing (SR) [RFC8402] is a source routing paradigm that
explicitly indicates the forwarding path for packets at the
ingress node. The ingress node steers packets into a specific
path according to the Segment Routing Policy (SR Policy) as
defined in[I-D.ietf-spring-segment-routing-policy]. In order
to distribute SR policies to the headend,
[I-D.ietf-idr-segment-routing-te-policy] specifies a mechanism by
using BGP.
[RFC5440] describes the Path Computation Element (PCE) Communication
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