SR Path Ingress Protection
draft-chen-pce-sr-ingress-protection-04
Network Working Group H. Chen
Internet-Draft Futurewei
Intended status: Standards Track M. Toy
Expires: May 4, 2021 Verizon
A. Wang
China Telecom
Z. Li
China Mobile
L. Liu
Fujitsu
X. Liu
Volta Networks
October 31, 2020
SR Path Ingress Protection
draft-chen-pce-sr-ingress-protection-04
Abstract
This document describes extensions to Path Computation Element (PCE)
communication Protocol (PCEP) for protecting the ingress node of a
Segment Routing (SR) tunnel or path.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of This Memo
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This Internet-Draft will expire on May 4, 2021.
Chen, et al. Expires May 4, 2021 [Page 1]
Internet-Draft SR Ingress Protection October 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 3
3. SR Path Ingress Protection Example . . . . . . . . . . . . . 3
4. Behavior after Ingress Failure . . . . . . . . . . . . . . . 4
5. Extensions to PCEP . . . . . . . . . . . . . . . . . . . . . 5
5.1. Capability for SR Path Ingress Protection . . . . . . . . 5
5.2. SR Path Ingress Protection . . . . . . . . . . . . . . . 6
5.2.1. Traffic-Description sub-TLV . . . . . . . . . . . . . 7
5.2.2. Primary-Ingress sub-TLV . . . . . . . . . . . . . . . 10
5.2.3. Service sub-TLV . . . . . . . . . . . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
The fast protection of a transit node of a Segment Routing (SR) path
or tunnel is described in [I-D.bashandy-rtgwg-segment-routing-ti-lfa]
and [I-D.hu-spring-segment-routing-proxy-forwarding]. [RFC8424]
presents extensions to RSVP-TE for the fast protection of the ingress
node of a traffic engineering (TE) Label Switching Path (LSP).
However, these documents do not discuss any protocol extensions for
the fast protection of the ingress node of an SR path or tunnel.
This document fills that void and specifies protocol extensions to
Path Computation Element (PCE) communication Protocol (PCEP) for the
fast protection of the ingress node of an SR path or tunnel. Ingress
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