SR Path Ingress Protection
draft-chen-idr-sr-ingress-protection-03
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-idr-sr-ingress-protection-03
Abstract
This document describes extensions to Border Gateway Protocol (BGP)
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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provisions of BCP 78 and BCP 79.
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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 . . . . . . . . . . . . . 4
4. Behavior after Ingress Failure . . . . . . . . . . . . . . . 4
5. Extensions to BGP . . . . . . . . . . . . . . . . . . . . . . 5
5.1. SR Path Ingress Protection Sub-TLV . . . . . . . . . . . 5
5.1.1. Primary Ingress Sub-TLV . . . . . . . . . . . . . . . 6
5.1.2. Service Sub-TLV . . . . . . . . . . . . . . . . . . . 7
5.1.3. Traffic Description Sub-TLVs . . . . . . . . . . . . 8
6. Backup Ingress Behavior . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9.1. BGP Tunnel Encapsulation Attribute Sub-TLVs . . . . . . . 12
9.2. Ingress Protection Information Sub-TLVs . . . . . . . . . 13
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
10.1. Normative References . . . . . . . . . . . . . . . . . . 13
10.2. Informative References . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
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.
Chen, et al. Expires May 4, 2021 [Page 2]
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