SR Path Ingress Protection
draft-chen-idr-sr-ingress-protection-00
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2019-07-06
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Network Working Group H. Chen
Internet-Draft Futurewei
Intended status: Standards Track M. Toy
Expires: January 7, 2020 Verizon
A. Wang
China Telecom
Z. Li
China Mobile
L. Liu
Fujitsu
X. Liu
Volta Networks
July 6, 2019
SR Path Ingress Protection
draft-chen-idr-sr-ingress-protection-00
Abstract
This document describes protocol extensions and procedures for
protecting the ingress node of a Segment Routing (SR) 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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 7, 2020.
Chen, et al. Expires January 7, 2020 [Page 1]
Internet-Draft SR Ingress Protection July 2019
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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described in the Simplified BSD License.
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 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
6. Backup Ingress Behavior . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
9.1. BGP Tunnel Encapsulation Attribute Sub-TLVs . . . . . . . 10
9.2. Ingress Protection Information Sub-TLVs . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . 10
10.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
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]. However, these
documents do not discuss the procedures for fast protection of the
ingress node of an SR path or tunnel.
This document fills that void and specifies protocol extensions and
procedures for fast protection of the ingress node of an SR path. SR
path and SR tunnel, Ingress node and ingress as well as fast
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