Redundancy SID and Merging SID for Redundancy Protection
draft-geng-spring-redundancy-protection-sid-00

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Network Working Group                                            X. Geng
Internet-Draft                                                   M. Chen
Intended status: Experimental                                     Huawei
Expires: September 10, 2020                               March 09, 2020

        Redundancy SID and Merging SID for Redundancy Protection
             draft-geng-spring-redundancy-protection-sid-00

Abstract

   Redundancy protection is a method of service protection by sending
   copies of the same packets of one flow over multiple paths, which
   includes packet replication, elimination and ordering.  This document
   defines Redundancy SID and Merging SID to support redundancy
   protection.

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 .

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 10, 2020.

Copyright Notice

   Copyright (c) 2020 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

Geng & Chen            Expires September 10, 2020               [Page 1]
Internet-Draft              Abbreviated-Title                 March 2020

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Conventions . . . . . . . . . . . . . . . . .   2
   3.  Redundancy Protection Introduction  . . . . . . . . . . . . .   3
   4.  Redundancy SID  . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Merging SID . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   Redundancy protection is a method of providing 1+1 protection by
   sending copies of the same packets of one flow over multiple paths,
   which includes packet replication, elimination and ordering.  This
   document defines Redundancy SID and Merging SID to support redundancy
   protection.

2.  Terminology and Conventions

   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 [RFC2119].

   Redundancy Node: the start point of redundancy protection, which is a
   network device that could implement packet replication.

   Merging Node: the end point of redundancy protection, which is a
   network node that could implement packet elimination and ordering
   (optionally).

   Editor's Note: Similar mechanism is defined as "Service Protection"
   in the [RFC8655].  In this document, we define a new term "Redundancy
   Protection" to distinguish with other service protection method.
   Some of the terms are the similar as [RFC8655].

Geng & Chen            Expires September 10, 2020               [Page 2]
Internet-Draft              Abbreviated-Title                 March 2020

3.  Redundancy Protection Introduction

   The figure shows how to provide redundancy protection in an Segment
   Routing Domain.

                |                                         |
                |<---------------SR Domain--------------->|
                |                                         |
                |             +------+T2+----+            |
      +---+    +---+        +-+-+          +-+-+        +---+    +---+
      | E1+----| In|--+T1+--+Red|          |Mer|--+T4+--| Eg+----+ E2|
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