Anycast-SID FRR in SR
draft-chen-spring-anycast-sid-frr-00

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Last updated 2018-08-28
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Networking Working Group                                       Ran. Chen
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                                Jie. Han
Expires: March 1, 2019                                   ZTE Corporation
                                                         August 28, 2018

                         Anycast-SID FRR in SR
                  draft-chen-spring-anycast-sid-frr-00

Abstract

   This document specifies the fast redundancy protection mechanism,
   aimed at providing protection of the links and domain boundary nodes
   for network that use segment routing.

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
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   This Internet-Draft will expire on March 1, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   2
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Anycast-SID FRR Solution  . . . . . . . . . . . . . . . . . .   2
     4.1.  Domain boundary nodes protection  . . . . . . . . . . . .   2
     4.2.  Links and nodes protection in Inter-Area scenario . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative references  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   This document extends the use of Anycast-SID FRR to provide links and
   domain boundary nodes that use segment routing.

2.  Conventions used in this document

   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.

3.  Motivation

   The procedures specified in this document, in combination with
   [I-D.ietf-spring-segment-routing] provide the fast redundancy
   protection.

   The procedures specified in this document aims at providing
   protection of the links and domain boundary nodes for network that
   use segment routing

4.  Anycast-SID FRR Solution

4.1.  Domain boundary nodes protection

   The solution consists of three parts.

   o  Configure the same anycast prefix and associated prefix-sid for
      each domain boundary node that forms redundant protection, then
      the anycast prefix and associated prefix-sid with Anycast-Group
      flag should be advertised to the neighbor node.

   o  Create the anycast-group forwarding entry (i.e.  FRR entry) after
      the direct neighbor node of the domain boundary nodes receive the
      prefix-sid with Anycast-Group flag advertisement.  The anycast-

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      group forwarding entry includes the forwarding information which
      points to each of the domain boundary node , then the forwarding
      entry pointing to the main domain boundary (one of the direct
      connected boundary nodes from the PLR) is set to the active state,
      and others are set to the backup state.  Only the direct neighbor
      of the domain boundary nodes need to set up the anycast-group
      forwarding entry.

   o  if the neighbor node detects the main domain boundary node
      failure, the neighbor node immediately activates the backup entry.
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