OSPF Graceful Restart Enhancements
draft-basavaraj-ospf-graceful-restart-enhancements-01

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Last updated 2019-07-08
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INTERNET-DRAFT                                     Vijayalaxmi Basavaraj
Intended Status: Informational                               Ankur Dubey
Updates: 3623, 5187                                         Sami Boutros
                                                                  VMware

                                                             Acee Lindem
                                                                   Cisco
Expires: January 8, 2020                                    July 7, 2019

                   OSPF Graceful Restart Enhancements
         draft-basavaraj-ospf-graceful-restart-enhancements-01

Abstract

   This document describes enhancements to the OSPF graceful restart
   procedures to improve routing convergence in some OSPF network
   deployments. This document updates RFC 3623 and RFC 5187.

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   provisions of BCP 78 and BCP 79.

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Copyright and License Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors. All rights reserved.

 

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INTERNET DRAFT     OSPF Graceful Restart Enhancements       July 7, 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  Graceful Restart Enhancements . . . . . . . . . . . . . . . . .  3
     2.1 Stub Link Network Scenarios  . . . . . . . . . . . . . . . .  3
     2.2 Multiple Failure Scenarios . . . . . . . . . . . . . . . . .  4
   3  Security Considerations . . . . . . . . . . . . . . . . . . . .  4
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  4
   5.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     5.1  Normative References  . . . . . . . . . . . . . . . . . . .  4
     5.2  Informative References  . . . . . . . . . . . . . . . . . .  4
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  5

 

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INTERNET DRAFT     OSPF Graceful Restart Enhancements       July 7, 2019

1  Introduction

   This document describes the enhancements to the current Graceful
   restart OSPF procedure to improve routing convergence in certain OSPF
   network deployment scenarios. The goal is for both the restarting
   OSPF node and the helper OSPF node to terminate the OSPF graceful
   restart procedure faster and not wait for the grace period expiry in
   those network scenarios and hence improve the overall OSPF network
   convergence.

1.1  Terminology

   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].

2  Graceful Restart Enhancements

   In this section we will describe couple of issues with OSPF Graceful
   Restart (GR) in some network deployment scenarios, and a proposal to
   enhance the OSPF GR procedure to achieve faster OSPF routing
   convergence in those scenarios.

2.1 Stub Link Network Scenarios

   ---------             ---------            ---------
   |Router1|---Area 0----|Router2|---Area 1---|Router3|
   ---------             ---------            ---------

           Figure1: OSPF topology with Graceful restart

   As described in figure 1, Router2 is an area border router (ABR) with
   OSPF links in 2 areas. Furthermore. Router2 has formed full
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