OSPF Graceful Restart Enhancements
draft-basavaraj-lsr-ospf-gr-enhancements-00

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LSR Working Group                                             S. Boutros
Internet-Draft                                                  A. Dubey
Intended status: Standards Track                            V. Basavaraj
Expires: July 10, 2020                                            VMware
                                                               A. Lindem
                                                           Cisco Systems
                                                         January 7, 2020

                   OSPF Graceful Restart Enhancements
              draft-basavaraj-lsr-ospf-gr-enhancements-00

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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   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 10, 2020.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   2
   3.  Graceful Restart Enhancements . . . . . . . . . . . . . . . .   2
     3.1.  Stub-Link Network Scenarios . . . . . . . . . . . . . . .   2
     3.2.  Multiple Failure Scenarios  . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   This document describes the enhancements to the current OSPF
   [RFC2328] and OSPFv3 [RFC5340] graceful restart procedures as
   respectively defined in OSPF Graceful Restart [RFC3623] and OSPFv3
   Graceful Restart [RFC5187] 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.

2.  Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Graceful Restart Enhancements

3.1.  Stub-Link Network Scenarios

          +--------+             +--------+            +--------+
          |Router-1|---Area 0----|Router-2|---Area 1---|Router-3|
          +------=-+             +--------+            +--------+

                  Figure 1: OSPF topology with Graceful Restart

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   As graphically depicted in figure 1, Router-2 is an area border
   router (ABR) with OSPF links in 2 areas.  Furthermore, Router-2 has
   formed full adjacencies only in Area 0.  In Area 1, Router-2 has an
   OSPF link enabled but Router2 could not form an adjacency either
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