OSPF Graceful Restart Enhancements
draft-basavaraj-ospf-graceful-restart-enhancements-01
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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.
Status of this Memo
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Copyright and License Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
Basavaraj Expires January 8, 2020 [Page 1]
INTERNET DRAFT OSPF Graceful Restart Enhancements July 7, 2019
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(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
Basavaraj Expires January 8, 2020 [Page 2]
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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