LSA Flushing Problem Mitigation in OSPF Networks
draft-dong-ospf-flush-mitigation-00

Document Type Active Internet-Draft (individual)
Last updated 2016-10-31
Stream (None)
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                            J. Dong
Internet-Draft                                                  X. Zhang
Intended status: Standards Track                     Huawei Technologies
Expires: May 4, 2017                                               Z. Li
                                                            China Mobile
                                                        October 31, 2016

            LSA Flushing Problem Mitigation in OSPF Networks
                  draft-dong-ospf-flush-mitigation-00

Abstract

   In OSPF protocol, LSAs with the LS age at MaxAge are not used in
   routing table calculation and MUST be flushed in the network.  In
   some cases, the flushing of OSPF MaxAge LSAs may cause flooding storm
   of OSPF packets and severely impact network stability and the
   services provided by the network.  This document specifies a backward
   compatible mechanism to mitigate the impact of MaxAge LSA flushing in
   OSPF networks.

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 RFC 2119 [RFC2119].

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 4, 2017.

Dong, et al.               Expires May 4, 2017                  [Page 1]
Internet-Draft        OSPF LSA Flushing Mitigation          October 2016

Copyright Notice

   Copyright (c) 2016 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Proposed Solution . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Deployment Considerations . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   In OSPF protocol [RFC2328], Link State Updates (LSAs) are exchanged
   in Link State Update (LSU) packets to achieve link-state database
   (LSDB) synchronization and consistent route calculation.  LSAs with
   the LS age at MaxAge are not used in routing table calculation and
   MUST be flushed in the network.  In some cases, the flushing of
   MaxAge LSAs can cause flooding storm of OSPF packets and severely
   impact network stability and the services provided by the network.
   [I-D.dong-ospf-maxage-flush-problem-statement] analyzes the problem
   of MaxAge LSA flushing, and gives the requirements on potential
   solutions.

   This document proposes a backward compatible mechanism to mitigate
   the impacts of MaxAge LSA flushing in OSPF networks.

Dong, et al.               Expires May 4, 2017                  [Page 2]
Internet-Draft        OSPF LSA Flushing Mitigation          October 2016

2.  Proposed Solution

   In normal cases, the flushing of router-LSA indicates that the
   originator of the LSA is no longer reachable in the network and is
Show full document text