OSPF Flooding Reduction in MSDC
draft-xu-ospf-flooding-reduction-in-msdc-01

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Last updated 2017-05-04
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Network Working Group                                              X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                                 L. Fang
Expires: November 5, 2017                                           ebay
                                                             J. Tantsura
                                                              Individual
                                                             May 4, 2017

                    OSPF Flooding Reduction in MSDC
              draft-xu-ospf-flooding-reduction-in-msdc-01

Abstract

   OSPF is commonly used as an underlay routing protocol for MSDC
   (Massively Scalable Data Center) networks.  For a given OSPF router
   within the CLOS topology, it would receive multiple copies of exactly
   the same LSA from multiple OSPF neighbors.  In addition, two OSPF
   neighbors may send each other the same LSA simultaneously.  The
   unneccessary link-state information flooding wastes the precious
   process resource of OSPF routers greatly due to the fact that there
   are too many OSPF neighbors for each OSPF router within the CLOS
   topology.  This document proposes some extensions to OSPF so as to
   reduce the OSPF flooding within MSDC networks greatly.  The reduction
   of the OSPF flooding is much beneficial to improve the scalability of
   MSDC networks.  These modifications are applicable to both OSPFv2 and
   OSPFv3.

Status of This Memo

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   This Internet-Draft will expire on November 5, 2017.

Xu, et al.              Expires November 5, 2017                [Page 1]
Internet-Draft                                                  May 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Modifications to Current OSPF Behaviors . . . . . . . . . . .   4
     3.1.  OSPF Routers as Non-DRs . . . . . . . . . . . . . . . . .   4
     3.2.  Controllers as DR/BDR . . . . . . . . . . . . . . . . . .   5
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   OSPF is commonly used as an underlay routing protocol for Massively
   Scalable Data Center (MSDC) networks where CLOS is the most popular
   toplogy.  For a given OSPF router within the CLOS topology, it would
   receive multiple copies of exactly the same LSA from multiple OSPF
   neighbors.  In addition, two OSPF neighbors may send each other the
   same LSA simultaneously.  The unnecessary link-state information
   flooding wastes the precious process resource of OSPF routers greatly
   and therefore OSPF could not scale very well in MSDC networks.

   To simplify the network management task, centralized controllers are
   becoming fundamental network elements in most MSDCs.  One or more
   controllers are usually connected to all routers within the MSDC
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