IS-IS Flooding Reduction in MSDC
draft-xu-isis-flooding-reduction-in-msdc-01

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Last updated 2017-05-03
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Network Working Group                                              X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                            E. Auerswald
Expires: November 3, 2017                                       fgn GmbH
                                                                 L. Fang
                                                                    ebay
                                                             J. Tantsura
                                                              Individual
                                                             May 2, 2017

                    IS-IS Flooding Reduction in MSDC
              draft-xu-isis-flooding-reduction-in-msdc-01

Abstract

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

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on November 3, 2017.

Xu, et al.              Expires November 3, 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.

   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
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Table of Contents

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

1.  Introduction

   IS-IS 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 IS-IS router within the CLOS topology, it would
   receive multiple copies of exactly the same LSP from multiple IS-IS
   neighbors.  In addition, two IS-IS neighbors may send each other the
   same LSP simultaneously.  The unnecessary link-state information
   flooding wastes the precious process resource of IS-IS routers
   greatly and therefore IS-IS 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
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