IS-IS Support for Openfabric
draft-white-openfabric-04

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Last updated 2017-10-12
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Network Working Group                                      R. White, Ed.
Internet-Draft                                             S. Zandi, Ed.
Intended status: Informational                                  LinkedIn
Expires: April 15, 2018                                 October 12, 2017

                      IS-IS Support for Openfabric
                       draft-white-openfabric-04

Abstract

   Spine and leaf topologies are widely used in hyperscale and cloud
   scale networks.  In most of these networks, configuration is
   automated, but difficult, and topology information is extracted
   through broad based connections.  Policy is often integrated into the
   control plane, as well, making configuration, management, and
   troubleshooting difficult.  Openfabric is an adaptation of an
   existing, widely deployed link state protocol, Intermediate System to
   Intermediate System (IS-IS) that is designed to:

   o  Provide a full view of the topology from a single point in the
      network to simplify operations

   o  Minimize configuration of each Intermediate System (IS) (also
      called a router or switch) in the network

   o  Optimize the operation of IS-IS within a spine and leaf fabric to
      enable scaling

   This document begins with an overview of openfabric, including a
   description of what may be removed from IS-IS to enable scaling.  The
   document then describes an optimized adjacency formation process; an
   optimized flooding scheme; some thoughts on the operation of
   openfabric, metrics, and aggregation; and finally a description of
   the changes to the IS-IS protocol required for openfabric.

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 https://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

White & Zandi            Expires April 15, 2018                 [Page 1]
Internet-Draft        IS-IS Support for Openfabric          October 2017

   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 April 15, 2018.

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
   (https://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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Goals . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Contributors  . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Simplification  . . . . . . . . . . . . . . . . . . . . .   3
     1.4.  Additions and Requirements  . . . . . . . . . . . . . . .   4
     1.5.  Sample Network  . . . . . . . . . . . . . . . . . . . . .   4
   2.  Modified Adjacency Formation  . . . . . . . . . . . . . . . .   6
     2.1.  Level 2 Adjacencies Only  . . . . . . . . . . . . . . . .   6
     2.2.  Point-to-point Adjacencies  . . . . . . . . . . . . . . .   6
     2.3.  Three Way Handshake Support . . . . . . . . . . . . . . .   7
     2.4.  Adjacency Formation Optimization  . . . . . . . . . . . .   7
   3.  Advertisement of Reachability Information . . . . . . . . . .   7
   4.  Determining and Advertising Location on the Fabric  . . . . .   8
     4.1.  Calcuating Tier Number with a Fixed T0  . . . . . . . . .   9
     4.2.  Calculating the Tier Number in a Five Stage Spine and
           Leaf  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Flooding Optimization . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Flooding Failures . . . . . . . . . . . . . . . . . . . .  13
   6.  Other Optimizations . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Transit Link Reachability . . . . . . . . . . . . . . . .  13
     6.2.  Transiting T0 Intermediate Systems  . . . . . . . . . . .  13
   7.  Openfabric and Route Aggregation  . . . . . . . . . . . . . .  14
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