IS-IS Routing for Spine-Leaf Topology
draft-shen-isis-spine-leaf-ext-04

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Networking Working Group                                         N. Shen
Internet-Draft                                               L. Ginsberg
Intended status: Standards Track                           Cisco Systems
Expires: January 1, 2018                                S. Thyamagundalu
                                                           June 30, 2017

                 IS-IS Routing for Spine-Leaf Topology
                   draft-shen-isis-spine-leaf-ext-04

Abstract

   This document describes a mechanism for routers and switches in a
   Spine-Leaf type topology to have non-reciprocal Intermediate System
   to Intermediate System (IS-IS) routing relationships between the
   leafs and spines.  The leaf nodes do not need to have the topology
   information of other nodes and exact prefixes in the network.  This
   extension also has application in the Internet of Things (IoT).

Status of This Memo

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   This Internet-Draft will expire on January 1, 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
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   include Simplified BSD License text as described in Section 4.e of

Shen, et al.             Expires January 1, 2018                [Page 1]
Internet-Draft             IS-IS SL Extension                  June 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Motivations . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Spine-Leaf (SL) Extension . . . . . . . . . . . . . . . . . .   4
     3.1.  Topology Examples . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Applicability Statement . . . . . . . . . . . . . . . . .   5
     3.3.  Extension Encoding  . . . . . . . . . . . . . . . . . . .   6
       3.3.1.  Spine-Leaf Sub-TLVs . . . . . . . . . . . . . . . . .   7
         3.3.1.1.  Leaf-Set Sub-TLV  . . . . . . . . . . . . . . . .   8
         3.3.1.2.  Info-Req Sub-TLV  . . . . . . . . . . . . . . . .   8
       3.3.2.  Advertising IPv4/IPv6 Reachability  . . . . . . . . .   8
     3.4.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . .   8
       3.4.1.  Pure CLOS Topology  . . . . . . . . . . . . . . . . .  10
     3.5.  Implementation and Operation  . . . . . . . . . . . . . .  11
       3.5.1.  CSNP PDU  . . . . . . . . . . . . . . . . . . . . . .  11
       3.5.2.  Leaf to Leaf connection . . . . . . . . . . . . . . .  11
       3.5.3.  Overload Bit  . . . . . . . . . . . . . . . . . . . .  11
       3.5.4.  Spine Node Hostname . . . . . . . . . . . . . . . . .  12
       3.5.5.  IS-IS Reverse Metric  . . . . . . . . . . . . . . . .  12
       3.5.6.  Spine-Leaf Traffic Engineering  . . . . . . . . . . .  12
       3.5.7.  Other End-to-End Services . . . . . . . . . . . . . .  12
       3.5.8.  Address Family and Topology . . . . . . . . . . . . .  13
       3.5.9.  Migration . . . . . . . . . . . . . . . . . . . . . .  13
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   7.  Document Change Log . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Changes to draft-shen-isis-spine-leaf-ext-04.txt  . . . .  14
     7.2.  Changes to draft-shen-isis-spine-leaf-ext-03.txt  . . . .  14
     7.3.  Changes to draft-shen-isis-spine-leaf-ext-02.txt  . . . .  14
     7.4.  Changes to draft-shen-isis-spine-leaf-ext-01.txt  . . . .  14
     7.5.  Changes to draft-shen-isis-spine-leaf-ext-00.txt  . . . .  15
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
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