IS-IS Multi Topology Deployment Considerations
draft-chunduri-lsr-isis-mt-deployment-cons-02

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LSR Working Group                                            U. Chunduri
Internet-Draft                                                Huawei USA
Intended status: Informational                               J. Tantsura
Expires: November 20, 2019                                  Apstra, Inc.
                                                                S. Hegde
                                                        Juniper Networks
                                                            May 19, 2019

             IS-IS Multi Topology Deployment Considerations
             draft-chunduri-lsr-isis-mt-deployment-cons-02

Abstract

   This document analyzes IS-IS Multi Topology (MT) applicability in
   various deployments (Core/Mobile Backhaul/Data Center underlays).
   This document explores the nuances around the terminology and usage
   of various IS-IS address families, topologies with different
   considerations, for choosing the right combination for a specific
   deployment scenario.

   This document also discusses various ways one can deploy IPv6 only
   IS-IS topology.

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 RFC2119 [RFC2119],
   RFC8174 [RFC8174] when, and only when they appear in all capitals, as
   shown here.

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
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   This Internet-Draft will expire on November 20, 2019.

Chunduri, et al.        Expires November 20, 2019               [Page 1]
Internet-DrafIS-IS Multi Topology Deployment Considerations     May 2019

Copyright Notice

   Copyright (c) 2019 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Need for MT in IS-IS networks . . . . . . . . . . . . . . . .   3
   3.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Topologies and Address Families . . . . . . . . . . . . . . .   4
     4.1.  Single Topology Mode and Multiple Address Families  . . .   4
     4.2.  Multiple Topology Mode  and Multiple Address Families . .   5
       4.2.1.  Transition Mode . . . . . . . . . . . . . . . . . . .   6
     4.3.  IPv6 Only Topology  . . . . . . . . . . . . . . . . . . .   6
   5.  IS-IS MT and LFA  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   ISIS originally developed for OSI [ISO.10589.1992] and extensions
   have been made available to support IPv4 [RFC1195].  A method for
   exchanging IPv6 routing information using the IS-IS routing protocol
   is specified in [RFC5308].  How to run a set of independent IP
   topologies with topology specific adjacencies, within a single IS-IS
   domain has been defined in IS-IS MT [RFC5120].

   Multiple mobile backhaul network user plane proposals like
   [I-D.ietf-dmm-srv6-mobile-uplane] and [I-D.herbert-ila-mobile] use
   IPv6 only solution using source routing, address transformation
   respectively.  It is possible to conceive, various parts of the
   backhaul networks use IPv4 and appropriate migration strategy needed
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