IS-IS Topology-Transparent Zone
draft-ietf-lsr-isis-ttz-00

The information below is for an old version of the document
Document Type Active Internet-Draft (lsr WG)
Authors Huaimo Chen  , Richard Li  , Yi Yang  , Yanhe Fan  , Ning So  , Vic Liu  , Mehmet Toy  , Lei Liu  , Kiran Makhijani 
Last updated 2020-09-14
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Internet Engineering Task Force                                  H. Chen
Internet-Draft                                                     R. Li
Intended status: Experimental                                  Futurewei
Expires: March 18, 2021                                          Y. Yang
                                                                     IBM
                                                            A. Kumar S N
                                                                 RtBrick
                                                                  Y. Fan
                                                            Casa Systems
                                                                   N. So

                                                                  V. Liu

                                                                  M. Toy
                                                                 Verizon
                                                                  L. Liu
                                                                 Fujitsu
                                                            K. Makhijani
                                                               Futurewei
                                                      September 14, 2020

                    IS-IS Topology-Transparent Zone
                     draft-ietf-lsr-isis-ttz-00.txt

Abstract

   This document presents a topology-transparent zone in an area.  A
   zone is a block/piece of an area, which comprises a group of routers
   and a number of circuits connecting them.  It is abstracted as a
   virtual entity such as a single virtual node or zone edges mesh.  Any
   router outside of the zone is not aware of the zone.  The information
   about the circuits and routers inside the zone is not distributed to
   any router outside of the zone.

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

Chen, et al.             Expires March 18, 2021                 [Page 1]
Internet-Draft                  IS-IS TTZ                 September 2020

   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 March 18, 2021.

Copyright Notice

   Copyright (c) 2020 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.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Zone Abstraction  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Topology-Transparent Zone . . . . . . . . . . . . . . . . . .   5
     4.1.  Zone as a Single Node . . . . . . . . . . . . . . . . . .   5
       4.1.1.  An Example of Zone as a Single Node . . . . . . . . .   5
       4.1.2.  Zone Leader Election  . . . . . . . . . . . . . . . .   7
       4.1.3.  LS Generation for Zone as a Single Node . . . . . . .   8
       4.1.4.  Adjacency Establishment and Termination . . . . . . .   8
       4.1.5.  Computation of Routes . . . . . . . . . . . . . . . .  10
       4.1.6.  Extensions to Protocols . . . . . . . . . . . . . . .  11
     4.2.  Zone as Edges Full Mesh . . . . . . . . . . . . . . . . .  14
       4.2.1.  Extensions to IS-IS . . . . . . . . . . . . . . . . .  14
     4.3.  Advertisement of LSs  . . . . . . . . . . . . . . . . . .  15
       4.3.1.  Advertisement of LSs within Zone  . . . . . . . . . .  15
       4.3.2.  Advertisement of LSs through Zone . . . . . . . . . .  16
   5.  Seamless Migration  . . . . . . . . . . . . . . . . . . . . .  16
     5.1.  Transfer Zone to a Single Node  . . . . . . . . . . . . .  16
     5.2.  Roll Back from Zone as a Single Node  . . . . . . . . . .  16
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