Topology-Transparent Zone
draft-chen-isis-ttz-07

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Last updated 2019-10-09
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Internet Engineering Task Force                                  H. Chen
Internet-Draft                                                 A. Retana
Intended status: Standards Track                                   R. Li
Expires: April 11, 2020                                        Futurewei
                                                            A. Kumar S N
                                                                 RtBrick
                                                                   N. So

                                                                  V. Liu

                                                                  M. Toy
                                                                 Verizon
                                                                  L. Liu
                                                                 Fijitsu
                                                         October 9, 2019

                       Topology-Transparent Zone
                       draft-chen-isis-ttz-07.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 pseudo node or zone edges mess.  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 to IETF in full conformance with the
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   This Internet-Draft will expire on April 11, 2020.

Chen, et al.             Expires April 11, 2020                 [Page 1]
Internet-Draft                     TTZ                      October 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
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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 Pseudo 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 . . . . . . .   7
       4.1.4.  Adjacency Establishment . . . . . . . . . . . . . . .   8
       4.1.5.  Computation of Routes . . . . . . . . . . . . . . . .  10
       4.1.6.  Extensions to Protocols . . . . . . . . . . . . . . .  10
     4.2.  Zone as Edges Full Mess . . . . . . . . . . . . . . . . .  12
       4.2.1.  Extensions to IS-IS . . . . . . . . . . . . . . . . .  13
     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  . . . . . . . . . .  17
   6.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .  19
   7.  Security  Considerations  . . . . . . . . . . . . . . . . . .  19
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  19
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  19
     10.2.  Informative References . . . . . . . . . . . . . . . . .  20
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