OSPF Topology-Transparent Zone
RFC 8099

Document Type RFC - Experimental (February 2017; No errata)
Last updated 2017-02-28
Replaces draft-chen-ospf-ttz
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Jun 2016 - Publish Experimenta... )
Document shepherd Padma Pillay-Esnault
Shepherd write-up Show (last changed 2016-03-17)
IESG IESG state RFC 8099 (Experimental)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alia Atlas
Send notices to "padma.ietf@gmail.com" <padma.ietf@gmail.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                           H. Chen
Request for Comments: 8099                                         R. Li
Category: Experimental                               Huawei Technologies
ISSN: 2070-1721                                                A. Retana
                                                     Cisco Systems, Inc.
                                                                 Y. Yang
                                                                Sockrate
                                                                  Z. Liu
                                                            China Mobile
                                                           February 2017

                     OSPF Topology-Transparent Zone

Abstract

   This document presents a Topology-Transparent Zone (TTZ) in an OSPF
   area.  A TTZ comprises a group of routers and a number of links
   connecting these routers.  Any router outside of the zone is not
   aware of the zone.  A TTZ hides the internal topology of the TTZ from
   the outside.  It does not directly advertise any internal information
   about the TTZ to a router outside of the TTZ.  The information about
   the links and routers such as a link down inside the TTZ is not
   advertised to any router outside of the TTZ.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8099.

Chen, et al.                  Experimental                      [Page 1]
RFC 8099                Topology-Transparent Zone          February 2017

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
   (http://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.

Chen, et al.                  Experimental                      [Page 2]
RFC 8099                Topology-Transparent Zone          February 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Conventions Used in This Document . . . . . . . . . . . . . .   5
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Topology-Transparent Zone . . . . . . . . . . . . . . . . . .   5
     5.1.  Overview of Topology-Transparent Zone . . . . . . . . . .   5
     5.2.  TTZ Example . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Extensions to OSPF Protocols  . . . . . . . . . . . . . . . .   8
     6.1.  General Format of TTZ LSA . . . . . . . . . . . . . . . .   8
     6.2.  TTZ ID TLV  . . . . . . . . . . . . . . . . . . . . . . .   9
     6.3.  TTZ Router TLV  . . . . . . . . . . . . . . . . . . . . .   9
     6.4.  TTZ Options TLV . . . . . . . . . . . . . . . . . . . . .  10
     6.5.  Link Scope TTZ LSA  . . . . . . . . . . . . . . . . . . .  12
   7.  Constructing LSAs for TTZ . . . . . . . . . . . . . . . . . .  12
     7.1.  TTZ Migration Process . . . . . . . . . . . . . . . . . .  13
   8.  Establishing Adjacencies  . . . . . . . . . . . . . . . . . .  14
     8.1.  Discovery of TTZ Neighbors  . . . . . . . . . . . . . . .  14
     8.2.  Adjacency between TTZ Edge and TTZ-External Router  . . .  17
   9.  Advertisement of LSAs . . . . . . . . . . . . . . . . . . . .  17
     9.1.  Advertisement of LSAs within TTZ  . . . . . . . . . . . .  17
     9.2.  Advertisement of LSAs through TTZ . . . . . . . . . . . .  18
   10. Computation of Routing Table  . . . . . . . . . . . . . . . .  18
   11. Operations  . . . . . . . . . . . . . . . . . . . . . . . . .  18
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