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OSPF Topology-Transparent Zone
draft-chen-ospf-ttz-09

Document type: Active Internet-Draft (individual)
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Last updated: 2014-10-26
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Internet Engineering Task Force                                  H. Chen
Internet-Draft                                                     R. Li
Intended status: Standards Track                            A. Kumar S N
Expires: April 29, 2015                              Huawei Technologies
                                                              G. Cauchie

                                                               A. Retana
                                                     Cisco Systems, Inc.
                                                                   N. So
                                                     Tata Communications
                                                                  V. Liu
                                                            China Mobile
                                                                  M. Toy
                                                                 Comcast
                                                                  L. Liu
                                                                UC Davis
                                                        October 26, 2014

                     OSPF Topology-Transparent Zone
                       draft-chen-ospf-ttz-09.txt

Abstract

   This document presents a topology-transparent zone in a domain.  A
   topology-transparent zone 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.  The information about the links and routers
   inside the zone is not distributed to any router outside of the zone.
   Any link state change such as a link down inside the zone is not seen
   by any router outside of the zone.

Status of this Memo

   This Internet-Draft is submitted to IETF 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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 29, 2015.

Chen, et al.             Expires April 29, 2015                 [Page 1]
Internet-Draft          Topology-Transparent Zone           October 2014

Copyright Notice

   Copyright (c) 2014 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.             Expires April 29, 2015                 [Page 2]
Internet-Draft          Topology-Transparent Zone           October 2014

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  5
   3.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Topology-Transparent Zone  . . . . . . . . . . . . . . . . . .  5
     4.1.  Overview of Topology-Transparent Zone  . . . . . . . . . .  5
     4.2.  An Example of TTZ  . . . . . . . . . . . . . . . . . . . .  6
   5.  Extensions to OSPF Protocols . . . . . . . . . . . . . . . . .  7
     5.1.  Opaque LSAs for TTZ  . . . . . . . . . . . . . . . . . . .  7
     5.2.  A TTZ Capability TLV in Router Information LSA . . . . . . 10
   6.  Constructing LSAs for TTZ  . . . . . . . . . . . . . . . . . . 11
   7.  Establishing Adjacencies . . . . . . . . . . . . . . . . . . . 12
     7.1.  Discover TTZ Neighbor over Normal Adjacency  . . . . . . . 12
     7.2.  Establishing TTZ Adjacencies . . . . . . . . . . . . . . . 12
     7.3.  Adjacency between TTZ Edge and Router outside  . . . . . . 13
   8.  Distribution of LSAs . . . . . . . . . . . . . . . . . . . . . 13
     8.1.  Distribution of LSAs within TTZ  . . . . . . . . . . . . . 14
     8.2.  Distribution of LSAs through TTZ . . . . . . . . . . . . . 14
   9.  Computation of Routing Table . . . . . . . . . . . . . . . . . 14

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