TE LSP Crossing Topology-Transparent Zones
draft-chen-teas-rsvp-ttz-02

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Internet Engineering Task Force                                  H. Chen
Internet-Draft                                                     R. Li
Intended status: Standards Track                     Huawei Technologies
Expires: December 3, 2017                                     G. Cauchie

                                                               A. Retana
                                                     Cisco Systems, Inc.
                                                                   N. So
                                                     Tata Communications
                                                                   F. Xu
                                                                  M. Toy
                                                                 Verizon
                                                                  V. Liu
                                                            China Mobile
                                                                  L. Liu
                                                                 Fijitsu
                                                            June 1, 2017

               TE LSP Crossing Topology-Transparent Zones
                    draft-chen-teas-rsvp-ttz-02.txt

Abstract

   A topology-transparent zone is virtualized as the edges of the zone
   fully connected.  This document presents the procedures for the
   establishment of Traffic Engineering (TE) LSPs crossing Topology-
   Transparent Zones.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 3, 2017.

Copyright Notice

Chen, et al.            Expires December 3, 2017                [Page 1]
Internet-Draft                TE LSP x TTZs                    June 2017

   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
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   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
   2.  Conventions Used in This Document . . . . . . . . . . . . . . . 3
   3.  Overview of Topology-Transparent Zone (TTZ) . . . . . . . . . . 3
   4.  Set up TE LSPs crossing TTZs  . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
   7.  Normative References  . . . . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

Chen, et al.            Expires December 3, 2017                [Page 2]
Internet-Draft                TE LSP x TTZs                    June 2017

1.  Introduction

   The number of routers in a network becomes larger and larger as the
   Internet traffic keeps growing.  Through splitting the network into
   multiple areas, we can extend the network further.  However, there
   are a number of issues when a network is split further into more
   areas.

   At first, dividing a network into more areas is a very challenging
   and time consuming since it is involved in significant network
   architecture changes.

   Secondly, the services carried by the network may be interrupted
   while the network is being split into more areas.

   Furthermore, it is complex for a TE LSP crossing areas to be setup.
   In one option, a TE path crossing areas is computed by using
   collaborating PCEs [RFC5441] through PCEP[RFC5440], which is not easy
   to configure.

   Topology-transparent zone (TTZ) resolves these issues.  This document
   briefs TTZ and presents the procedures for the establishment of TE
   LSPs crossing TTZs.
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