Operating Virtual Concatenation (VCAT) and the Link Capacity Adjustment Scheme (LCAS) with Generalized Multi-Protocol Label Switching (GMPLS)
RFC 6344

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Internet Engineering Task Force (IETF)                 G. Bernstein, Ed.
Request for Comments: 6344                             Grotto Networking
Updates: 4606                                                D. Caviglia
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                R. Rabbat
                                                                  Google
                                                         H. van Helvoort
                                                                  Huawei
                                                             August 2011

               Operating Virtual Concatenation (VCAT) and
               the Link Capacity Adjustment Scheme (LCAS)
        with Generalized Multi-Protocol Label Switching (GMPLS)

Abstract

   This document describes requirements for, and the use of, the
   Generalized Multi-Protocol Label Switching (GMPLS) control plane in
   support of the Virtual Concatenation (VCAT) layer 1 inverse
   multiplexing data plane mechanism and its companion Link Capacity
   Adjustment Scheme (LCAS).  LCAS can be used for hitless dynamic
   resizing of the inverse multiplex group.  These techniques apply to
   Optical Transport Network (OTN), Synchronous Optical Network (SONET),
   Synchronous Digital Hierarchy (SDH), and Plesiochronous Digital
   Hierarchy (PDH) signals.  This document updates RFC 4606 by making
   modifications to the procedures for supporting virtual concatenation.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   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/rfc6344.

Bernstein, et al.            Standards Track                    [Page 1]
RFC 6344           Operating VCAT and LCAS with GMPLS        August 2011

Copyright Notice

   Copyright (c) 2011 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.

Bernstein, et al.            Standards Track                    [Page 2]
RFC 6344           Operating VCAT and LCAS with GMPLS        August 2011

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................4
   2. VCAT/LCAS Scenarios and Specific Requirements ...................4
      2.1. VCAT/LCAS Interface Capabilities ...........................4
      2.2. Member Signal Configuration Scenarios ......................5
      2.3. VCAT Operation with or without LCAS ........................6
      2.4. VCGs and VCG Members .......................................7
   3. VCAT Data and Control Plane Concepts ............................7
   4. VCGs Composed of a Single Member Set (One LSP) ..................8
      4.1. One-Shot VCG Setup .........................................8
      4.2. Incremental VCG Setup ......................................9
      4.3. Procedure for VCG Reduction by Removing a Member ...........9
      4.4. Removing Multiple VCG Members in One Shot .................10
      4.5. Teardown of Whole VCG .....................................10
   5. VCGs Composed of Multiple Member Sets (Multiple LSPs) ..........10
      5.1. Signaled VCG Service Layer Information ....................11
      5.2. CALL_ATTRIBUTES Object VCAT TLV ...........................12
      5.3. Procedures for Multiple Member Sets .......................14
           5.3.1. Setting Up a New VCAT Call and VCG Simultaneously ..14
           5.3.2. Setting Up a VCAT Call and LSPs without a VCG ......14
           5.3.3. Associating an Existing VCAT Call with a New VCG ...15
           5.3.4. Removing the Association between a Call and VCG ....15
           5.3.5. VCG Bandwidth Modification .........................15
   6. Error Conditions and Codes .....................................16
   7. IANA Considerations ............................................17