ST2+ over ATM Protocol Specification - UNI 3.1 Version
RFC 2383

Document Type RFC - Informational (August 1998; No errata)
Was draft-suzuki-st2-over-atm (individual)
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Network Working Group                                          M. Suzuki
Request for Comments: 2383                                           NTT
Category: Informational                                      August 1998

                             ST2+ over ATM
                Protocol Specification - UNI 3.1 Version

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

Abstract

   This document specifies an ATM-based protocol for communication
   between ST2+ agents. The ST2+ over ATM protocol supports the matching
   of one hop in an ST2+ tree-structure stream with one ATM connection.
   In this document, ATM is a subnet technology for the ST2+ stream.

   The ST2+ over ATM protocol is designed to achieve resource-
   reservation communications across ATM and non-ATM networks, to extend
   the UNI 3.1/4.0 signaling functions, and to reduce the UNI 4.0 LIJ
   signaling limitations.

   The specifications of the ST2+ over ATM protocol consist of a
   revision of RFC 1819 ST2+ and specifications of protocol interaction
   between ST2+ and ATM on the user plane, management plane, and control
   plane which correspond to the three planes of the B-ISDN protocol
   reference model.

1. Introduction

1.1 Purpose of Document

   The purpose of this document is to specify an ATM-based protocol for
   communication between ST2+ agents.

   The ST2+ over ATM protocol is designed to support the matching of one
   hop in an ST2+ tree-structure stream with one ATM connection; it is
   not designed to support an entire ST2+ tree-structure stream with a
   point-to-multipoint ATM connection only.

Suzuki                       Informational                      [Page 1]
RFC 2383                     ST2+ over ATM                   August 1998

   Therefore, in this document, ATM is only a subnet technology for the
   ST2+ stream.  This specification is designed to enable resource-
   reservation communications across ATM and non-ATM networks.

1.2 Features of ST2+ over ATM Protocol

   o Enables resource-reservation communications across ATM and non-ATM
     networks.

     ATM native API supports resource-reservation communications only
     within an ATM network; it cannot support interworking with non-ATM
     networks. This is because

     - ATM native API cannot connect terminals without an ATM interface.

     - ATM native API does not support IP addressing and SAP (port)
       addressing systems.

   o Extends UNI 3.1/4.0 signaling functions.

     ST2+ SCMP supports MTU-size negotiation at all hops in an ST2+
     tree-structure stream. UNI 3.1/4.0 supports only max CPCS_SDU
     (i.e., MTU) negotiation with the called party of a point-to-point
     call or with the first leaf of a point-to-multipoint call.

   o Reduces UNI 4.0 LIJ signaling limitations.

     The ST2+ over ATM protocol supports UNI 4.0 LIJ Call Identifier
     notification from the root to the leaf by using an ST2+ SCMP
     extension.  LIJ Call Identifier discovery at the leaf is one of the
     major unsolved problems of UNI 4.0, and the ST2+ over ATM protocol
     provides a solution.

     Note: The UNI 3.1 version of the ST2+ over ATM protocol does not
     support the above feature. It will be supported by the UNI 3.1/4.0
     version.

1.3 Goals and Non-goals of ST2+ over ATM Protocol

   The ST2+ over ATM protocol is designed to achieve the following
   goals.

   o Specify protocol interaction between ST2+ [4] and ATM on the ATM
     Forum Private UNI 3.1/4.0 (Sb point) [10, 11].

     Note: The UNI 3.1 version of the ST2+ over ATM protocol does not
     support UNI 4.0. It will be supported by the UNI 3.1/4.0 version.

Suzuki                       Informational                      [Page 2]
RFC 2383                     ST2+ over ATM                   August 1998

   o Support ST2+ stream across ATM and non-ATM networks.

   o Define one VC on the UNI corresponding to one ST2+ hop; this VC is
     not shared with other ST2+ hops, and also this ST2+ hop is not
     divided into multiple VCs.

   o Support both SVC and PVC.

   o Not require any ATM specification changes.

   o Coexist with RFC 1483 [16] IPv4 encapsulation.

   o Coexist with RFC 1577 [17] ATMarp.

   o Coexist with RFC 1755 [18] ATM signaling for IPv4.

   o Coexist with NHRP [19].

   Because ST2+ is independent of both routing and IP address resolution
   protocols, the ST2+ over ATM protocol does not specify the following
   protocols.

   o IP-ATM address resolution protocol

   o Routing protocol

   Because the ST2+ over ATM protocol is specified for the UNI, it is
   independent of:

   o NNI protocol

   o Router/switch architecture

Suzuki                       Informational                      [Page 3]
RFC 2383                     ST2+ over ATM                   August 1998
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