ATM Signalling Support for IP over ATM - UNI Signalling 4.0 Update
RFC 2331

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Network Working Group                                           M. Maher
Request for Comments: 2331                                       USC/ISI
Category: Standards Track                                     April 1998

   ATM Signalling Support for IP over ATM - UNI Signalling 4.0 Update

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

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

Abstract

   This memo describes how to efficiently use the ATM call control
   signalling procedures defined in UNI Signalling 4.0 [SIG40] to
   support IP over ATM environments as described in RFC 2225 [LAUB98]
   and in RFC 2332 [LUC98].  Among the new features found in UNI
   Signalling 4.0 are Available Bit Rate signalling and traffic
   parameter negotiation.  This memo highlights the features of UNI
   Signalling 4.0 that provide IP entities capabilities for requesting
   ATM service in sites with SVC support, whether it is private ATM or
   publicly provisioned ATM, in which case the SVC support is probably
   configured inside PVPs.

   This document is only relevant to IP when used as the well known
   "best effort" connectionless service. In particular, this means that
   this document does not pertain to IP in the presence of implemented
   IP Integrated Services.  The topic of IP with Integrated Services
   over ATM will be handled by a different specification or set of
   specifications being worked on in the ISSLL WG.

   This specification is a follow-on to RFC 1755, "ATM Signaling Support
   for IP over ATM", which is based on UNI 3.1 signalling [UNI95].
   Readers are assumed to be familiar with RFC 1755.

Maher                       Standards Track                     [Page 1]
RFC 2331        IP over ATM Signalling - SIG 4.0 Update       April 1998

Table of Contents

   1.  Conventions ...............................................   2
   2.  Overview ..................................................   2
   3.  Use of Protocol Procedures ................................   3
       3.1  VC Teardown...........................................   3
   4.  Overview of Call Establishment Message Content ............   3
   5.  Description of Information Elements .......................   4
       5.1  ATM Adaptation Layer Parameters ......................   4
       5.2  Broadband Low Layer Information  .....................   5
       5.3  Traffic Management Issues and Related IEs.............   5
            5.3.1  ATM Traffic Descriptor ........................   6
                   5.3.1.1  Tagging vs. Dropping .................   7
            5.3.2  Traffic Parameter Negotiation ..................  7
            5.3.3  Broadband Bearer Capability ....................  8
            5.3.4  QoS Parameter ..................................  8
                   5.3.4.1  Signalling of Individual QoS Parameters  8
       5.4  ATM Addressing Information ...........................   9
   6.  ABR Signalling In More Detail  ............................   9
   7.  Frame Discard Capability ..................................  10
   8.  Security Considerations ...................................  10
   9.  Acknowledgements...........................................  10
   10. References ................................................  10
   11. Author's Address ..........................................  12
   Appendix A  Sample Signalling Messages ........................  13
   Appendix B  ABR and nrt-VBR Signalling Guidelines for IP Routers 15
   Appendix C  Combinations of Traffic Related Parameters ........  18
   Full Copyright Statement ......................................  26

1.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [BRA97].

2.  Overview

   UNI Signalling version 4.0 (SIG 4.0) is the ATM Forum follow-on
   specification to UNI 3.1 signalling (UNI 3.1). Among the new features
   in SIG 4.0, those of particular interest to IP over ATM environments
   are:

        o Available Bit Rate (ABR) Signalling for Point-to-Point Calls
        o Traffic Parameter Negotiation
        o Frame Discard Support
        o Leaf Initiated Join (LIJ) Capability
        o ATM Anycast Capability
        o Switched Virtual Path (VP) Service

Maher                       Standards Track                     [Page 2]
RFC 2331        IP over ATM Signalling - SIG 4.0 Update       April 1998

   This memo highlights the first three capabilities listed above. The
   last three capabilities are not discussed because models for their