ATM Signalling Support for IP over ATM - UNI Signalling 4.0 Update
RFC 2331
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RFC - Proposed Standard
(April 1998; No errata)
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2013-03-02
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RFC 2331 (Proposed Standard)
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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
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