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Diameter Base Protocol
RFC 3588

Document type: RFC - Proposed Standard (September 2003; Errata)
Obsoleted by RFC 6733
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 3588 (Proposed Standard)
Responsible AD: Randy Bush
Send notices to: <aboba@internaut.com>, <david@mitton.com>

Network Working Group                                         P. Calhoun
Request for Comments: 3588                               Airespace, Inc.
Category: Standards Track                                    J. Loughney
                                                                   Nokia
                                                              E. Guttman
                                                  Sun Microsystems, Inc.
                                                                 G. Zorn
                                                     Cisco Systems, Inc.
                                                                J. Arkko
                                                                Ericsson
                                                          September 2003

                         Diameter Base Protocol

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 (2003).  All Rights Reserved.

Abstract

   The Diameter base protocol is intended to provide an Authentication,
   Authorization and Accounting (AAA) framework for applications such as
   network access or IP mobility.  Diameter is also intended to work in
   both local Authentication, Authorization & Accounting and roaming
   situations.  This document specifies the message format, transport,
   error reporting, accounting and security services to be used by all
   Diameter applications.  The Diameter base application needs to be
   supported by all Diameter implementations.

Conventions Used In This Document

   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 BCP 14, RFC 2119
   [KEYWORD].

Calhoun, et al.             Standards Track                     [Page 1]
RFC 3588                Diameter Based Protocol           September 2003

Table of Contents

   1.  Introduction.................................................   6
       1.1.   Diameter Protocol.....................................   9
              1.1.1.   Description of the Document Set..............  10
       1.2.   Approach to Extensibility.............................  11
              1.2.1.   Defining New AVP Values......................  11
              1.2.2.   Creating New AVPs............................  11
              1.2.3.   Creating New Authentication Applications.....  11
              1.2.4.   Creating New Accounting Applications.........  12
              1.2.5.   Application Authentication Procedures........  14
       1.3.   Terminology...........................................  14
   2.  Protocol Overview............................................  18
       2.1.   Transport.............................................  20
              2.1.1.   SCTP Guidelines..............................  21
       2.2.   Securing Diameter Messages............................  21
       2.3.   Diameter Application Compliance.......................  21
       2.4.   Application Identifiers...............................  22
       2.5.   Connections vs. Sessions..............................  22
       2.6.   Peer Table............................................  23
       2.7.   Realm-Based Routing Table.............................  24
       2.8.   Role of Diameter Agents...............................  25
              2.8.1.   Relay Agents.................................  26
              2.8.2.   Proxy Agents.................................  27
              2.8.3.   Redirect Agents..............................  28
              2.8.4.   Translation Agents...........................  29
       2.9.   End-to-End Security Framework.........................  30
       2.10.  Diameter Path Authorization...........................  30
   3.  Diameter Header..............................................  32
       3.1.   Command Codes.........................................  35
       3.2.   Command Code ABNF specification.......................  36
       3.3.   Diameter Command Naming Conventions...................  38
   4.  Diameter AVPs................................................  38
       4.1.   AVP Header............................................  39
              4.1.1.   Optional Header Elements.....................  41
       4.2.   Basic AVP Data Formats................................  41

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