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Realm-Based Redirection In Diameter
RFC 7075

Internet Engineering Task Force (IETF)                           T. Tsou
Request for Comments: 7075                     Huawei Technologies (USA)
Updates: 6733                                                     R. Hao
Category: Standards Track                                  Comcast Cable
ISSN: 2070-1721                                           T. Taylor, Ed.
                                                     Huawei Technologies
                                                           November 2013

                  Realm-Based Redirection In Diameter

Abstract

   The Diameter protocol includes a capability for message redirection,
   controlled by an application-independent "redirect agent".  In some
   circumstances, an operator may wish to redirect messages to an
   alternate domain without specifying individual hosts.  This document
   specifies an application-specific mechanism by which a Diameter
   server or proxy (node) can perform such a redirection when the
   Straightforward-Naming Authority Pointer (S-NAPTR) is not used for
   dynamic peer discovery.  A node performing this new function is
   referred to as a "Realm-based Redirect Server".

   This memo updates Sections 6.13 and 6.14 of RFC 6733 with respect to
   the usage of the Redirect-Host-Usage and Redirect-Max-Cache-Time
   Attribute-Value Pairs (AVPs).

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/rfc7075.

Tsou, et al.                 Standards Track                    [Page 1]
RFC 7075           Realm-Based Redirection In Diameter     November 2013

Copyright Notice

   Copyright (c) 2013 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Support of Realm-Based Redirection Within Applications  . . .   4
   3.  Realm-Based Redirection . . . . . . . . . . . . . . . . . . .   5
     3.1.  Configuration of the Realm-Based Redirect Server  . . . .   5
     3.2.  Behavior of Diameter Nodes  . . . . . . . . . . . . . . .   6
       3.2.1.  Behavior at the Realm-Based Redirect Server . . . . .   6
       3.2.2.  Proxy Behavior  . . . . . . . . . . . . . . . . . . .   6
       3.2.3.  Client Behavior . . . . . . . . . . . . . . . . . . .   7
     3.3.  The Redirect-Realm AVP  . . . . . . . . . . . . . . . . .   7
     3.4.  DIAMETER_REALM_REDIRECT_INDICATION Protocol Error Code  .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   9

Tsou, et al.                 Standards Track                    [Page 2]
RFC 7075           Realm-Based Redirection In Diameter     November 2013

1.  Introduction

   The Diameter base protocol [RFC6733] specifies a basic redirection
   service provided by a redirect agent.  The redirect indication
   returned by the redirect agent is described in Section 6.1.8 and
   Sections 6.12 through 6.14 of [RFC6733].  It provides one or more
   individual hosts to the message sender as the destination of the
   redirected message.

   However, consider the case where an operator has offered a specific
   service but no longer wishes to do so.  The operator has arranged for
   an alternative domain to provide the service.  To aid in the

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