Internet Engineering Task Force (IETF) K. Carlberg, Ed.
Request for Comments: 6735 G11
Category: Standards Track T. Taylor
ISSN: 2070-1721 PT Taylor Consulting
October 2012
Diameter Priority Attribute-Value Pairs
Abstract
This document defines Attribute-Value Pair (AVP) containers for
various priority parameters for use with Diameter and the
Authentication, Authorization, and Accounting (AAA) framework. The
parameters themselves are defined in several different protocols that
operate at either the network or application layer.
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/rfc6735.
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Carlberg & Taylor Standards Track [Page 1]RFC 6735 Resource Priorities AVPs October 2012
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1. Introduction
This document defines a number of Attribute-Value Pairs (AVP) that
can be used within the Diameter protocol [RFC6733] to convey a
specific set of priority parameters. These parameters are specified
in other documents, but are briefly described below. The
corresponding AVPs defined in Section 3 are extensions to those
defined in [RFC5866]. We note that all the priority fields
associated with the AVPs defined in this document are extensible and
allow for additional values beyond what may have already been defined
or registered with IANA.
Priority influences the distribution of resources and, in turn, the
QoS associated with that resource. This influence may be
probabilistic, ranging between (but not including) 0% and 100%, or it
may be in the form of a guarantee to either receive or not receive
the resource.
Another example of how prioritization can be realized is articulated
in Appendix A.3 (the Priority Bypass Model) of [RFC6401]. In this
case, prioritized flows may gain access to resources that are never
shared with non-prioritized flows.
1.1. Other Priority-Related AVPs
The 3rd Generation Partnership Project (3GPP) has defined several
Diameter AVPs that support prioritization of sessions. The following
AVPs are intended to be used for priority services (e.g., Multimedia
Priority Service):
- Reservation-Priority AVP as defined in [ETSI]
- MPS-Identifier AVP as defined in [3GPPa]
- Priority-Level AVP (as part of the Allocation Retention
Priority AVP) as defined in [3GPPb]
- Session-Priority AVP as defined in [3GPPc] and [3GPPd]
Carlberg & Taylor Standards Track [Page 2]RFC 6735 Resource Priorities AVPs October 2012
Both the Reservation-Priority AVP and the Priority-Level AVP can
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