A Differentiated Services Code Point (DSCP) for Capacity-Admitted Traffic
RFC 5865
Internet Engineering Task Force (IETF) F. Baker
Request for Comments: 5865 J. Polk
Updates: 4542, 4594 Cisco Systems
Category: Standards Track M. Dolly
ISSN: 2070-1721 AT&T Labs
May 2010
A Differentiated Services Code Point (DSCP)
for Capacity-Admitted Traffic
Abstract
This document requests one Differentiated Services Code Point (DSCP)
from the Internet Assigned Numbers Authority (IANA) for a class of
real-time traffic. This traffic class conforms to the Expedited
Forwarding Per-Hop Behavior. This traffic is also admitted by the
network using a Call Admission Control (CAC) procedure involving
authentication, authorization, and capacity admission. This differs
from a real-time traffic class that conforms to the Expedited
Forwarding Per-Hop Behavior but is not subject to capacity admission
or subject to very coarse capacity admission.
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/rfc5865.
Baker, et al. Standards Track [Page 1]
RFC 5865 DSCP for Capacity-Admitted Traffic May 2010
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Problem . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Candidate Implementations of the Admitted Telephony
Service Class . . . . . . . . . . . . . . . . . . . . . . . 7
2.1. Potential implementations of EF in this model . . . . . . 7
2.2. Capacity admission control . . . . . . . . . . . . . . . 9
2.3. Recommendations on implementation of an Admitted
Telephony Service Class . . . . . . . . . . . . . . . . . 10
3. Summary: changes from RFC 4594 . . . . . . . . . . . . . . . 11
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
5. Security Considerations . . . . . . . . . . . . . . . . . . . 12
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1. Normative References . . . . . . . . . . . . . . . . . . 13
7.2. Informative References . . . . . . . . . . . . . . . . . 13
Baker, et al. Standards Track [Page 2]
RFC 5865 DSCP for Capacity-Admitted Traffic May 2010
1. Introduction
This document requests one Differentiated Services Code Point (DSCP)
from the Internet Assigned Numbers Authority (IANA) for a class of
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