Generic Connection Admission Control (GCAC) Algorithm Specification for IP/MPLS Networks
RFC 6601
| Document | Type |
RFC - Experimental
(April 2012; No errata)
Was draft-ash-gcac-algorithm-spec (individual in rtg area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6601 (Experimental) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Adrian Farrel | ||
| IESG note | Young Lee (leeyoung@huawei.com) is the document shepherd. | ||
| Send notices to | leeyoung@huawei.com | ||
Internet Engineering Task Force (IETF) G. Ash, Ed.
Request for Comments: 6601 AT&T
Category: Experimental D. McDysan
ISSN: 2070-1721 Verizon
April 2012
Generic Connection Admission Control (GCAC) Algorithm Specification
for IP/MPLS Networks
Abstract
This document presents a generic connection admission control (GCAC)
reference model and algorithm for IP-/MPLS-based networks. Service
provider (SP) IP/MPLS networks need an MPLS GCAC mechanism, as one
motivational example, to reject Voice over IP (VoIP) calls when
additional calls would adversely affect calls already in progress.
Without MPLS GCAC, connections on congested links will suffer
degraded quality. The MPLS GCAC algorithm can be optionally
implemented in vendor equipment and deployed by service providers.
MPLS GCAC interoperates between vendor equipment and across multiple
service provider domains. The MPLS GCAC algorithm uses available
standard mechanisms for MPLS-based networks, such as RSVP, Diffserv-
aware MPLS Traffic Engineering (DS-TE), Path Computation Element
(PCE), Next Steps in Signaling (NSIS), Diffserv, and OSPF. The MPLS
GCAC algorithm does not include aspects of CAC that might be
considered vendor proprietary implementations, such as detailed path
selection mechanisms. MPLS GCAC functions are implemented in a
distributed manner to deliver the objective Quality of Service (QoS)
for specified QoS constraints. The objective is that the source is
able to compute a source route with high likelihood that via-elements
along the selected path will in fact admit the request. In some
cases (e.g., multiple Autonomous Systems (ASes)), this objective
cannot always be met, but this document summarizes methods that
partially meet this objective. MPLS GCAC is applicable to any
service or flow that must meet an objective QoS (delay, jitter,
packet loss rate) for a specified quantity of traffic.
Ash & McDysan Experimental [Page 1]
RFC 6601 GCAC Algorithm for IP/MPLS Networks April 2012
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. 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). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see 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/rfc6601.
Copyright Notice
Copyright (c) 2012 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
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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.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Ash & McDysan Experimental [Page 2]
RFC 6601 GCAC Algorithm for IP/MPLS Networks April 2012
Table of Contents
1. Introduction ....................................................4
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