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Title : Generic Connection Admission Control (GCAC) Algorithm Specification for IP/MPLS Networks
Author(s) : G. Ash, D. McDysan
Filename : draft-ash-gcac-algorithm-spec-00.txt
Pages : 23
Date : 2011-1-11
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, for
example, to reject voice over Internet Protocol (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, DSTE, PCE,
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 QoS for specified QoS constraints. The source is able to
compute a source route with high likelihood that MPLS GCAC via
elements along the selected path will in fact admit the request.
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.
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