[Diffserv-interest] congestion in diffserv network

["Feng Y" <feng6@uwindsor.ca>]

Hi,

Recently, I have read a paper about admission control in
Diffserv network. In the paper the author mentioned the
well-know diffserv “traffic overloading and internal
network state changing” problem. I wonder why the
overloading or even congestion occurs in diffserv network.
In diffserv architecture, the “DS ingress node is
responsible for ensuring that the traffic entering the DS
domain conforms to any traffic conditioning agreement (TCA)
between it and the other domain to which the ingress node
is connected” [RFC 2475]. Moreover,   “Traffic conditioning
performs metering, shaping, policing and/or re-marking to
ensure that the traffic entering the DS domain conforms to
the rules specified in the TCA, in accordance with the
domain's service provisioning policy”. So what causes the
overloading or congestion in diffserv? Does anyone explain
it for me or give me some references. Thanks in advance.

Yang

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