Domain based congestion management

Details Domain based congestion management Domain based congestion management

2005-01-04

2005-01-04

Olms, Douglas (Department: 2661)

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

C370S231000, C370S235100

Reexamination Certificate

active

06839321

ABSTRACT:
The Domain-based Congestion Management method and apparatus detects and regulates congestion in a Diff-serv network. It use an improvRED method for congestion detection at the core routers and token bucket filters for traffic regulation at the ingress nodes. In addition, improvRED also provides feedback control. ImprovRED uses three thresholds for detecting congestion: a minth, a maxth and a FeedbackThreshold, which lakes a value between the minth and the maxth thresholds. Whenever the average queue size is greater than minth and less than Feedback-Threshold, all outgoing packets are marked appropriately to indicate a potential onset of a congestion period. When the average queue size is greater th FeedbackThreshold (but less than maxth) packets are dropped probabilistically and all the outgoing packets are marked appropriately to denote the dropping phase. When the average queue size is greater than the maximum threshold, all incoming packets are dropped.

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