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An Active Queue Management Mechanism Supporting the Priority Marking

With the increasing of Internet traffic, the RED (random early detection) algorithm depending on the average queue length has inherent flaws. RED cannot efficiently prevent the packet loss even if it combines with explicit congestion notification (ECN). Based on comparison between RED and BLUE, an enhanced active queue management mechanism, EBLUE (enhanced BLUE), is presented. The TCP congestion control with EBLUE is researched, and the token bucket is used to mark priority traffic at the network entry in order to provide the minimum rate guarantees. Finally, under the NS environment, the simulated experiment and performance evaluation are done in packet loss percent and link efficiency for EBLUE by comparing the mechanism with relative ones. The experimental results show that this mechanism can support bandwidth reservation services efficiently.