Priority Queueing Applied to Expedited Forwarding: A Measurement-Based Analysis

The priority queueing mechanism is analysed to verify its effectiveness when applied for the support of Expedited Forwarding-based services in the Di erentiated Services environment. An experimental measurement-based methodology is adopted to outline its properties and end-to-end performance when supported in real transmission devices. A test layout has been set up over a metropolitan area for the estimation of one-way delay and instantaneous packet delay variation. The e ect of relevant factors like the bu ering architecture, the background traÆc packet size distribution and the EF traÆc pro le are considered. In particular, the complementary one-way delay probability function is computed for a given packet size distribution and the Aggregation Degree parameter is de ned to quantify the e ect of traÆc aggregation on end-to-end QoS. 1