Research And Implement Of Traffic Management Technology On Large-scale ACR EMD

Along with various Streaming Media business emerging, "Best Effort" mode of traditional IP network can not meet the demands of new businesses, and Broadband Streaming Media business will ask for the evolution of Edge network structure. Router must afford end-to-end QoS, as the access point of Backbone network and Edge network.This dissertation based on the research and implement of traffic management technology on ACR EMD, and brought forward a traffic management mechanism supported different priority. It is assured of different drop possibility of different priority business by queue management, and assured of different QoS demand for different business by queue schedule.The main work and contributions in this dissertation are outlined as follows:1. Analyzing and comparing some mature arithmetic such as traffic measurement, queue management and queue schedule, this thesis put forward a traffic management mechanism named DPTM with good scalability, which is aimed at application demand. This mechanism is composed of DDPRED queue management arithmetic and PDDWRR queue schedule arithmetic. It ensured low delay of high-priority business and fair output bandwidth of low-priority business.2. Proposed DDPRED queue management arithmetic. It is used for different dropout rate of different business by setting different threshold. The function relations between threshold and dropout rate and delay is concluded, so we can set threshold flexibly in engineering according to the requirements of dropout rate and delay.3. Proposed PDDWRR queue schedule arithmetic that can support variable-length packets. Based on double schedule guidelines and two priority modes, this arithmetic will provide fine-partical QoS for different businesses. The planar Markov chain analysis of PDDWRR proved that it is justice in output bandwidth distribution for low-priority business. The simulation results shows that low delay of high-priority business and fair output bandwidth of low-priority business of PDDWRR are better than DRR.4. Aimed at project requirements, this dissertation presented hardware implement program of DPTM mechanism on ACR EMD. The structure of parallel distributed VPQ can support pipelining schedule, so DPTM mechanism can processed packet within wire speed for 10Gbps port. The test results of GE board shows that DPTM mechanism completely satisfied the demand for traffic management of uplink and downlink user's businesses on ACR.