Research And Simulation Of QoS In Network Processor

With the continuous development of Internet and IP network technologies,the original network service message types were relatively single,and gradually transformed into multiple service types such as file transfer,voice services,and video services.Traditional IP network technology cannot meet the service quality requirements of multiple services.It must rely on QoS(Quality of Service)technology to provide guarantees for various business service quality.Queue scheduling algorithm is the core of QoS technology,and it is an important method to realize various business service quality in differentiated service model.For the increasing complexity of network services,the single-structure queue management technology cannot meet the service quality of service.It is necessary to study the queue scheduling algorithm to meet the complex network structure.This article first analyzes the commonly used QoS service models,compares the differences between different service models,and focuses on analyzing differentiated service models.According to the network processor's packet processing flow,the main modules and functions included in the network processor are analyzed,and these modules are analyzed respectively,including ingress queue management,message editing,traffic supervision and shaping in QoS,and traffic scheduling,Congestion avoidance and drop technologies.It also analyzes several common scheduling algorithms in QoS,including its principle,pseudo-code implementation,advantages and disadvantages.Finally,based on the OPNET Modeler platform,various scheduling algorithms are designed and implemented,and the differences of various scheduling algorithms are analyzed and compared.The study found that in the case of multiple service forwarding,priority is given to weighted polling and weighted fairness algorithms.By setting different weights,the quality of service of various services can be reasonably guaranteed;priority is given to priority algorithms when a single service is guaranteed,Can guarantee that all bandwidth is used by the service.