Improvement And Implementation Of Diffserv Based On MPLS

With the continuous development of the service quality of the network technology,the traditional deployment in MPLS network edge routers on the differential service scheme in practical application and maintenance process exposed some problems,mainly as follows:(1)In the MPLS network,users cannot use their own configuration to implement different differentiated service modes for traffic entering and leaving the same edge router.;(2)When sending packets out of an MPLS network,the user cannot specify whether to use the priority field in the IP header for queue scheduling or to use the priority field in the VLAN for queue scheduling in encapsulating IP packets in VLAN format.In order to solve the above problems,a differential service separation solution is proposed.The main research and contributions of this thesis are as follows:(1)A differential service separation scheme is proposed.This solution allows users to configure different service modes for service traffic entering and leaving the edge router of the same MPLS network.At the same time,for IP packets encapsulating VLAN format,the user can also specify that the priority field in the IP header be used for queue scheduling.Or do the queue scheduling with the priority field in the VLAN.This thesis designed and implemented two configuration methods,namely command line mode and network management mode.(2)By analyzing the limitations of the differential polling queue scheduling algorithm,this thesis proposes a token scheduling algorithm based on token deduction.The algorithm effectively reduces the scheduling overhead and can alleviate the number of tokens selected for output burstiness.And jittery effects.(3)Combined with the practical application scenario,the separation service scheme implemented in this thesis was tested in several aspects using the router environment provided by a communication company in Nanjing,including basic function testing and non-functional testing.The test results show that the improved differential service mode separation solution solves the problems exposed by the traditional differential service solution.Satisfy the customer's basic functional requirements and non-functional requirements,can better improve service quality.