Convergence Analysis Of Distributed Routing And Centralized Routing

Applying which routing protocol or routing technology wields the significant influence on the design of the whole network architecture and the function of network construction. As we all know, routing protocol guides the transmission of IP packets, so in the actual engineering choosing what kind of routing protocol, is a matter of quality of the network. For engineering personnel, choosing what kind of routing protocols, is rely on previous experience in engineering. It is no specific quantitative contrast process, so guidance to engineering practice have certain blindness. The significance of this thesis lies in this, to examine the convergence of different routing protocols through simulation software simulation, and for a quantification of the differences, in order to the more objective data contrast method to guide network engineering construction work.This thesis is conducted through two different simulation software:OPNET and Mininet to make a pointed simulation on distributed routing and centralized routing, which analyzes the respective characteristics of those two routings from the performance of stable topology construction based on the data (OSPF and RIP are the data for convergence time while OpenFlow is the data to construct stable link time) by the simulation. The detailed contents are as follows:(1) The representative of applying OPNET to simulate distributed routing:OSPF and RIP protocols, which analyzes the convergence times of the router, the times of sent Hello messages, the sent package number (for OSPF) of LSA and some other statistical data through the equipped statistical module of OPNET to summarize the performance and property of the distributed system.(2) The representative of applying Floodlight and Mininet to simulate centralized routing: OpenFlow, which sends Controller flow table request to Switch through capturing packet software Wireshark, returns Switch flow table by Controller, captures packet and analyzes the needed time to build a stable link in OpenFlow topology through the data of capturing packet.(3) By comparing the simulation data of distributed routing and centralized route, the merits and characteristics of distributed routing and centralized route are summarized.