Research On LSP Loop Processing Method In MPLS Networks

MPLS(Multi-Protocol Label Switching) is a kind of bew tunneling technique which using label leadering data to realize high efficiency forwarding on an exoteric communications network.And it realizes transmitting connectionless data by connection_oriented switching networks. It's value is to gather connection schame attribute in a connectionless network.The development of internet raised the need of high speed and high quality of service.The accurrence of Multi-Protocal Label Switching offers a new kind of measure to these requirement.Almost all protocols including MPLS network can cause loop problem.Then the problem of moment loop goes into one of the problems need must be solved.The text explains the creator of loop in network and the necessity to take loop managing in the first place,and then analyzed three class of loop managing detailedly,analyzed the relative merits on loop method processing both here and abord.Described and compared the flow of Color Thread and Path Vector/Dissusion of loop preventing mechanism by example emphasisly,declared the common ground and differentia of these two bresenhams,arrived at that PD bresenhams has more power to support flow mergeing and CT bresenhams has better augmentability.At last, analysised the behaiour different in different system load and in different representative mechanisms of Time to Live(TTL), Loop Detection via Path Vectors(LDVP), Colored Thread(CT), Path Vector/Dissusion(PD) from three loop preventing mechanism.And analyzed the behavioral changement in diffirent system load when use the above four methods.Got that the influence degree of network by loop increased along with the network lood through simulation diagram.It has different influence of network behavior by different mechanism.CT bresenhams is the least of all.TTL bresenhams has some advantage because of its' simplest realization when in lower system load.When it has some load but load is not taunt,CT and PD bresenhams has more advantage relative to TTL and LDVP. But as fast as system load increasing especially when it has greater load CT bresenhams has great advantage relative to other bresenhams.Although CT bresenhams is more complexand has difficult realization relatively,but it is worth to ensure the entire network feature.It can get out that loop prevention...