應用QualNet模擬與比較群播路由協定之效能

Abstract

群播技術可應用於視訊會議、遠距教學...等，利用適合的群播路由協定，將相同資料山一個來源端傳送給多個接收端，可節省網路頻寬，達到善用網路資源的目的。傳統的群播路由協定多以樹狀結構做為基礎，依照網路架構中接收端密集的程度可分為兩類，一類是適用Dense-Mode的Source Tree，此類路由協定有DVMRP、MOSPF、PIM-DM;一類則是適時用Sparse-Mode的Share Tree，此類路由協定則有CBT、PIM-SM。\n本研究利用QualNet進行網路模擬實驗，將傳統適用於Dense-Mode的DVMRP、MOSPF、PTM-DM三種群播路由協定，由產生的實驗數據進行分析與比較，得到以下結論(1)就傳送封包數而言，MOSPF與PIM-DM兩種協定傳送multicast封包的數目較DVMRP少，代表佔用較少的網路頻寬;(2)就接收封包數目而言，PIM-DM接收到的封包數目最多，MOSPF次之，表示PIM-DM和MOSPF進行multicast封包傳送的成功率較高。總結而言，MOSPF與PIM-DM兩種路由協定對於multicast封包在網路上作傳輸，耗用較少網路頻寬，且可以得到較佳的傳輸效能。

Technology of multicast can be applied to the video-information meeting , long-distance teaching , utilize suitable multicast routing protocol , convey the same materials by one source end to a lot of receive end, can save the network frequently widely , will achieve the goal of making the best of resources of the network. Traditional multicast of the routing protocols are base on the tree structure , can be classified two types according to receiving the intensive degree of end in network structure, one is Source Tree of suitable Dense-Mode, the routing protocol based on this is DVMRP , MOSPF , PIM-DM; Another type is Share Tree of Sparse-Mode , the route protocol based on this has CBT , PIM-SM.\nThis research utilizes QualNet to carry on the simulation experiment of the network, simulate DVMRP , MOSPF , PIM-DM three tradition routing protocol that suitable for Dense-Mode, is analysed and compared by the experimental data emerging, from the result getting conclusion (1) it in respect to conveying the package to count, and figure of conveying multicast package of MOSPF or PIM-DM two protocol are less than DVMRP, it is wide frequently that representatives take up less networks bandwidth ; (2) in respect to receiving the figure of the package, the that PIM-DM receives the most total amount of multicast packet , MOSPF takes second place, shows that that PIM-DM and MOSPF carry on the success rate that multicast package convey. Summarizing, MOSPF and PIM-DM two kinds of multicast routing protocols transmit multicast package in the network, it is frequently wide not to consume the network , and can receive better transmission efficiency.