基于虚拟网络的IP多播原理实验设计

Experimental design for principle of IP multicast based on virtual network

采用GNS3中整合的IOU和VirtualBox构建虚拟网络实验环境,设计了IP多播原理实验方案。利用Wireshark协议分析软件捕获报文,通过对报文的分析阐述了IGMP协议加入、离开多播组的工作过程,PIM-SM协议共享树和最短路径树的加入、剪枝过程,多播源注册过程,共享树和最短路径树之间的切换过程。验证了IGMP和PIM-SM协议的工作过程,使学生从理论和实践两方面更好地理解IP多播的工作原理。

By using integrated IOU in GNS3 and VirtualBox software to build a virtual network experimental environment in a single computer,this paper designs the experimental scheme of IP multicast.Using Wireshark software to capture packets,through the analysis of packets,this paper expounds on the working processes of the IGMP protocol to join and leave the multicast group,the joining process and the pruning process of the PIM-SM（Protocol Independent Multicast-Sparse Mode）rendezvous point tree and the shortest path tree,the registration process of the multicast source,the switchover process between the rendezvous point tree and the shortest path tree.This paper verifies the IGMP protocol and the PIM-SM protocol＇working process,and can let students better understand the working principle of IP multicast from both theoretical and practical aspects.