一种针对SSM的二层转发方法  

A Layer2 Forwarding Method to Handle the SSM Traffic

作　　者：王宇[1] 许生旺[1] 曹彦军[2] 姚君[2] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2011年第1期1-4,共4页Radio Engineering

摘　　要：以太网交换机仅依据目的介质访问控制(Media Access Control,MAC)子层地址进行数据转发,指定源组播(Source Specific Multicast,SSM)数据进入交换机后可能被转发至其他频道的订阅用户。针对此问题,在分析了SSM协议模型的以太网交换问题的基础上,提出了SSM数据标识及源标识的加入方法,详细设计了SSM转发表的建立过程,给出了SSM数据的转发流程,并对方法的可行性进行了仿真验证。Ethernet switches forward traffics based on destination MAC address,SSM traffics may be forwarded to the wrong subscribers when transmitted in the switches.In this paper,based on the analysis of Ethernet switches mechanism and SSM model,a method to identify SSM traffic and the source is proposed,then a way to establish SSM forwarding table in the switches is designed in detail,after which the forwarding chart of SSM traffic is also presented.Finally,the feasibility of the method is verified through simulation experiments.

关 键 词：二层转发 指定源组播 802.1Q 思科组管理协议(Cisco GROUP Management Protocol CGMP) 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]