摘要
符合DOCSIS1.1规范的网络接入设备CM需要抑制组播.这种CM使用两种机制控制组播的转发,即设置策略过滤业务参数和专门的组播跟踪算法,而后者有passive IGMP和active IGMP两种模式.根据passive IGMP的要求和CM有固定的主机端口和固定的路由器端口的特点,设计并实现了一种电缆网络IGMP Snooping协议.该协议运行在MAC层,实现侦听CM收到的IGMP报文、维护组播组列表、过滤组播数据的功能.本设计在自主开发的物理层和MAC层芯片组成的HDTV(高清晰度电视)双向系统平台进行测试.
A network access device （ CM ） based on DOCSIS 1.1 must suppress multicast traffic. The CM controls the forwarding of multicast by administratively setting parameters for the policy-filter service and by a specific multieast tracking algorithm, and the latter indudes the passive IGMP mode and active IGMP mode. According to the demands of the passive IGMP mode and the characteristic that CM has a fixed host port and a fixed router port, a Data-Over-Cable IGMP Snooping protocol was designed and implemented. The protocol works on the MAC Layer, can snoop IGMP packets received by CM, maintains a list of multicast groups and can filter multicast data. The new protocol was tested in the bidirectional system platform for HDTV（ High Definition Television）, which consists of a self-devel- oped PHY and MAC chip.
出处
《小型微型计算机系统》
CSCD
北大核心
2009年第11期2118-2122,共5页
Journal of Chinese Computer Systems
基金
北京市科技重大项目(D0306008041021)资助
