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    • 7. 发明授权
    • Method and system for intelligently forwarding multicast packets
    • 智能转发组播报文的方法和系统
    • US09112715B2
    • 2015-08-18
    • US12765765
    • 2010-04-22
    • Nitin JainLee ChenEarl FergusonMin Zhu
    • Nitin JainLee ChenEarl FergusonMin Zhu
    • H04L12/18
    • H04L12/1886
    • A routing system utilizes a layer 2 switch interconnecting several routers to intelligently forward multicast packets throughout an interne exchange carrying multicast content. The layer 2 switch performs protocol snooping to extract a lookup key that is based on network layer protocol information. The lookup key is uniquely formulated to support either shared or explicit source distribution trees. The lookup key is used to query a forwarding memory that returns an outgoing port index. The outgoing port index points to one or more outgoing ports that are eligible to receive the multicast packet. The outgoing ports are also connected to the neighboring device(s) that are designated to receive the multicast packet. The routing system also supports real time maintenance and updating of the forwarding memory based on the periodic exchange of control messages. The routing system is configured to support PIM routers operating in PIM SM or PIM SSM modes. However, the routing system can also support other multicast protocols and/or standards.
    • 路由系统利用互连多个路由器的层2交换机在携带多播内容的内部交换机中智能地转发多播分组。 第二层交换机执行协议侦听,提取基于网络层协议信息的查找密钥。 查找密钥是独一无二的,用于支持共享或明确的源分发树。 查询键用于查询返回出站端口索引的转发内存。 出站端口索引指向一个或多个有资格接收组播数据包的输出端口。 输出端口也连接到被指定为接收多播分组的相邻设备。 路由系统还支持基于控制消息的周期性交换的转发存储器的实时维护和更新。 路由系统配置为支持以PIM SM或PIM SSM模式运行的PIM路由器。 然而,路由系统还可以支持其他多播协议和/或标准。