2 SSM - IGMPv3

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■视频名称：

    《2 SSM - IGMPv3》

■所属专辑：

    《Developing Interdomain Multicast Networks》（跨域组播）

■视频时长：

    12分15秒

■内容简介：

    IGMPv3是IETF标准IGMP的第三版协议，主机通过IGMP通告最后一跳路由器感兴趣的组播组。IGMPv3使主机在加入组播组的同时，还可以对数据源进行控制，所以IGMPv3可以与SSM配合使用。主机通过IGMPv3宣告接收组播组的所有数据，称为EXCLUDE模式；也可以指定数据源，称为INCLUDE模式。

    IGMPv3可以兼容ISM（Internet Standard Multicast）和SSM（Source Specific Multicast），最后一跳路由器可以接收EXCLUDE或INCLUDE模式的IGMPv3通告。对于工作在SSM状态的组播组，最后一跳路由器只接收INCLUDE模式的IGMPv3通告，忽略EXCLUDE模式的IGMPv3通告。

■Abstract：

    IGMPv3 is the third version of the Internet Engineering Task Force (IETF) standards track protocol used by hosts to signal membership to last hop routers of multicast groups. IGMPv3 introduces the ability for hosts to signal group membership with filtering capabilities with respect to sources, which is required for SSM. A host can either signal that it wants to receive traffic from all sources sending to a group except for some specific sources (called EXCLUDE mode), or that it wants to receive traffic only from some specific sources sending to the group (called INCLUDE mode).

    IGMPv3 can operate with both ISM and SSM. In ISM, the last hop router accepts both EXCLUDE and INCLUDE mode reports. In SSM, the last hop router accepts only INCLUDE mode reports, but ignores EXCLUDE mode reports.