![]() ![]() Why did the switch add the interface of the router in the CAM table? The interfaces that were added are for H1, R1 and the internal interface. ![]() In the CAM table above you can see an entry for MAC address 0100.5e01.0101 which corresponds with multicast group 239.1.1.1. To answer these questions we’ll have to take a closer look at IGMP snooping. How do we deal with the video server that never joins any multicast groups but only streams traffic to it? What do we do when we use IGMP version 1? Our hosts will not send any leave group messages so there’s nothing to snoop. This sounds simple but there is more to this story. As the name implies, this is done by listening to IGMP traffic between the router and hosts:When the host sends a membership report for a multicast group then the switch adds an entry in the CAM table for the interface that is connected to the host.When the host sends a leave group for a multicast group then the switch removes an entry in the CAM table for the interface that is connected to the host. IGMP snooping allows us to constrain our multicast traffic. ![]() All hosts will receive our traffic whether they want it or not. Since this MAC address has never been used as a source, all multicast traffic will be flooded. ![]() When the switch receives this traffic then it will do a lookup for MAC address 0100.5e01.0101. Above we have a video server that is streaming multicast traffic to destination 239.1.1.1, the destination MAC address will be 0100.5e01.0101. ![]()
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