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What are the major benefits of IGMPv3?
The major enhancement in IGMPv3 is support for Single Source Multicast (SSM). When using SSM, the host specifies the source address that it will listen to. This is an important security enhancement since it prevents clients such as a set-top-box from receiving traffic generated by other subscribers on the network.
In addition, the request to change channels can be done using a single IGMPv3 request instead of requiring separate "leave one channel", and "join another channel" requests. This speeds up the process of changing channels, which is a critical capability in IPTV networks.
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