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What ways are there to make sure router multicast tables are up to date?

Keep in mind, there are three (3) versions of IGMP. While v2 introduced an explicit leave type, there's no "join". To be part of any group a host includes that group in a membership report. ...
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What ways are there to make sure router multicast tables are up to date?

A router configured to forward multicast to clients/receivers in attached subnets (by listening for and acting upon their IGMP messages) is usually also the designated IGMP Querier for the given ...

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