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Resumen del manual
This enables them to send the correct multimedia streams to the correct destination. This How To Note describes basic and advanced IGMP configuration, in the following major sections: • an overview of IGMP and definitions of some of the IGMP terminology • examples and discussion of the most common IGMP functionality—IGMP snooping, IGMP Querier behaviour and selection, and IGMP proxy • examples and discussion of the advanced functionality available through AlliedWare’s feature-rich IGMP implementation • information for debugging • information about the STP state of the simple three-switch ring used in most examples Contents Introduction .............................................................................................................................................. 1 Products and software versions this note applies to ............................................................... 3 IGMP overview ......................................................................................................................................... 5 Queriers and Snoopers .................................................................................................................. 5 Messages ............................................................................................................................................. 6 Choosing group addresses ............................................................................................................. 7 IGMP snooping ......................................................................................................................................... 9 Example .............................................................................................................................................. 9 Explanation of IGMP snooping .................................................................................................... 11 C613-16087-00 REV C Introduction > Contents Multiple potential IGMP queriers ...................................................................................................... 15 Example ............................................................................................................................................ 15 Explanation of multiple potential IGMP queriers .................................................................... 17 IGMP proxy ............................................................................................................................................. 21 Example ............................................................................................................................................ 21 Explanation of IGMP proxy .......................................................................................................... 23 Query solicitation (rapid recovery from topology changes) ....................................................... 26 How query solicitation works ..................................................................................................... 26 Why convergence takes so long without query solicitation ................................................ 28 Speeding up IGMP convergence in a non-looped topology ................................................. 33 Enabling query solicitation on multiple switches in a looped topology ............................. 33 IGMP filtering (controlling multicast distribution) ......................................................................... 35 Example ............................................................................................................................................ 35 Explanation of IGMP filtering (controlling multicast distribution) ...................................... 38 IGMP throttling (limiting the number of streams for each subscriber) .................................... 40 Example ............................................................................................................................................ 40 Explanation of IGMP throttling (limiting the number of streams for each subscriber) . 43 Static IGMP ............................................................................................................................................. 48 Example ............................................................................................................................................ 48 Explanation of Static IGMP .......................................................................................................... 51 How clients leave groups: queries and timers ................................................................................ 58 Overview of leave process ........................................................................................................... 58 Querier timer values .............................................................................................................