Allied-telesis AT-S39 Instrukcja Użytkownika Strona 167

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Section II: Local and Telnet Management
167
Without IGMP snooping, a switch would have to flood multicast packets
out all of its ports, except the port on which it received the packet. Such
flooding of packets can negatively impact switch and network
performance.
The AT-8000 Series switch supports both IGMP Version 1 and Version 2.
The switch maintains its multicast groups through an adjustable time-
out value, which controls how frequently it expects to see reports from
end nodes that want to remain members of multicast groups, and by
processing leave requests.
Note
By default, IGMP snooping is disabled on the switch.
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