ZyXEL Communications GS3700 Series, Руководство пользователя

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4.1.3 What are the differences between IGMP Snooping
fast/normal/immediate leave?
Fast leave :
In fast leave mode, the switch itself sends out an IGMP Group-Specific
Query (GSQ) message right after receiving an IGMP leave message
from a host on a port. This determines whether other hosts connected to
the port should remain in the specific multicast group. This helps speed
up the leave process.
Normal leave :
In normal leave mode, when the Switch receives an IGMP leave
message from a host on a port, it forwards the message to the multicast
router. The multicast router then sends out an IGMP Group-Specific
Query (GSQ) message to determine whether other hosts connected to
the port should remain in the specific multicast group. The switch
forwards the query message to all hosts connected to the port and
waits for IGMP reports from hosts to update the forwarding table.
Immediate leave :
Select this option to set the Switch to remove this port from the multicast
tree once the ports receive an IGMP leave message. Select this option if
there is only one host connected to this port.