TRENDnet TEG-S3000I - Manual (Page 88)

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3. The following topology must be
set when the IP address of the
switch is not the smallest in the
subnet. The network will cause a
multi-cast storm from the IGMP
client report if it is in Auto mode.
All switches must be in disable
mode when the VOD server is
configured for IGMP Querier.
Note: It is suggested that the VOD server switch have the smallest IP address.