TRENDnet TEG-S3000I - Manual (Page 87)

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a network:
1. Auto mode needs to be enabled when the
router’s IP address is smaller than other
switches in the subnet.
2. IGMP needs to be enabled when the
router’s IP address is not smaller than
other switches in the subnet. This
Router supports IGMP protocol, but
IGMP has to be enabled, and the
Router has to be the Querier.