QTECH QSW-3400 Инструкция по настройке - Manual (Page 271)

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34.3.2 DHCP Snooping Troubleshooting Help
If there is any problem happens when using DHCP Snooping function, please check if the
problem is caused by the following reasons:

Check that whether the global DHCP Snooping is enabled;

If the port does not react to invalid DHCP Server packets, please check that whether
the port is set as a non-trusted port of DHCP Snooping.