D-Link DGS-1224T - Web Smart Switch, Manual

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Figure 21. Trunk Settings
Be sure that the selected trunk setting port must connect to the
device with a same VLAN group.
Mirror Setting
Port Mirroring is a method of monitoring network traffic that forwards
a copy of each incoming and/or outgoing packet from one port of a
network switch to another port where the packet can be studied. It
enables the manager to keep close track of switch performance and
alter it if necessary.
Configuring the port mirroring by assigning a source port from which
to copy all packets and a sniffer port where those packets will be sent.
The selection of the sniffer mode is as follow:
TX (transmit) mode: this mode will duplicate the data transmit from
the source port and forward to the sniffer port.
RX (receive) mode: this mode will duplicate the data that send to the
source and forward to the sniffer port.