D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 39)

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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.
Both (transmit and receive) mode: this mode will duplicate both the
data transmit from and data that send to the source port, then it will
forward to the sniffer port.
Figure 22. Mirror setting
IEEE 802.1P QoS Setting
To set the Switch QoS base on IEEE 802.1p,
Figure 23. IEEE 802.1P-based QoS setting
Spanning Tree Setting
This Switch supports the 802.1d Spanning Tree Protocol.
Every segment will have a single path to the root bridge. All
bridges listen for BPDU packets. However, BPDU packets are sent