D-Link DES-1228 - Manual (Page 52)

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greater the probability the port will be chosen to forward packets. The
default value is 19.
Path Priority: Select a value between 0 and 255 to specify the
priority for a specified port for forwarding packets: the lower the
value, the higher the priority. The default is 128.
Configuration > Port Mirroring
Port Mirroring is a method of monitoring network traffic that forwards
a copy of each incoming and/or outgoing packet from one port of the
Switch to another port where the packet can be studied. This enables
network managers to better monitor network performances.
Figure 357 – Configuration > Port Mirroring
Selection options for the Source Ports are as follows: