Configuration > Port Mirroring - D-Link 24-Port 10/100Mbps PoE Web Smart Switch with 4-Port 10/100/1000Base-T and 2-Port Combo SFP DES-1228P User Manual

Root Bridge: Displays the MAC address of the Root Bridge.
Root port: Displays the root port.
Root Path Cost: Shows the root path cost.
Path Cost: This defines a metric that indicates the relative cost of
forwarding packets to specified port list. The lower the number, the
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 37 – Configuration > Port Mirroring
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