Mac Forwarding Table; Static Mac Address Forwarding - ZyXEL Communications GS1500-24P User Manual

Chapter 16 MAC Address

16.2.1 MAC Forwarding Table

The Switch uses the MAC Forwarding Table to determine how to forward
frames. See the following figure.
Figure 55 MAC Forwarding Table Flowchart
The Switch examines a received frame and learns the port on which this source
1
MAC address came.
The Switch checks to see if the frame's destination MAC address matches a source
2
MAC address already learned in the MAC table.
• If the Switch has already learned the port for this MAC address, then it forwards
the frame to that port.
• If the Switch has not already learned the port for this MAC address, then the
frame is flooded to all ports. Too much port flooding leads to network
congestion.
• If the Switch has already learned the port for this MAC address, but the
destination port is the same as the port it came in on, then it filters the frame.

16.2.2 Static MAC Address Forwarding

A static MAC address is an address that has been manually entered in the MAC
address table. When you set up static MAC address rules, you are setting static
MAC addresses for a port. This may reduce the need for broadcasting.
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GS1500-24P User's Guide