ZyXEL Communications MES-2110 manual Mac, 151

20

MAC

20.1 Overview

The MAC Table screen (a MAC table is also known as a filtering database) shows how frames are forwarded or filtered across the MES-2110’s ports. It shows what device MAC address, belonging to what VLAN group (if any) is forwarded to which port(s) and whether the MAC address is dynamic (learned by the MES-2110) or static (manually entered in the Static MAC Forwarding screen).

The MES-2110 uses the MAC table to determine how to forward frames. See the following figure.

1The MES-2110 examines a received frame and learns the port on which this source MAC address came.

2The MES-2110 checks to see if the frame's destination MAC address matches a source MAC address already learned in the MAC table.

•If the MES-2110 has already learned the port for this MAC address, then it forwards the frame to that port.

•If the MES-2110 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.

MES-2110 User’s Guide

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