
Chapter 48 MAC Table
IES-1248-51V User’s Guide
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1 The device examines a received frame and learns the port on which this source
MAC address came.
2 The device checks to see if the frame's destination MAC address matches a source
MAC address already learned in the MAC table.
• If the device has already learned the port for this MAC address, then it forwards
the frame to that port.
• If the device 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 device 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.
48.2 MAC Table Screen
To open this screen, click Management > MAC Table.
Figure 167 MAC Table
The following table describes the labels in this screen.
Table 126 MAC Table
LABEL DESCRIPTION
Show port Select a port for which to display learned MAC addresses (or display
all of them).
Index This is the number of the MAC table entry.
Port This is the port to which the MAC address is associated.
MAC This is the MAC address of the device from which this incoming frame
came.
VID
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