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MSAP2000 AAM User’s Guide
C HAPTER 22
MAC Table
This chapter introduces the MAC Table screen.
22.1 Introduction to MAC Table
The MAC table lists device MAC addresses that are dynamically learned by the
MSAP2000 AAM. The table shows the following for each MAC address: the port
upon which Ethernet frames were received from the device, to which VLAN
groups the device belongs (if any) and to which channel it is connected (for
devices connected to DSL ports).
The switch uses the MAC table to determine how to forward frames. See the
following figure.
1 The switch examines a received frame and learns the port on which this
source MAC
address came.
2 The switch checks to see if the frame's destination MAC address matches a
source 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.
Figure 69 MAC Table Filtering Flowchart