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135

MSAP2000 AAMS 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 AAMS. 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

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ZyXEL MSAP2000 Manuel d'utilisateur Page 135