ZyXEL Communications P-871H Series, Руководство пользователя

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P-871H Series User’s Guide
Chapter 9 MAC Table 57
C
H A P T E R
9
MAC Table
9.1 MAC Table Overview
The MAC Table screen (a MAC table is also known as a filtering database) shows how frames
are forwarded or filtered across the Prestige’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 Prestige) or static.
The Prestige uses the MAC table to determine how to forward frames. See the following
figure.
1
The Prestige examines a received frame and learns the port on which this source MAC
address came.
2
The Prestige checks to see if the frame's destination MAC address matches a source MAC
address already learned in the MAC table.
• If the Prestige has already learned the port for this MAC address, then
it forwards the frame to that port.
• If the Prestige 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 Prestige 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.