Zyxel GS2200-24 Руководство пользователя онлайн [296/332] 810932

GS2200-8/24 User’s Guide 296

CHAPTER 39

MAC Table

39.1 Overview

This chapter introduces the MAC Table screen.

The MAC Table screen (a MAC table is also known as a filtering database) shows how frames are

forwarded or filtered across the Switch’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 Switch) or static (manually entered in the Static MAC Forwarding screen).

39.1.1 What You Can Do

Use the MAC Table screen (Section 39.2 on page 297) to check whether the MAC address is

dynamic or static.

39.1.2 What You Need to Know

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.