ZyXEL Communications MES-2110 Guia do Utilizador descarregar pdf (Página 127)

MES-2110 User’s Guide

127

CHAPTER 18

MAC

18.1 Overview

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).

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.

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ZyXEL Communications MES-2110 Guia do Utilizador Página 127