ZyXEL Communications GS3700 Series Guia do Utilizador descarregar pdf (Página 374)

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GS3700/XGS3700 Series User’s Guide 374

CHAPTER 47

IP Table

This chapter introduces the IP table.

47.1 IP Table Overview

The IP Table screen shows how packets are forwarded or filtered across the Switch’s ports. When

a device (which may belong to a VLAN group) sends a packet which is forwarded to a port on the

Switch, the IP address of the device is shown on the Switch’s IP Table. The IP Table also shows

whether the IP address is dynamic (learned by the Switch) or static (belonging to the Switch).

The Switch uses the IP Table to determine how to forward packets. See the following figure.

1 The Switch examines a received packet and learns the port from which this source IP address

came.

2 The Switch checks to see if the packet's destination IP address matches a source IP address already

learned in the IP Table.

• If the Switch has already learned the port for this IP address, then it forwards the packet to

that port.

• If the Switch has not already learned the port for this IP address, then the packet is flooded to

all ports. Too much port flooding leads to network congestion.

• If the Switch has already learned the port for this IP address, but the destination port is the

same as the port it came in on, then it filters the packet.

Figure 254 IP Table Flowchart

1 2 ... 369 370 371 372 373 374 375 376 377 378 379 ... 415 416

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