ZyXEL Communications Ethernet switch Betriebsanweisung PDF herunterladen (Seite 207)

Dimension ES-4024 Ethernet Switch

IP Table 31-1

This chapter introduces the IP table.

31.1 Introduction to IP Table

The IP Table screen shows how packets are forwarded or filtered across the switch’s ports. It shows what device IP

address, belonging to what VLAN group (if any) is forwarded to which port(s) and 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.

3. The switch examines a received packet and learns the port on which this source IP address came.

4. 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 31-1 IP Table Flowchart

Chapter 31

Tab l e

Is destination IP

address in the

IP table?

Forward to all ports

except the incoming one.

Is outgoing port

different from

Filter this packet. Forward to outgoing port.

No Yes

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ZyXEL Communications Ethernet switch Betriebsanweisung Seite 207