Chapter 31 Ip Table; Introduction To Ip Table; Figure 31-1 Ip Table Flowchart - ZyXEL Communications Dimension ES-4024 User Manual

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.
No
Forward to all ports
except the incoming one.
IP Table
Is destination IP
address in the
IP table?
No
Filter this packet.

Figure 31-1 IP Table Flowchart

Dimension ES-4024 Ethernet Switch
Chapter 31
This chapter introduces the IP table.
Yes
Is outgoing port
different from
Forward to outgoing port.
IP Table
Yes
31-1