ZyXEL Communications XGS-4528F, Руководство пользователя, Страница: 447 / 491

XGS-4526/4528F/4728F User’s Guide
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H A P T E R
5 1
IP Table
This chapter introduces the IP table.
51.1 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.