XS1930 Series User’s Guide
329
C
HAPTER
42
IP Table
42.1 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 then the Switch sends an ARP to request
the MAC address. The Switch then learns the port that replies with the MAC address.
• 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 243
IP Table Flowchart
42.2 Viewing the IP Table
Click
Management
>
IP Table
in the navigation panel to display the following screen.
