ZyXEL Communications OLT2406, User Manual

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OLT2406 User’s Guide
388
C
HAPTER
48
IP Table
48.1 IP Table Overview
The IP Table screen shows how packets are forwarded or filtered across the OLT’s ports. When a device
(which may belong to a VLAN group) sends a packet which is forwarded to a port on the OLT, the IP
address of the device is shown on the OLT’s
IP Table . The IP Table also shows whether the IP address is
dynamic (learned by the OLT) or static (belonging to the OLT).
The OLT uses the IP Table to determine how to forward packets. See the following figure.
1
The OLT examines a received packet and learns the port from which this source IP address came.
2
The OLT checks to see if the packet's destination IP address matches a source IP address already
learned in the
IP Table .
• If the OLT has already learned the port for this IP address, then it forwards the packet to that port.
• If the OLT 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 OLT sends an ARP to request the
MAC address. The OLT then learns the port that replies with the MAC address.
• If the OLT 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
48.2 Viewing the IP Table
Click Management > IP Table in the navigation panel to display the following screen.