ZyXEL Communications 4728F User Manual

 Chapter 26 IP Source Guard

XGS-4526/4528F/4728F User’s Guide

Use this screen to specify whether ports are trusted or untrusted ports for ARP 
inspection. You can also specify the maximum rate at which the Switch receives 
ARP packets on each untrusted port. To open this screen, click Advanced 
Application > IP Source Guard > ARP Inspection > Configure > Port.

Figure 127   ARP Inspection Port Configure

The following table describes the labels in this screen.

Table 87   ARP Inspection Port Configure

Port

This field displays the port number. If you configure the * port, the 
settings are applied to all of the ports.

Trusted State

Select whether this port is a trusted port (Trusted) or an untrusted 
port (Untrusted).

The Switch does not discard ARP packets on trusted ports for any 
reason.

The Switch discards ARP packets on untrusted ports in the following 
situations:

• The sender’s information in the ARP packet does not match any 

of the current bindings.

• The rate at which ARP packets arrive is too high. You can specify 

the maximum rate at which ARP packets can arrive on untrusted 

ports.

Limit

Rate and Burst Interval settings have no effect on trusted ports.

Rate (pps)

Specify the maximum rate (1-2048 packets per second) at which 
the Switch receives ARP packets from each port. The Switch 
discards any additional ARP packets. Enter 0 to disable this limit.