ZyXEL Communications XGS-4526 사용자 설명서

 Chapter 26 IP Source Guard

XGS-4526/4528F/4728F User’s Guide

• They appear only in the ARP Inspection screens and commands, not in the 

MAC Address Filter screens and commands.

Every port is either a trusted port or an untrusted port for ARP inspection. This 
setting is independent of the trusted/untrusted setting for DHCP snooping. You 
can also specify the maximum rate at which the Switch receives ARP packets on 
untrusted ports.

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.

The Switch can send syslog messages to the specified syslog server (

) when it forwards or discards ARP packets. The Switch can 

consolidate log messages and send log messages in batches to make this 
mechanism more efficient.

Follow these steps to configure ARP inspection on the Switch.

Configure DHCP snooping. See 

Note: It is recommended you enable DHCP snooping at least one day before you 

enable ARP inspection so that the Switch has enough time to build the binding 
table.

Enable ARP inspection on each VLAN.

Configure trusted and untrusted ports, and specify the maximum number of ARP 
packets that each port can receive per second.

Use this screen to look at the current bindings for DHCP snooping and ARP 
inspection. Bindings are used by DHCP snooping and ARP inspection to distinguish 
between authorized and unauthorized packets in the network. The Switch learns