ZyXEL Communications MES3500-24 User Manual

Chapter 26 IP Source Guard

MES3500-24/24F User’s Guide

Use this screen to specify whether ports are trusted or untrusted ports for DHCP snooping. 

Note: The Switch will drop all DHCP requests if you enable DHCP snooping and there are 

no trusted ports.

You can also specify the maximum number for DHCP packets that each port (trusted or untrusted) 
can receive each second. To open this screen, click Advanced Application > IP Source Guard > 
DHCP Snooping > Configure > Port.

DHCP Snooping Port Configure

Renew DHCP 

Snooping URL

Enter the location of a DHCP snooping database, and click Renew if you want the 
Switch to load it. You can use this to load dynamic bindings from a different DHCP 
snooping database than the one specified in Agent URL.

When the Switch loads dynamic bindings from a DHCP snooping database, it does not 
discard the current dynamic bindings first. If there is a conflict, the Switch keeps the 
dynamic binding in volatile memory and updates the Binding collisions counter in the 
DHCP Snooping screen (

Apply

Click Apply to save your changes to the Switch’s run-time memory. The Switch loses 
these changes if it is turned off or loses power, so use the Save link on the top 
navigation panel to save your changes to the non-volatile memory when you are done 
configuring.

Cancel

Click this to reset the values in this screen to their last-saved values.

DHCP Snooping Configure (continued)