ZyXEL ES-4124 Manual Do Utilizador

 Chapter 24 IP Source Guard

ES-4124 User’s Guide

Use this screen to enable DHCP snooping on each VLAN and to specify whether or not the 
Switch adds DHCP relay agent option 82 information (

) to DHCP 

requests that the Switch relays to a DHCP server for each VLAN. To open this screen, click 
Advanced Application > IP Source Guard > DHCP Snooping > Configure > VLAN.

Figure 105   DHCP Snooping VLAN Configure

The following table describes the labels in this screen.

Table 74   DHCP Snooping VLAN Configure

Show VLAN

Use this section to specify the VLANs you want to manage in the section 

below.

Start VID

Enter the lowest VLAN ID you want to manage in the section below.

End VID

Enter the highest VLAN ID you want to manage in the section below.

Apply

Click this to display the specified range of VLANs in the section below.

VID

This field displays the VLAN ID of each VLAN in the range specified above. 

If you configure the * VLAN, the settings are applied to all VLANs.

Enabled

Select Yes to enable DHCP snooping on the VLAN. You still have to 

enable DHCP snooping on the Switch and specify trusted ports.

Note: The Switch will drop all DHCP requests if you enable 

DHCP snooping and there are no trusted ports.

Option82

Select this to have the Switch add the slot number, port number and VLAN 

ID to DHCP requests that it broadcasts to the DHCP VLAN, if specified, or 

VLAN. You can specify the DHCP VLAN in the DHCP Snooping 

Configure screen. See 

Information

Select this to have the Switch add the system name to DHCP requests that 

it broadcasts to the DHCP VLAN, if specified, or VLAN. You can configure 

the system name in the General Setup screen. See 

. 

You can specify the DHCP VLAN in the DHCP Snooping Configure 

screen. See 

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.