Chapter 24 IP Source Guard

24.5.2 DHCP Snooping VLAN Configure

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 (Chapter 33 on page 259) 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 73 DHCP Snooping VLAN Configure

LABEL

DESCRIPTION

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 Section 24.5 on page 208.

 

 

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 Chapter 7 on page 77.

 

You can specify the DHCP VLAN in the DHCP Snooping Configure

 

screen. See Section 24.5 on page 208.

 

 

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.

 

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GS-4012F/4024 User’s Guide