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25.5.2 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 32 on page 244) 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 125 DHCP Snooping VLAN Configure
The following table describes the labels in this 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.
Table 71 DHCP Snooping Port Configure (continued)
LABEL DESCRIPTION
Table 72 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: If DHCP is enabled and there are no trusted ports, DHCP requests will not succeed.
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 25.5 on page 199.
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 8 on page 66. You can specify the DHCP VLAN in
the DHCP Snooping Configure screen. See Section 25.5 on page 199.
