ZyXEL Communications ZyXEL Dimension ES-2048 - Manual (Page 183)

Chapter 21 IP Source Guard
ES-2048 User’s Guide
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21.5.2 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 25 on page 209 ) 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 93 DHCP Snooping VLAN Configure
The following table describes the labels in this screen.
Table 62 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 21.5 on page 180 .
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 67 .
You can specify the DHCP VLAN in the DHCP Snooping Configure
screen. See Section 21.5 on page 180 .
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.