ZyXEL Communications GS-4012 - Manual (Page 208)

Chapter 24 IP Source Guard
GS-4012F/4024 User’s Guide
208
24.5 DHCP Snooping Configure
Use this screen to enable DHCP snooping on the Switch (not on specific VLAN), specify the
VLAN where the default DHCP server is located, and configure the DHCP snooping database.
The DHCP snooping database stores the current bindings on a secure, external TFTP server so
that they are still available after a restart. To open this screen, click Advanced Application >
IP Source Guard > DHCP Snooping > Configure.
Figure 103 DHCP Snooping Configure
The following table describes the labels in this screen.
Table 71 DHCP Snooping Configure
LABEL DESCRIPTION
Active Select this to enable DHCP snooping on the Switch. You still have to
enable DHCP snooping on specific VLAN and specify trusted ports.
Note: The Switch will drop all DHCP requests if you enable
DHCP snooping and there are no trusted ports.
DHCP Vlan Select a VLAN ID if you want the Switch to forward DHCP packets to
DHCP servers on a specific VLAN.
Note: You have to enable DHCP snooping on the DHCP
VLAN too.
You can enable Option82 in the DHCP Snooping VLAN Configure
screen ( Section 24.5.2 on page 211 ) to help the DHCP servers distinguish
between DHCP requests from different VLAN.
Select Disable if you do not want the Switch to forward DHCP packets to a
specific VLAN.