ZyXEL Communications GS1920v2 Series User Manual page 243

Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Fig ure 172
Configure
The following table describes the labels in this screen.
Table 103 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
L ABEL
Active
DHCP Vlan
Database
Agent URL
Timeout interval
Write delay interval
Chapter 26 IP Source Guard
DESC RIPT IO N
Select this to enable DHCP snooping on the Switch. You still have to enable DHCP
snooping on specific VLAN and specify trusted ports.
Note: If DHCP is enabled and there are no trusted ports, DHCP requests will
not succeed.
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 in the
O ptio n82
on page 245) to help the DHCP servers distinguish between DHCP requests from
different VLAN.
Select if you do not want the Switch to forward DHCP packets to a specific
Disa b le
VLAN.
If is greater than
T im e o ut inte rva l
is scheduled to occur before the current update has finished successfully or timed out.
In this case, the Switch waits to start the next update until it completes the current one.
Enter the location of the DHCP snooping database. The location should be expressed
like this:
tftp:/ / {do m a in na m e o r IP a ddre ss}/ dire c to ry, if a pplic a b le / file na m e
example,
tftp:/ / 192.168.10.1/ da ta b a se .txt
Enter how long (10-65535 seconds) the Switch tries to complete a specific update in
the DHCP snooping database before it gives up.
Enter how long (10-65535 seconds) the Switch waits to update the DHCP snooping
database the first time the current bindings change after an update. Once the next
update is scheduled, additional changes in current bindings are automatically
included in the next update.
GS1920v2 Series User's Guide
243
DHC P Sno o ping VL AN C o nfig ure
, it is possible that the next update
Write de la y inte rva l
.
screen (Section 26.6.2
; for