ZyXEL Communications XGS2210-28 User Manual page 270

Figure 200 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
The following table describes the labels in this screen.
Table 111 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
LABEL
Active
DHCP Vlan
Database
Agent URL
Timeout interval
Write delay interval
Chapter 26 IP Source Guard
DESCRIPTION
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 Option82 in the DHCP Snooping VLAN Configure screen
on page 273) 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.
If Timeout interval is greater than Write delay interval, it is possible that the next update
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://{domain name or IP address}/directory, if applicable/file name; for
example, tftp://192.168.10.1/database.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.
XGS2210 Series User's Guide
270
(Section 26.6.2