Chapter 28 DHCP Snooping
XGS4600 Series User’s Guide
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Figure 232 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
The following table describes the labels in this screen.
Table 126 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > 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 select an option 82 profile in the DHCP Snooping VLAN Configure screen 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.
Database 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.
Agent URL 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.
Timeout interval Enter how long (10 – 65535 seconds) the Switch tries to complete a specific update in the
DHCP snooping database before it gives up.
Write delay
interval
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.
Renew DHCP
Snooping URL
Enter the location of a DHCP snooping database, and click Renew if you want the Switch to
load it. You can use this to load dynamic bindings from a different DHCP snooping
database than the one specified in Agent URL.
When the Switch loads dynamic bindings from a DHCP snooping database, it does not
discard the current dynamic bindings first. If there is a conflict, the Switch keeps the
dynamic binding in volatile memory and updates the Binding collisions counter in the DHCP
Snooping screen.
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