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Chapter 25 IP Source Guard

GS2200-24 User’s Guide

229

The following table describes the labels in this screen.

Table 68

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: If DHCP is enabled and there are no trusted ports,

DHCP requests will not succeed.

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 25.5.2 on page 231

) 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 (

Section 25.4 on page 225