updates the bindings database. If a client message passes filtering rules, the message is placed into the
software forwarding path, where it may be processed by the DHCP relay agent, the local DHCP server,
or forwarded as an IP packet.
To access this page, click
Switching
>
DCHP Snooping
>
Base
>
VLAN Configuration
in the navigation
menu.
Use the buttons to perform the following tasks:
•
To enable a VLAN for DHCP snooping, click
Add
and select the VLAN to administratively enable for
DHCP snooping. To select multiple VLANs,
[Ctrl]
+ click each VLAN to select.
•
To disable DHCP snooping on one or more VLANs, select each entry to delete and click
Remove
. You
must confirm the action before the entry is deleted.
Table 183: DHCP Snooping VLAN Configuration Fields
Field
Description
VLAN ID
The VLAN ID that is enabled for DHCP snooping. In the Add DHCP Snooping
VLAN Configuration window, this field lists the VLAN ID of all VLANs that exist
on the device.
DHCP Snooping Mode
The current administration mode of DHCP snooping for the VLAN. Only VLANs
that are enabled for DHCP snooping appear in the list.
Click
Refresh
to refresh the page with the most current data from the switch.
DHCP Snooping Interface Configuration
Use the DHCP Snooping Interface Configuration page to view and configure the
snooping
settings for each interface. The DHCP snooping feature processes incoming DHCP messages.
For DHCPRELEASE and DHCPDECLINE messages, the feature compares the receive interface and
VLAN with the client's interface and VLAN in the binding database. If the interfaces do not match, the
application logs the event (when logging of invalid packets is enabled) and drops the message. If MAC
address validation is globally enabled, messages that pass the initial validation are checked to verify
that the source MAC address and the DHCP client hardware address match. Where there is a mismatch,
DHCP snooping logs the event (when logging of invalid packets is enabled) and drops the packet. To
change the DHCP Snooping settings for one or more interfaces, select each entry to modify and click
Edit. The same settings are applied to all selected interfaces.
To access this page, click
Switching
>
DCHP Snooping
>
Base
>
Interface Configuration
in the
navigation menu.
Configuring Switching Information
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