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Configuring Switching Information 399
DHCP Snooping VLAN Configuration
The DHCP snooping application does not forward server messages because they are forwarded in
hardware.
DHCP snooping forwards valid DHCP client messages received on non-routing VLANs. The message is
forwarded on all trusted interfaces in the VLAN.
DHCP snooping can be configured on switching VLANs and routing VLANs. When a DHCP packet is
received on a routing VLAN, the DHCP snooping application applies its filtering rules and 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.
DHCP snooping is disabled globally and on all VLANs by default. Ports are untrusted by default.
To access the DHCP Snooping VLAN Configuration page, click Switching > DHCP Snooping >
VLAN Configuration in the navigation tree.
Figure 7-112. DHCP Snooping VLAN Configuration
The DHCP Snooping VLAN Configuration page contains the following fields:
•
VLAN ID
— Select the VLAN for which information to be displayed or configured for the DHCP
snooping application.
•
DHCP Snooping Mode
— Enables or disables the DHCP snooping feature on the selected VLAN.
The default is Disable.
Displaying the DHCP Snooping VLAN Summary Table
1.
Open the
DHCP Snooping VLAN Configuration
page.
2.
Click
Show All
.
The
DHCP Snooping VLAN Summary
table
displays.