IP Configuration
IPv4 Management and Interfaces
273 Cisco Small Business 300 Series Managed Switch Administration Guide
16
STEP 1 Enable DHCP Snooping and/or DHCP Relay in the IP Configuration > DHCP >
Properties page or in the Security > DHCP Snooping > Properties page.
STEP 2 Define the interfaces on which DHCP Snooping is enabled in the IP Configuration
> DHCP > Interface Settings page.
STEP 3 Configure interfaces as trusted or untrusted in the IP Configuration > DHCP >
DHCP Snooping Interface page.
STEP 4 Optional. Add entries to the DHCP Snooping Binding database in the IP
Configuration > DHCP > DHCP Snooping Binding Database page.
DHCP Snooping/Relay
This section describes how the DHCP Relay and Snooping features are
implemented via the Web-based interface.
Properties
To configure DHCP Relay, DHCP Snooping and Option 82:
STEP 1 Click IP Configuration > IPv4 Management and Interfaces >
DHCP Snooping/Relay > Properties or Security > DHCP Snooping.
Enter the following fields:
• Option 82—Select Option 82 to insert Option 82 information into packets.
• DHCP Relay—Select to enable DHCP Relay.
• DHCP Snooping Status—Select to enable DHCP Snooping. If DHCP
Snooping is enabled, the following options can be enabled:
-
Option 82 Passthrough
—Select to leave foreign Option 82 information
when forwarding packets.
-
Verify MAC Address
—Select to verify that the source MAC address of
the Layer 2 header matches the client hardware address as appears in
the DHCP Header (part of the payload) on DHCP untrusted ports.
-
Backup Database
—Select to back up the DHCP Snooping Binding
database on the device’s flash memory.
-
Backup Database Update Interval
—Enter how often the DHCP Snooping
Binding database is to be backed up (if Backup Database is selected).
