Cisco 500 Series Administration Manual page 365

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STEP 1
STEP 2
STEP 3
STEP 4
STEP 1
363
Enable DHCP Snooping and/or DHCP Relay in the IP Configuration > DHCP >
Properties page or in the Security > DHCP Snooping > Properties page.
Define the interfaces on which DHCP Snooping is enabled in the IP Configuration
> DHCP > Interface Settings page.
Configure interfaces as trusted or untrusted in the IP Configuration > DHCP >
DHCP Snooping Interface page.
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:
Click IP Configuration > IPv4 Management and Interfaces >DHCP Snooping/
Relay > Properties
or click 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 Pass Through
-
when forwarding packets.
Verify MAC Address
-
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
-
database on the device's flash memory.
Backup Database Update Interval
-
Binding database is to be backed up (if Backup Database is selected).
—Select to leave foreign Option 82 information
—Select to verify that the source MAC address of
—Select to back up the DHCP Snooping Binding
—Enter how often the DHCP Snooping
Cisco 500 Series Managed Switch Administration Guide
IP Configuration
IPv4 Management and Interfaces