Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 138

Configuring Device Security Defining DHCP Snooping 4 - Unchecked - Disables DHCP Snooping on the device. This is the default value. • Option 82 Passthrough - Indicates if the device forwards or rejects packets that include Option 82 information, while DHCP Snooping is enabled. - Checked - Device forwards packets containing Option 82 information. - Unchecked - Device rejects packets containing Option 82 information. • Verify MAC Address - Indicates if the MAC address is verified. The possible field values are: - Checked - Verifies (on an untrusted port) 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). - Unchecked - Disables verifying that the source MAC address of the Layer 2 header matches the client hardware address as appears in the DHCP Header. This is the default value. • Backup Database - Indicates if the DHCP Snooping Database learning and update is enabled. All changes to the binding storage file are implemented only if the device's system clock is synchronized with the SNTP Server. The possible field values are: - Checked - Enables backing up of the allotted IP address in the DHCP Snooping Database. - Unchecked - Disables backing up to the allotted IP address in the DHCP Snooping Database. This is the default value. • Database Update Interval - Indicates how often the DHCP Snooping Database is backed up. The possible field range is 600 - 86400 seconds. The field default is 1200 seconds. STEP 2 Modify the relevant fields. STEP 3 Click Apply. The settings are defined, and the device is updated. Defining DHCP Snooping on VLANs The DHCP Snooping VLAN Settings Page allows network managers to enable DHCP snooping on VLANs. To enable DHCP Snooping on a VLAN, ensure DHCP Snooping is enabled on the device. Cisco Small Business SFE/SGE Managed Switches Administration Guide 129