Properties

DHCP Relay transfers DHCP packets to the DHCP server. The device can transfer DHCP messages received from VLANs that do not have IP addresses. Whenever DHCP Relay is enabled on a VLAN without an IP address, Option 82 is inserted automatically.

To set the DHCP Snooping/Relay properties, complete the following steps:

Procedure

Step 1

Click IPv4 Configuration > DHCP Snooping/Relay > Properties.

Step 2

Configure the following fields:

  • DHCP Relay—Select to enable DHCP Relay

  • DHCP Snooping Status—Select to enable DHCP Snooping.

  • Option 82 Pass Through—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.

Step 3

Click Apply. The settings are written to the Running Configuration file.

Step 4

To define a DHCP server, click Add. The Add DHCP Server dialog appears, with the IP version indicated.

Step 5

Enter the IP address of the DHCP server and click Apply. The settings are written to the Running Configuration file.