Configuring DHCP Service DHCP L2 Relay Configuration
Configuration Guide
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3.1.1 Configuring Option 82 for Ports
Choose the menu L3 FEATURES > DHCP Service > DHCP L2 Relay > Port Config to load
the following page.
Figure 3-1 Configure Option 82 for Ports
Follow these steps to enable DHCP Relay and configure Option 82:
1) Select one or more ports to configure Option 82.
Option 82
Support
Select whether to enable Option 82 or not. By default, it is disabled. Option 82 is
used to record the DHCP client’s location, Ethernet port and the VLAN, etc. If you
need to record the accurate location of a client, you can enable Option 82 on the
relay device which is closest to the client.
Option 82 Policy Select the operation for the Option 82 field of the DHCP request packets.
Keep: Indicates keeping the Option 82 field of the packets.
Replace: Indicates replacing the Option 82 field of the packets with the switch
defined one. By default, the Circuit ID is defined to be the VLAN and the ID of the
port which receives the DHCP Request packets. The Remote ID is defined to be
the MAC address of the DHCP Relay device which receives the DHCP Request
packets.
Drop: Indicates discarding the packets that include the Option 82 field.
Format Select the format of option 82 sub-option value field.
Normal: Indicates that the format of sub-option value field is TLV (type-length-
value).
Private: Indicates that the format of sub-option value field is just value.
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