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Configuring DHCP Service DHCP Relay Configuration
User Guide 565
DHCP Relay Enable DHCP Relay globally.
DHCP Relay
Hops
Specify the DHCP relay hops.
DHCP Relay Hops defines the maximum number of hops (DHCP Relay agent) that
the DHCP packets can be relayed. If a packet’s hop count is more than the value
you set here, the packet will be dropped.
DHCP Relay
Time Threshold
Specify the threshold of the DHCP relay time. The valid values are from 0 to 65535
seconds.
DHCP relay time is the time elapsed since the client began address acquisition
or renewal process. There is a field in DHCP packets which specially records this
time, and the switch will drop the packets if the value of this field is greater than
the threshold. Value 0 means the switch will not examine this field of the DHCP
packets.
2) (Optional) In the Option 82 Config section, configure Option 82.
Option 82
Support
Select whether to enable Option 82 or not.
Enable it if you want to prevent DHCP client requests from untrusted sources, or
assign different IP addresses to clients in different groups from the same DHCP
server.
Option 82 Policy Select the operation for the switch to take when receiving DHCP packets that
include the Option 82 field.
Keep: The switch keeps the Option 82 field of the packets.
Replace: The switch replaces the Option 82 field of the packets with a new
one. The switch presets a default circuit ID and remote ID in TLV (Type, Length,
and Value) format. You can also configure the format to include Value only and
customize the Value.
Drop: The switch discards the packets that include the Option 82 field.
Format Specify the packet format for the sub-option fields of Option 82.
Normal: Indicates the fields consist of three parts: Type, Length, and Value (TLV).
Private: Indicates the fields consist of the value only.
Circuit ID
Customization
Enable or disable Circuit ID Customization. Enable it if you want to manually
configure the circuit ID. Otherwise, the switch uses the default one when inserting
Option 82 to DHCP packets.
The default circuit ID is a 4-byte value which consists of 2-byte VLAN ID and
2-byte Port ID. The VLAN ID indicates which VLAN the DHCP client belongs to,
and the Port ID indicates which port the DHCP client is connected to. For example,
if the DHCP client is connected to port 1/0/1 in VLAN 2, this field is 00:02:00:01 in
hexadecimal.
Circuit ID Enter the customized circuit ID with up to 64 characters. The circuit ID
configurations of the switch and the DHCP server should be compatible with each
other.
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