xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
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DHCP Relay Option 82
State
Use the drop-down menu to enable or disable the DHCP Relay Agent Information
Option 82 on the Switch. The default is Disabled.
Enabled –When this field is toggled to Enabled, the relay agent will insert and
remove DHCP relay information (Option 82 field) in messages between DHCP
servers and clients. When the relay agent receives the DHCP request, it adds the
Option 82 information, and the IP address of the relay agent (if the relay agent is
configured), to the packet. Once the Option 82 information has been added to the
packet it is sent on to the DHCP server. When the DHCP server receives the
packet, if the server is capable of Option 82, it can implement policies like
restricting the number of IP addresses that can be assigned to a single remote ID
or circuit ID. Then the DHCP server echoes the Option 82 field in the DHCP reply.
The DHCP server unicasts the reply back to the relay agent if the request was
relayed to the server by the relay agent. The switch verifies that it originally inserted
the Option 82 data. Finally, the relay agent removes the Option 82 field and
forwards the packet to the switch port that connects to the DHCP client that sent
the DHCP request.
Disabled- When the field is toggled to Disabled, the relay agent will not insert and
remove DHCP relay information (Option 82 field) in messages between DHCP
servers and clients, and the check and policy settings will have no effect.
DHCP Relay Agent
Information Option 82
Check
Use the drop-down menu to enable or disable the Switch’s ability to check the
validity of the packet’s Option 82 field.
Enabled – When the field is toggled to Enabled, the relay agent will check the
validity of the packet’s Option 82 field. If the switch receives a packet that contains
the Option 82 field from a DHCP client, the switch drops the packet because it is
invalid. In packets received from DHCP servers, the relay agent will drop invalid
messages.
Disabled – When the field is toggled to Disabled, the relay agent will not check the
validity of the packet’s Option 82 field.
DHCP Relay Agent
Information Option 82
Policy
Use the drop-down menu to set the Switch’s policy for handling packets when the
DHCP Relay Agent Information Option 82 Check is set to
Disabled. The default is Replace.
Replace – The Option 82 field will be replaced if the Option 82 field already exists
in the packet received from the DHCP client.
Drop – The packet will be dropped if the Option 82 field already exists in the packet
received from the DHCP client.
Keep – The Option 82 field will be retained if the Option 82 field already exists in
the packet received from the DHCP client.
DHCP Relay Agent
Information Option 82
Remote ID
Enter the DHCP relay agent information Option 82 remote ID. Options to choose
from are:
Default - If selected, the remote ID will use the original format.
User Define - If selected, the remote ID will use a user-defined string as the remote
ID. Space characters are allowed in the string.
Vendor2 - If selected, the remote ID will use a pre-defined string as the remote ID.
Vendor3 - If selected, the remote ID will use a pre-defined string as the remote ID.
DHCP Relay Agent
Information Option 82
Circuit ID
Select the DHCP relay agent information Option 82 circuit ID used here. Options to
choose from are:
Default - If selected, the circuit ID will use the original format.
User Define - If selected, the circuit ID will use a user-defined string as the circuit
ID. Space characters are allowed in the string.
Vendor1 - If selected, the circuit ID will use a pre-defined string as the circuit ID to
communicate with Alcatel-Lucent’s server.
Vendor2 - If selected, the circuit ID will use a pre-defined string as the circuit ID.
Vendor3 - If selected, the circuit ID will use a pre-defined string as the circuit ID.
Vendor4 - If selected, the circuit ID will use a pre-defined string as the circuit ID.
Vendor5 - If selected, the circuit ID will use a pre-defined string as the circuit ID.
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