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CHAPTER 9: DHCP
FIGURE 9-4. DHCP RELAY CONFIGURATION
PARAMETER DESCRIPTION
Relay Mode: Indicates the DHCP relay mode operation.
Possible modes are:
- on: Enable DHCP relay mode operation. When DHCP relay mode operation is enabled, the agent forwards and transfers DHCP
messages between the clients and the server when they are not in the same subnet domain. The DHCP broadcast message won’t
be flooded for security considerations.
- off: Disable DHCP relay mode operation.
Relay Server: Indicates the DHCP relay server IP address.
Relay Information Mode: Indicates the DHCP relay information mode option operation. The option 82 circuit ID format is “[vlan_id]
[module_id][port_no]”. The first four characters represent the VLAN ID, the fifth and sixth characters are the module ID (in a
standalone device it always equal 0, in a stackable device it means switch ID), and the last two characters are the port number. For
example, “00030108” means the DHCP message is received from VLAN ID 3, switch ID 1, port No 8. And the option 82 remote ID value
equals the switch MAC address.
Possible modes are:
- Enabled: Enable DHCP relay information mode operation. When DHCP relay information mode operation is enabled, the agent
inserts specific information (option 82) into a DHCP message when forwarding to DHCP server and removes it from a DHCP
message when transferring to DHCP client. It only works when DHCP relay operation mode is enabled.
- Disabled: Disable DHCP relay information mode operation.
Relay Information Policy: Indicates the DHCP relay information option policy. When DHCP relay information mode operation is
enabled, if the agent receives a DHCP message that already contains relay agent information, it will enforce the policy. The “Replace”
policy is invalid when relay information mode is disabled. Possible policies are:
- Replace: Replace the original relay information when a DHCP message that already contains it is received.
- Keep: Keep the original relay information when a DHCP message that already contains it is received.
- Drop: Drop the packet when a DHCP message that already contains relay information is received.
Buttons
Apply: Click to save changes.
Reset: Click to undo any changes made locally and revert to previously saved values.
