ECIS4500 series Web Management Guide R02

Enabled: 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. And the DHCP broadcast

message won't be flooded for security considerations.

Disabled: 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 as "[vlan_id][module_id][port_no]". The first four characters represent the

VLAN ID, the fifth and sixth characters are the module ID(in standalone device it

always equal 0, in stackable device it means switch ID), and the last two characters

are the port number. For example, "00030108" means the DHCP message receive

form VLAN ID 3, switch ID 1, port No 8. And the option 82 remote ID value is equal 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 package when a DHCP message that already contains relay

information is received.

Buttons

Click to save changes.

Click to undo any changes made locally and revert to previously saved values.