Dhcp Relay Agent - Hirschmann RS20 Reference Manual

Advanced

8.1 DHCP Relay Agent

This dialog allows you to configure the DHCP relay agent.
 Enter the DHCP server IP address.
If one DHCP server is not available, you can enter up to 3 additional
DHCP server IP addresses so that the device can change to another
DHCP server.
 With Option 82, a DHCP relay agent which receives a DHCP request
adds an "Option 82" field to the request, as long as the request received
does not already have such a field.
When you switch the function off, the device forwards attached "Option
82" fields. Under "Type", you specify the format in which the device enters
the device recognition in the "Option 82" field by the DHCP relay agent.
The options are:
– IP address
– MAC Address (default setting)
– System name (Client ID)
– Other (freely definable ID)
Enter a freely definable character string in the "Manual Value (Type
other)" text box for the DHCP Relay Agent unique identification.
"DHCP Server Remote ID entry" shows you the value which you enter
when configuring your DHCP server. "Type display" shows the device
recognition in the selected form.

The "Circuit ID" column in the table shows you the value that you enter
when configuring your DHCP server. In addition to the port number, the
"Circuit ID" also includes the ID of the VLAN that the DHCP relay received
the DHCP query from.
Note: The VLAN ID is in the circuit ID's 4th and 5th octet. The circuit ID
displayed applies to untagged frames. If the DHCP relay receives a
VLAN-tagged frame, then it is possible that the device sends a circuit ID
that is different from the one displayed to the DHCP server.
The Network Chapter contains further information about VLAN 0.
Example of a configuration of your DHCP server:
Type: mac
224
8.1 DHCP Relay Agent
RM GUI L2E
Release 8.0 05/2013