HPE 3100 Configuration Manual page 39

1. Format of Option 43
Network configuration parameters are carried in different sub-options of Option 43 as shown
in Figure
Figure 18 Option 43 format
Sub-option type—Type of a sub-option. The field value can be 0x01 (an ACS parameter sub-option),
0x02 (a service provider identifier sub-option), or 0x80 (a PXE server address sub-option).
Sub-option length—Length of a sub-option excluding the sub-option type and sub-option length
fields.
Sub-option value—Value of a sub-option. The value format varies with sub-options.
2. Format of the sub-option value field of Option 43
As shown in
ACS URL, ACS username, and ACS password separated by spaces (0x20):
Figure 19 ACS parameter sub-option value field
The value field of the service provider identifier sub-option contains the service provider
identifier.
Figure 20
value of the PXE server type can only be 0. The server number field indicates the number of
PXE servers contained in the sub-option. The server IP addresses field contains the IP
addresses of the PXE servers.
Figure 20 PXE server address sub-option value field
Relay agent option (Option 82)
Option 82 is the relay agent option in the option field of the DHCP message. It records the location
information about the DHCP client. When a DHCP relay agent or DHCP snooping device receives a
client's request, it adds Option 82 to the request message and sends it to the server.
The administrator can locate the DHCP client to further implement security control and accounting.
The Option 82 supporting server can also use such information to define individual assignment
policies of IP address and other parameters for the clients.
18.
Figure 19, the value field of the ACS parameter sub-option contains variable
shows the format of the value field of the PXE server address sub-option. The
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