H3C Technologies H3C S10500 Series Switches - Manual (Page 43)

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Vendor-specific option (Option 43)
DHCP servers and clients use Option 43 to exchange vendor-specific configuration information.
The DHCP client can obtain the following information through Option 43:
• Auto-Configuration Server (ACS) parameters, including the ACS URL, username, and password.
• Service provider identifier, which is acquired by the Customer Premises Equipment (CPE) from the
DHCP server and sent to the ACS for selecting vender-specific configurations and parameters.
• Preboot Execution Environment (PXE) server address, which is used to obtain the bootfile or other
control information from the PXE server.
1. Format of Option 43
Figure 20 Format of Option 43
Network configuration parameters are carried in different sub-options of Option 43 as shown in Figure
20 .
• Sub-option type: Type of a sub-option. The field value can be 0x01, 0x02, or 0x80.
{
0x01 indicates an ACS parameter sub-option.
{
0x02 indicates a service provider identifier sub-option.
{
0x80 indicates 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 Figure 21 , the value field of the ACS parameter sub-option contains the following
variables separated by spaces (0x20):
{
ACS URL,
{
ACS username
{
ACS password
Figure 21 Format of the value field of the ACS parameter sub-option
• The value field of the service provider identifier sub-option contains the service provider identifier.
• Figure 22 shows the format of the value field of the PXE server address sub-option. The value of the
PXE server type can only be 0. The server number field indicates the number of PXE servers