Cisco 500 Series Administration Manual page 375

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DHCP Options
When the device is acting as a DHCP server, the DHCP options can be configured
using the HEX option. A description of these options can be found in RFC2131.
The configuration of these options determines the reply that is sent to DHCP
clients whose packets include a request (using option 55) for the configured DHCP
options.
Example: The DHCP option 66 is configured with the name of a TFTP server in the
DHCP Options page. When a client DHCP packet is received containing option 66,
the TFTP server is returned as the value of option 66.
To configure one or more DHCP options:
Click IP Configuration > IPv4 Management and Interfaces > DHCP Server > DHCP
Options.
The previously-configured DHCP options are displayed..
To configure an option that has not been configured yet and enter the field:
• DHCP Server Pool Name equals to—Select one of the pool of network
addresses defined in the Network Pools page.
Click Add and enter the fields:
• Code— Enter the DHCP option code.
• Type— The radio buttons for this field, change according to the type of the
DHCP option's parameter. Select one of the following codes and enter the
value for the DHCP options parameter:
- Hex—Select if you want to enter the hex value of the parameter for the
DHCP option. A hex value can be provided in place of any other type of
value. For instance, you can provide a hex value of an IP address instead
of the IP address itself.
No validation is made of the hex value, therefore if you enter a HEX value,
which represents an illegal value, no error is provided, and the client
might not be able to handle the DHCP packet from the server.
- IP—Select if you want to enter an IP address when this is relevant for the
DHCP option selected.
- IP List—Enter list of IP addresses separated by commas.
- Integer—Select if you want to enter an integer value of the parameter for
the DHCP option selected.
Cisco 500 Series Managed Switch Administration Guide
IP Configuration
DHCP Server