Configures the DHCP options returned as part of the DHCP response by a switch configured as a DHCP server.
| vlan_name | Specifies the VLAN on which to configure DHCP. |
| code | Specifies the generic DHCP option code. |
| option_number | Specifies the DHCP Option number. |
| 16-bit | Specifies that one to four 16-bit unsigned integer values associated with selected DHCP option. |
| 32-bit | Specifies that one to four 32-bit unsigned integer values associated with selected DHCP option. |
| flag | Specifies that 1 byte value associated with selected DHCP option number. |
| hex | Specifies that hexadecimal string associated with selected DHCP option number. |
| string | Specifies that a string is associated with selected DHCP option number. |
| string_value | The string value associated with specified option. |
| default-gateway | Specifies the router option. |
| dns-server | Specifies the Domain Name Server (DNS) option. |
| primary | Specifies the primary DNS option. |
| secondary | Specifies the secondary DNS option. |
| wins-server | Specifies the NetBIOS name server (NBNS) option. |
| ipaddress | The IP address associated with the specified option. |
N/A.
This command configures the DHCP options that can be returned to the DHCP client. For the default-gateway option you are only allowed to configure an IP address that is in the VLAN's network range. For the other options, any IP address is allowed.
default-gateway—Router option, number 3.
dns-server—Domain Name Server option, number 6.
wins-server—NetBIOS over TCP/IP Name Server option, number 44.
The following command configures the DHCP server to return the IP address 10.10.20.8 as the router option:
configure vlan <name> dhcp-options default-gateway 10.10.20.8
This command was first available in ExtremeXOS 11.0.
The primary and secondary DNS options were added in ExtremeXOS 12.1.
This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X690, and X695 series switches.