configure vlan dhcp-options

configure {vlan} vlan_name dhcp-options [code option_number [16-bit value1 {value2 {value3 {value4}}} | 32-bit value1 {value2 {value3 {value4}}} | flag [on | off] | hex string_value | ipaddress ipaddress1 {ipaddress2 {ipaddress3 {ipaddress4}}} | string string_value] | default-gateway | dns-server {primary | secondary} | wins-server] ipaddress

Description

Configures the DHCP (Dynamic Host Configuration Protocol) options returned as part of the DHCP response by a switch configured as a DHCP server.

Syntax Description

`vlan_name`	Specifies the VLAN (Virtual LAN) 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.

Default

N/A.

Usage Guidelines

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.

The options below represent the following BOOTP options specified by RFC2132:

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.

Example

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

History

This command was first available in ExtremeXOS 11.0.

The primary and secondary DNS options were added in ExtremeXOS 12.1.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.

Published December 2017prev | next

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