Accton Technology ES3526XA, ES3552XA manual Dhcp Commands, Ip dhcp relay information option

4 Command Line Interface

DHCP Commands

These commands are used to configure Dynamic Host Configuration Protocol (DHCP) relay and Option 82 functions. The switch can be configured to relay DHCP client configuration requests to a DHCP server on another network and include information about the switch and its DHCP clients.

Table 4-79 DHCP Commands

Command	Function	Mode	Page
ip dhcp relay information	Enables or disables DHCP Option 82 information relay	GC	4-240
option
ip dhcp relay information	Sets the information option policy for DHCP client packets that	GC	4-241
policy	include Option 82 information
ip dhcp relay server	Specifies the IP addresses of DHCP servers to be used by the	GC	4-241
	switch’s DHCP relay agent
show ip dhcp-relay	Displays the current DHCP relay configuration	PE	4-242

ip dhcp relay information option

This command enables the DHCP Option 82 information relay for the switch. Use the no form to disable this function.

Syntax

[no] ip dhcp relay information option

Default Setting

Disabled

Command Mode

Global Configuration

Command Usage

•DHCP provides a relay mechanism for sending information about the switch and its DHCP clients to the DHCP server. Known as DHCP Option 82, it allows compatible DHCP servers to use the information when assigning IP addresses, or to set other services or policies for clients.

•When the DHCP relay Option 82 is enabled, clients can be identified by the VLAN and switch port to which they are connected rather than just their MAC address. DHCP client-server exchange messages are then forwarded directly between the server and client without having to flood them to the entire VLAN.

Example

This example enables the DHCP relay Option 82.

Console(config)#ip dhcp relay information option

Console(config)#

4-240