D-Link TM DES-6500 manual Config dhcprelay option82 state, Config dhcprelay option82 check

xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch CLI Manual

config dhcp_relay option_82 state

Purpose	Used to configure the state of DHCP relay agent information option 82 of
	the switch.
Syntax	config dhcp_relay option_82 state [enable disable]
Description	This command is used to configure the state of DHCP relay agent
	information option 82 of the switch.
Parameters	enable - When enabled, the relay agent will insert and remove DHCP
	relay information (option 82 field) in messages between DHCP servers
	and clients. When the relay agent receives the DHCP request, it adds
	the option 82 information, and the IP address of the relay agent (if the
	relay agent is configured), to the packet. Once the option 82 information
	has been added to the packet it is sent on to the DHCP server. When
	the DHCP server receives the packet and is capable of option 82, it can
	implement policies like restricting the number of IP addresses that can
	be assigned to a single remote ID or circuit ID. Then the DHCP server
	echoes the option 82 field in the DHCP reply packet. The DHCP server
	unicasts the reply to the back to the relay agent, if the request was
	relayed to the server by the relay agent. The Switch verifies that it
	originally inserted the option 82 data. Finally, the relay agent removes
	the option 82 field and forwards the packet to the switch port that is
	connected to the DHCP client that sent the DHCP request.
	disable - If disabled the relay agent will not insert and remove DHCP
	relay information (option 82 field) in messages between DHCP servers
	and clients. In addition, the check and policy settings will have no effect.
Restrictions	Only administrator-level users can issue this command.

Example usage:

To configure DHCP relay option 82 state:

DES-6500:4#config dhcp_relay option_82 state enable

Command: config dhcp_relay option_82 state enable

Success.

DES-6500:4#

config dhcp_relay option_82 check

Purpose	Used to configure the checking mechanism of DHCP relay agent
	information option 82 of the switch.
Syntax	config dhcp_relay option_82 check [enable disable]
Description	This command is used to configure the checking mechanism of
	DHCP/BOOTP relay agent information option 82 of the Switch.
Parameters	enable – When the field is toggled to enable, the relay agent will check
	the validity of the packet’s option 82 field. If the Switch receives a packet
	that contains the option 82 field from a DHCP client, the Switch drops the
	packet because it is invalid. In packets received from DHCP servers, the
	relay agent will drop invalid messages.
	disable - When the field is toggled to disable, the relay agent will not
	check the validity of the packet’s option 82 field.
Restrictions	Only administrator-level users can issue this command.

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