3Com MSR 30, MSR 50 manual Dhcp select relay, Undo dhcp select relay, Dhcp update arp

736CHAPTER 52: DHCP RELAY AGENT CONFIGURATION COMMANDS

dhcp select relay

Syntax	dhcp select relay
	undo dhcp select relay
View	Interface view
Parameter	None
Description	Use the dhcp select relay command to enable the relay agent on the current
	interface, specified or all interfaces. Upon receiving requests from an enabled
	interface, the relay agent will forward these requests to outside DHCP servers for
	IP address allocation.
	Use the undo dhcp select relay command to restore the default on interface(s).
	After DHCP is enabled, the DHCP server is enabled on an interface by default. That
	is, upon receiving a client’s request from the interface, the DHCP server allocates
	an IP address from the DHCP address pool to the client.
	When the working mode of the interface is changed from DHCP server to DHCP
	relay agent, neither the IP address leases nor the authorized ARP entries will be
	deleted. However, these ARP entries may conflict with the new static entries
	generated on the DHCP relay agent; therefore, you are recommended to delete
	the existing IP address leases when changing the interface working mode to DHCP
	relay agent.
Example	# Enable the DHCP relay agent on the interface Ethernet1/0.
	<Sysname> system-view
	[Sysname] interface ethernet 1/0
	[Sysname-Ethernet1/0] dhcp select relay

dhcp update arp

Syntax	dhcp update arp
	undo dhcp update arp
View	Interface view
Parameter	None
Description	Use the dhcp update arp command to configure the DHCP relay agent to
	support authorized ARP.
	Use the undo dhcp update arp command to restore the default.
	By default, the DHCP relay agent does not support authorized ARP.