Accton Technology ES4710BD manual Dhcp Relay Configuration Command Ip forward-protocol udp

ES4710BD 10 Slots L2/L3/L4 Chassis Switch

4. Disable DHCP relay from forwarding DHCP broadcast packet.

Command	Explanation
Global Mode
	When layer 3 switches are used as DHCP relays,
ip dhcp relay information policy drop	this command sets the relay forwarding policy to
no ip dhcp relay information policy	drop DHCP packets; the “no ip dhcp relay
drop	information policy drop” command allows
	DHCP packets forwarding.

14.3.2DHCP Relay Configuration Command

14.3.2.1ip forward-protocol udp

Command: ip forward-protocol udp <port> no ip forward-protocol udp <port>

Function: Sets DHCP relay to forward UPD broadcast packets on the port; the “no ip forward-protocol udp <port>” command cancels the service.

Default: DHCP relay forwards DHCP broadcast packet to UDP port 67 by default.

Command mode: Global Mode

Usage Guide: The forwarding destination address is set in the “ip helper-address” command and described later.

Example: Setting TFTP packets to be forwarded to 192.168.1.5. Switch(Config)#ip forward-protocol udp 69 Switch(Config)#interface vlan 1 Switch(Config-If-Vlan1)#ip helper-address 192.168.1.5

14.3.2.2ip helper-address

Command: ip helper-address <ip-address>no ip helper-address <ip-address>

Function: Specifies the destination address for the DHCP relay to forward UDP packets. The “no ip helper-address<ip-address>” command cancels the setting.

Default: Address for forwarding DHCP broadcast packet is set on DHCP relay by default.

Command mode: Interface Mode

Usage Guide: The DHCP relay forwarding server address corresponds to the port forwarding UDP, i.e., DHCP relay forwards corresponding UDP packets only to the corresponding server instead of all UDP packets to all servers. The default setting of DHCP relay is to forward DHCP packets on UDP port 67 to the DHCP server. When this command is run after “ip forward-protocol udp <port>” command, the forwarding address configured by this command receives the UDP packets from <port> instead of default DHCP packets. If a different set of UDP forwarding protocol and receiving server address is to be set, the combination of “ip forward-protocol udp <port>” command and this command should be used for configuration.

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