Dell PowerConnect 8024 Cli Reference Manual page 608

Command Mode
Interface Configuration (VLAN) mode.
User Guidelines
This command can be invoked multiple times on routing interface, either to specify multiple
server addresses for a given port number or to specify multiple port numbers handled by a
specific server.
The command no ip helper-address with no arguments clears all helper addresses on the
interface.
Example
To relay DHCP packets received on vlan 5 to two DHCP servers,
192.168.10.1 and 192.168.20.1, use the following commands:
console#config
console(config)#interface vlan 5
console(config-if-vlan5)#ip helper-address 192.168.10.1 dhcp
console(config-if-vlan5)#ip helper-address 192.168.20.1 dhcp
To relay both DHCP and DNS packets to 192.168.30.1, use the
following commands:
console#config
console(config)#interface vlan 5
console(config-if-vlan5)#ip helper-address 192.168.30.1 dhcp
console(config-if-vlan5)#ip helper-address 192.168.30.1 dns
This command takes precedence over an ip helper-address command
given in global configuration mode. With the following
configuration, the relay agent relays DHCP packets received on any
interface other than vlan 5 and vlan 6 to 192.168.40.1, relays DHCP
and DNS packets received on vlan 5 to 192.168.40.2, relays SNMP
traps (port 162) received on interface vlan 6 to 192.168.23.1, and
drops DHCP packets received on vlan 6:
console#config
console(config)#ip helper-address 192.168.40.1 dhcp
608
IP Helper Commands