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DELL PC6224F User Manual

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IP Helper Commands
715
Default Configuration
No helper addresses are configured.
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