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Routing Configuration 103
Example 5: Enable IP Helper on a VLAN Routing Interface to a Server (DHCP and DNS)
To relay DHCP and DNS packets to 192.168.30.1, use the following commands:
console(config-if-vlan100)#ip helper-address 192.168.30.1 dhcp
console(config-if-vlan100)#ip helper-address 192.168.30.1 domain
Example 6: Enable IP Helper on Multiple VLAN Routing Interfaces
With the following configuration, the relay agent relays:
• DHCP packets received on any interface other than VLAN 200 and VLAN 300 to 192.168.40.1
• DHCP and DNS packets received on VLAN 200 to 192.168.40.2
• SNMP traps (port 162) received on interface VLAN 300 to 192.168.23.1
• Drops DHCP packets received on VLAN 300
console(config)#ip helper-address 192.168.40.1 dhcp
console(config)#interface vlan 200
console(config-if-vlan200)#ip helper-address 192.168.40.2 dhcp
console(config-if-vlan200)#ip helper-address 192.168.40.2 domain
console(config-if-vlan200)#exit
console(config)#interface vlan 300
console(config-if-vlan300)#ip helper-address 192.168.23.1 162
console(config-if-vlan300)#ip helper-address discard dhcp
console(config-if-vlan300)#exit