DELL N3000 User Manual

Configuring L2 and L3 Relay Features

2 Relay DNS packets received on VLAN 10 to 192.168.40.43

console(config-if-vlan10)#ip helper-address 

console(config-if-vlan10)#exit

3 Relay SNMP traps (port 162) received on VLAN 20 to 192.168.23.1

console(config)#interface vlan 20

console(config-if-vlan20)#ip helper-address 

4 The clients on VLAN 20 have statically-configured network information, 

so the switch is configured to drop DHCP packets received on VLAN 20

console(config-if-vlan20)#ip helper-address 

console(config-if-vlan20)#exit

5 DHCP packets received from clients in any VLAN other than VLAN 10 

and VLAN 20 are relayed to 192.168.40.22.

console(config)#ip helper-address 192.168.40.22 

6 Verify the configuration.

console#show ip helper-address

IP helper is enabled

The following command is issued in Global Configuration mode, so it 

applies to all interfaces except VLAN 10 and VLAN 20. IP helper commands 

issued in Interface Configuration mode override the commands issued in 

Global Configuration Mode.

I/F

UDP Port

Discard

Hit Count

Server Address

----

-------- -----

---------

---------------

Vl10

domain

No

0

192.168.40.43

Vl10 dhcp

No

0

192.168.40.35

Vl20 dhcp

Yes

0

Vl20

162

No

0

192.168.23.1

Any

dhcp

No

0

192.168.40.22