Creating a multi-port trunk on Intel Modular Server with Dell Powerconnect 5224

I have an Intel Modular Server () that I'm trying to connect to a Dell Powerconnect 5224.  I've completed the configuration on the server side (per: http://www.intel.com/support/motherboards/server/sb/CS-031599.htm), but I'm having trouble on the 5224 side.

Here is the relevant part of my 5224 configuration:

spanning-tree mode rstp
interface range ethernet g(1-20)
spanning-tree portfast
exit
interface port-channel 3
spanning-tree guard root
exit
interface range ethernet g(1-20)
spanning-tree guard root
exit
interface port-channel 3
description LAG-to-Intel02SW02
exit
interface port-channel 3
switchport mode trunk
exit
vlan database
vlan 10,20,80,90,200
exit
interface range port-channel (1-3)
switchport trunk allowed vlan add 10
exit
interface range port-channel (1-3)
switchport trunk allowed vlan add 20
exit
interface range port-channel (1-3)
switchport trunk allowed vlan add 80
exit
interface range port-channel (1-3)
switchport trunk allowed vlan add 90
exit
interface range port-channel (1-3)
switchport trunk allowed vlan add 200
exit
interface vlan 10
name ProdNet01
exit
interface vlan 20
name ProdNet02
exit
interface vlan 80
name OfficeNet
exit
interface vlan 90
name DMZNet
exit
interface vlan 200
name BackupNet
exit
interface range ethernet g(1-4)
channel-group 3 mode auto
exit

I have also followed the steps in: http://www.intel.com/support/motherboards/server/sb/CS-031599.htm which outlines the process of creating a multi-port trunk  with an external switch.

Any suggestions would be greatly appreciated.

Thanks!