Etherchannel in Packet tracer problem

[antoin1984]

ALS1-MGMT(config)#int range fa0/11 - 12
ALS1-MGMT(config-if-range)#switchport mode trunk
ALS1-MGMT(config-if-range)#channel-group 1 mode desirable
^
% Invalid input detected at '^' marker.

This is what happens when I try to assign etherchannel to that range of interfaces or any for that matter, this is on a cisco 2960-24TT switch. This works on my layer 3 3560 and not on this layer 2, I'm bamboozled!
Does anyone know what I should do differently or shed some light on why etherchannel seems to be a non-existent entity to the 2960 on packet tracer?

 

[vipergg]

Take those commands out. Create the port channel

conf t
int port channel 5
switchport mode trunk
shut

int range f011 - 12
channel-group 5 mode desirable non-silent


Then do a no shut on the port channel interface itself . Do the same for each end . Also make sure you don't have more than 6 port channels on the 2960 , that is the limit for that switch . Etherchannel works fine on a 2960 , have them all over.

 

[antoin1984]

cheers, I'll try that later and let you know how I got on.