Fast EtherChannel between Catalyst 3750 and 2821 Router

Hi Guys
I'm trying to setup a Fast EtherChannel between a cat3750-smi and a 2821 router that consists of only 2 links.
I am following instructions per TAC, but I'm getting an error along the way;
On the cat3750:
interface port-channel 1
no switchport
Command Rejected: Not a convertable port
Can anyone help???
Also... do the IP Addresses for the EtherChannel need to be the same for both port-channels? Or do I assign the switch like 192.168.1.1 and the router 192.168.1.2 ?
Thanks!
Adam

Hi Adam,
The ip address cannot be same but it should belong to same subnet. So one side 192.168.1.1 and other side 192.168.1.2 will work fine.
Its better to convert your layer 2 port as a layer port fist so what you do the port which you want to be port channel go that that interface and convert with "switchport" command
once it is a layer 3 port configure with channel group and automatically layer 3 port channel will be created and you can sssign an ip address then.
Just give a try and update if it works.
Regards,
Ankur

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Posting
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