Hi Jouni,Thanks a mil for your response, yes I saw the original reply, but I don't understand why etherchannel was supported on ASA5500 running older software, 8.4(4), and not on newer version 9.1(2)..... Gillian

Hi Ali,Thanks a mil for getting back to me.... it must be a limitation on the ASA5550.... I will open a case with TAC.  Thanks again!Gillian

Hi Ali,I know this post is a few months old, and is answered, am just wondering how you got on with your upgrade?I was running etherchannel fine on 4GE SSM in slot 1 of ASA, using version 8.4(4). I upgraded this morning to version 9.1(2) and ethercha...