This happens for 1 of 2 reeasons.1: The physical port negotiated half-duplex (does not apply here due to configured duplex). 2: The connected device is not sending it's LACP due to a configuration error or no LACP support. SolutionsConfigure the Nexu...
http://www.cisco.com/en/US/customer/products/hw/vpndevc/ps2030/products_configuration_example09186a00808c9a87.shtmlI think this document will help you.
I don't know of any guides and i did just search and couldnt find any.I would suggest removing the "eq ftp" from the crypto ACL on ASA 5540-A. That may resolve your issue. The access lists on both sides have to match up and i dont think the "eq ftp...