Cisco etherchannel hashing

Cisco switches don’t just look at the last x bits, they use a proprietary algorithm to do the hashing. I don’t have the liberty to provide details, however I can confirm that it’s an actual algorithm and not just “last x bits”. The following document confirms too:

http://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html