Hello Stefano,
by default traffic is load balanced based on :
an exor or MAC SA and MAC DA for non ipv4-traffic
an exor of IP SA and IP DA for ipv4 traffic.
this may be enough for your needs or not depending on traffic patterns.
the important note is that the two devices at the two ends of an etherchannel don't need to use the same load balancing algorithm.
so if necessary you can tune algorithm on a per device basis.
the choice is system wide not per bundle.
Hope to help
Giuseppe
