What's the difference between mls and fast switching?
I always thought of mls as being a general reference to L3/L4 switching. I never actually configured "mls" on a Cisco device.
"Switch-A> (enable) set mls flow destination-source
Configured flow mask is set to destination"
From the way it works, it sounds exactly like fast switching: the first packet is process switched, the rest follow a flow that is written into a flow table on the L2 portion of the switch.