Our access switches consist of a 3 3750's in a stack. I created an etherchannel from the 3750 to a 6509, I used 1 fiber link from each of the 3750's to create a 3 port etherchannel. I also recently changed the port from a layer 2 connection to the 6509 to a L3 router port. Everything is working fine, then last weekend I tried changing the load balancing to src-dst-ip, and I had all sorts of connectivity problems. Some hosts worked fine, most didn't. What would be the cause of that? it works fine with the default source mac address load balancing.