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Whichever one gives the best number of changing values for your traffic's flows. Often src-dst-IP works well in most cases as it handles traffic to/from hosts on the same L2 network (except between the same two hosts, for those port number help), it handles traffic to/from a host on the L2 network, and it handles traffic that transits the L2 network (e.g. router to router). An even better mix is 6500 VSS's src-dst-mixed-ip-port.
