An input/output (I/O) switch fabric includes first physical ports that convey multiple network flows. Moreover, classifiers in the I/O switch fabric separate packets for network flows associated with different types of service. Then, the I/O switch fabric conveys the packets to different virtual switch ports without interference between the separated packets associated with different network flows. Furthermore, second physical ports in the I/O switch fabric output the packets, where a given second physical port outputs packets for at least some of the network flows associated with different types of service. In this way, the given second physical port can output packets having: the same source and destination; different sources and the same destination; or the same source and different destinations.