Multiple classes of service can co-exist within a fabric.
Packetized delivery
Simultaneous exchanges: • Nodes C, D and E can send class 2 and 3 frames to each other but not to Nodes A and B while they have a class 1 exclusive connection established between themselves.
• Multiple classes can co-exist, provided there is support by the switch and throughout the fabric.
• Where devices can support more than one class of service, the device driver decides which class of service to use.