I confused about explanation of fabric switching mode of 6500 on CCO, like below
CCO said Dbus header is transmited on switching fabirc channel, but DBUS located on share BUS, why DBUS header transmited on switching fabirc channel.
Compact mode-The switch uses this mode for all traffic when only fabric-enabled modules are
installed. In this mode, a compact version of the DBus header is forwarded over the switch fabric
channel, which provides the best possible performance.
Truncated mode-The switch uses this mode for traffic between fabric-enabled modules when there
are both fabric-enabled and nonfabric-enabled modules installed. In this mode, the switch sends a
truncated version of the traffic (the first 64 bytes of the frame) over the switch fabric channel.
Bus mode (also called flow-through mode)-The switch uses this mode for traffic between
nonfabric-enabled modules and for traffic between a nonfabric-enabled module and a fabric-enabled
module. In this mode, all traffic passes between the local bus and the supervisor engine bus.