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6500 fabric switching mode question


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.

thank you!


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.

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