6500 fabric switching mode question

Unanswered Question
Oct 14th, 2008

Hi,

I confused about explanation of fabric switching mode of 6500 on CCO, like below


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/swfab.html


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!

Jun



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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