Command:

fabric switching-mode allow


Mode:

Router(config)#


Syntax:

fabric switching-mode allow {bus-mode | {truncated [{threshold [mod]}]}}
no fabric switching-mode allow {bus-mode | {truncated [threshold]}}

 

Syntax Description:

bus-mode Specifies bus-only mode.
truncated Specifies truncated mode.
threshold mod (Optional) Number of Switch Fabric Module-capable modules that are needed for truncated switching; see the "Usage Guidelines" section for additional information.

 

Command Description:

To enable truncated mode in the presence of two or more fabric-enabled switching modules, use the fabric switching-mode allow command. Use the no form of this command to disable truncated mode.

Bus 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.

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.

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.

To prevent use of nonfabric-enabled modules or to prevent fabric-enabled modules from using bus mode, enter the no fabric switching-mode allow bus-mode command.

The fabric switching-mode allow command affects switches configured with a minimum of two fabric-enabled modules.

You can enter the fabric switching-mode allow truncated command to unconditionally allow truncated mode.

You can enter the no fabric switching-mode allow truncated command to allow truncated mode if the threshold is met.

You can enter the no fabric switching-mode allow bus-mode command to prevent any module from running in bus-mode.

To return to the default truncated-mode threshold, enter the no fabric switching-mode allow truncated threshold command.

The valid value for mod is the threshold value.


Example:

This example shows how to specify truncated mode:

Router (config)# fabric switching-mode allow truncated




Misconceptions:

None


Related Commands:

fabric required

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