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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 46 Configuring the Switch Fabric Modules
Configuring and Monitoring the Integrated Switch Fabric and Switch Fabric Module on the Switch
To configure a fallback option for the Switch Fabric Module, perform this task in privileged mode:
This example shows how to configure a fallback option to bus-mode:
Console> (enable) set system crossbar-fallback bus-mode
System crossbar-fallback set to bus-mode.
Console> (enable)
Configuring the Switching Mode
To improve performance, you can manually specify the switching mode that the system uses. If you have
one or more non-fabric-enabled modules that are installed in the chassis, configure the switch to use
flow-through mode. If you have only the CEF256 or CEF720 modules that are installed in the chassis,
configure the switch to use compact mode.
Note Non-fabric-enabled modules do not support compact mode.
Note If there is a combination of a Supervisor Engine 720 with switch-fabric capability and CEF720 modules
in the chassis, the bus-only operation is not permitted. The system stays in truncated mode.
To configure the switch to use flow-through mode if you have the non-fabric-enabled modules installed,
perform this task:
This example shows how to configure the switch to use flow-through mode:
Console> (enable) set system switchmode allow bus-only
Console> (enable)
To configure the switch to use truncated mode when CEF256 and/or CEF720 and non-fabric-enabled
modules are installed, perform this task:
This example shows how to configure the switch to use truncated mode:
Console> (enable) set system switchmode allow truncated
Console> (enable)
Task Command
Configure a fallback option for the Switch Fabric
Module.
set system crossbar-fallback {bus-mode | none}
Task Command
Configure the switch to use flow-through mode. set system switchmode allow bus-only
Task Command
Configure the switch to use truncated mode. set system switchmode allow truncated
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