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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 4 Configuring a Supervisor Engine 720
Configuring and Monitoring the Switch Fabric Functionality
Configuring the Switch Fabric Functionality
To configure the switching mode, perform this task:
When configuring the switching mode, note the following information:
• To allow use of nonfabric-enabled modules or to allow fabric-enabled modules to use bus mode,
enter the fabric switching-mode allow bus-mode command.
• 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.
Caution When you enter the no fabric switching-mode allow bus-mode command, power is removed from any
nonfabric-enabled modules installed in the router.
• To allow fabric-enabled modules to use truncated mode, enter the fabric switching-mode allow
truncated command.
• To prevent fabric-enabled modules from using truncated mode, enter the no fabric switching-mode
allow truncated command.
• To configure how many fabric-enabled modules must be installed before they use truncated mode
instead of bus mode, enter the fabric switching-mode allow truncated threshold number command.
• To return to the default truncated-mode threshold, enter the no fabric switching-mode allow
truncated threshold command.
Monitoring the Switch Fabric Functionality
The switch fabric functionality supports a number of show commands for monitoring purposes. A fully
automated startup sequence brings the module online and runs the connectivity diagnostics on the ports.
Table 4-1 Switch Fabric Functionality Switching Modes
Modules Switching Modes
Between fabric-enabled modules (when no nonfabric-enabled modules are
installed)
Compact
1
1. In show commands, displayed as dcef mode for fabric-enabled modules with DFC3 installed; displayed as fabric mode for
other fabric-enabled modules.
Between fabric-enabled modules (when nonfabric-enabled modules are also
installed)
Truncated
2
2. Displayed as fabric mode in show commands.
Between fabric-enabled and nonfabric-enabled modules Bus
Between non-fabric-enabled modules Bus
Command Purpose
Router(config)# [no] fabric switching-mode allow
{bus-mode | {truncated [{threshold [
number
]}]}
Configures the switching mode.
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