Content

| 9.3 |  | Network Analysis Modules and Switch Fabric Modules |
| 9.3.7 |  | Configuring the Switch Fabric Module |

The Switch Fabric Module does not require any user configuration. A fully automated start-up sequence brings the module online and runs the connectivity diagnostics on the ports. Based on the other modules within the chassis the SFM determines which mode to operate in.

To manually configure the switching mode (supported in IOS release 12.1(11b)E and later), perform this task:

> Router(config)#[no] fabric switching-mode allow {bus-mode | {truncated [{threshold [number]}]}

The relevance of each variation of the fabric switching-mode allow command is shown in Figure .

To configure fabric-required mode, which prevents all switching modules from operating unless there is a Switch Fabric Module installed, use the following command:

> Router(config)#fabric required

This will effectively turn off all modules except the supervisor engine if no SFM is installed.

Use the no fabric required command to clear fabric required mode.