# Backbone Fast

Device > Monitor > Spanning Tree > BackboneFast

From this dialog box, you can monitor the Backbone Fast transitions recorded on this device.

To view the definition for a particular MIB variable, click the appropriate link from the following list:

- In-Inferior BPDUs (stpxBackboneFastInInferiorBPDUs)

- In RLQ Request PDUs (stpxBackboneFastInRLQRequestPDUs)

- In RLQ Response PDUs (stpxBackboneFastInRLQResponsePDUs)

- Out-RLQ Request PDUs (stpxBackboneFastOutRLQRequestPDUs)

- Out-RLQ Response PDUs (stpxBackboneFastOutRLQResponsePDUs)

The following list specifies buttons in this dialog box, as well as their function:

- To specify the refresh rate for this dialog box, select a value from the drop-down box.

- Click Start/Stop to begin/end device monitoring.

> Note: The Start/Stop toggle feature is supported by CiscoView 5.3 and later.

- Click Cancel to close the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access online help.

In-Inferior BPDUs (stpxBackboneFastInInferiorBPDUs)

Number of inferior BPDUs received by the switch.

In RLQ Request PDUs (stpxBackboneFastInRLQRequestPDUs)

Number of Root Link Query request PDUs received by the switch.

In RLQ Response PDUs (stpxBackboneFastInRLQResponsePDUs)

Number of Root Link Query response PDUs received by the switch.

Out-RLQ Request PDUs (stpxBackboneFastOutRLQRequestPDUs)

Number of Root Link Query request PDUs transmitted by the switch.

Out-RLQ Response PDUs (stpxBackboneFastOutRLQResponsePDUs)

Number of Root Link Query response PDUs transmitted by the switch.