# BPDU Skewing

Device>Configure>Spanning Tree>BPDU Skewing

BPDU skewing detection applies to all of the Catalyst platforms (Catalyst 4000, Catalyst 5000 and Catalyst 6000).

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

- Instance

- Port Index

- Skewing Last Skew Duration

- Skew Worst Skew Duration

- Skewing Worst Skew Time

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

- Click OK to continue.

- Click Apply to make changes take effect.

- Click Cancel to close the dialog box.

- Click Refresh to reload the dialog box.

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

- Click Help to access the online help.

Instance (StpxBpduSkewingInstanceIndex)

Spanning Tree instance ID.

Port Index (stpxBpduSkewingPortIndex)

Value of dot1dBasePort (i.e. dot1dBridge.1.4) for the bridge port.

Skewing Last Skew Duration (stpxBpduSkewingLastSkewDuration)

Indicates the skew duration in milliseconds of the last BPDU skewing detected.

Skew Worst Skew Duration (stpxBpduSkewingWorstSkewDuration)

Indicates the skew duration in milliseconds of the worst BPDU skewing detected.

Skewing Worst Skew Time (stpxBpduSkewingWorstSkewTime)

Indicates the value of sysUpTime when the worst BPDU skewing was detected.