Dell 9.7(0.0) manual 1237

Defaults

Command Modes

Command History

Usage Information

Not configured.

INTERFACE

This guide is platform-specific. For command information about other platforms, refer to the relevant Dell Networking OS Command Line Reference Guide.

The following is a list of the Dell Networking OS version history for this command.

Version	Description
9.7(0.0)	Introduced on the S6000-ON.

9.0.2.0Introduced on the S6000.

8.3.19.0Introduced on the S4820T.

8.3.11.1Introduced on the Z9000.

8.4.2.1Introduced the loopguard and rootguard options on the E-Series TeraScale, C-Series, and S-Series.

8.3.7.0Introduced on the S4810.

8.2.1.0Introduced the hardware shutdown-on-violationoption.

7.6.1.0Introduced on the S-Series.

7.5.1.0Introduced on the C-Series.

7.4.1.0Added the optional Bridge Port Data Unit (BPDU) guard.

6.2.1.1Introduced.

The BPDU guard option prevents the port from participating in an active STP topology in case a BPDU appears on a port unintentionally, or is misconfigured, or is subject to a DOS attack. This option places the port into the Error Disable state if a BPDU appears, and a message is logged so that the administrator can take corrective action.

NOTE: A port configured as an edge port, on a PVST switch, immediately transitions to the forwarding state. Only ports connected to end-hosts should be configured as an edge port. Consider an edge port similar to a port with a spanning-tree portfast enabled.

If you do not enable shutdown-on-violation, BPDUs are still sent to the route process module (RPM) CPU.

You cannot enable root guard and loop guard at the same time on a port. For example, if you configure loop guard on a port on which root guard is already configured, the following error message is displayed: % Error: RootGuard is configured. Cannot configure LoopGuard.

Per-VLAN Spanning Tree Plus (PVST+) 1237