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priority value Enter the keyword priority then the Port priority value in
increments of 16. The range is from 0 to 240. The default is
128.
loopguard (C-, S-, and E-Series TeraScale only) Enter the keyword
loopguard to enable loop guard on a PVST+ port or port-
channel interface.
rootguard (C-, S-, and E-Series TeraScale only) Enter the keyword
rootguard to enable root guard on a PVST+ port or port-
channel interface.
Defaults Not configured.
Command
Modes
INTERFACE
Command
History
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.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.4.2.1 Introduced the loopguard and rootguard options on the
E-Series TeraScale, C-Series, and S-Series.
8.3.7.0 Introduced on the S4810.
8.2.1.0 Introduced the hardware shutdown-on-violation
option.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
7.4.1.0 Added the optional Bridge Port Data Unit (BPDU) guard.
6.2.1.1 Introduced.
Usage
Information
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.
1450
Per-VLAN Spanning Tree Plus (PVST+)