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shutdown-on-
violation
(OPTIONAL) Enter the keywords shutdown-on-violation
to hardware disable an interface when a BPDU is received
and the port is disabled.
priority priority Enter keyword priority then a value in increments of 16 as
the priority. The range is from 0 to 240. The default is
128.
loopguard Enter the keyword loopguard to enable loop guard on an
RSTP port or port-channel interface.
rootguard Enter the keyword rootguard to enable root guard on an
RSTP 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
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.4.2.1 Added support for the optional guard keyword on the C-
Series, S-Series, and E-Series TeraScale.
8.3.7.0 Introduced on the S4810.
8.2.1.0 Introduced the hardware shutdown-on-violation
options.
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 on the E-Series.
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 an 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 an RSTP switch, immediately
transitions to the Forwarding state. Only configure ports connected to end-
hosts as edge ports. Consider an edge port similar to a port with a spanning-
tree portfast enabled.
Rapid Spanning Tree Protocol (RSTP)
1589