Dell C9000 Series Reference Manual page 1862

shutdown-on-
violation
priority priority
loopguard
rootguard
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
9.9(0.0)
9.2(1.0)
8.3.19.0
8.3.11.1
8.4.2.1
8.3.7.0
8.2.1.0
7.6.1.0
7.5.1.0
7.4.1.0
6.2.1.1
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.
(OPTIONAL) Enter the keywords shutdown-on-violation to
hardware disable an interface when a BPDU is received and the
port is disabled.
Enter keyword priority then a value in increments of 16 as the
priority. The range is from 0 to 240. The default is 128.
Enter the keyword loopguard to enable loop guard on an RSTP
port or port-channel interface.
Enter the keyword rootguard to enable root guard on an RSTP
port or port-channel interface.
Description
Introduced on the C9010.
Introduced on the Z9500.
Introduced on the S4820T.
Introduced on the Z9000.
Added support for the optional guard keyword on the C-Series,
S-Series, and E-Series TeraScale.
Introduced on the S4810.
Introduced the hardware shutdown-on-violation options.
Introduced on the S-Series.
Introduced on the C-Series.
Added the optional bridge port data unit (BPDU) guard.
Introduced on the E-Series.
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) 1862