portfast [bpduguard [shutdown-on- viol ation]]

priority priority

Enter the keyword portfast to enable Portfast to move the interface into Forwarding mode immediately after the root fails.

Enter the optional keyword bpduguard to disable the port when it receives a BPDU.

Enter the optional keyword shutdown-on-violationto hardware disable an interface when a BPDU is received and the port is disabled.

Enter keyword priority then a number as the priority. The range is from zero (0) to 15. The default is 8.

Defaults

Command Modes

Command History

Usage Information

cost = depends on the interface type; priority = 8

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.

8.3.10.1Introduced the loopguard and rootguard options on the S4810.

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 shutdown-on-violationoption.

7.7.1.0Introduced on the S-Series.

7.5.1.0Introduced on the C-Series.

6.2.1.1Introduced on the E-Series.

If you enable portfast bpduguard on an interface and the interface receives a BPDU, the software disables the interface and sends a message stating that fact. The port is in ERR_DISABLE mode, yet appears in the show interface commands as enabled. If you do not enable shutdown-on-violation, BPDUs are still sent to the RPM CPU.

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Dell 9.7(0.0) manual Portfast bpduguard shutdown-on- viol ation Priority priority