Users Guide

• Port Channel with two 10 Gigabit Ethernet = 1800.
• Port Channel with two 100 Mbps Ethernet = 180000.
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 only) Enter the keyword loopguard to
enable loop guard on a PVST+ port or port-channel interface.
rootguard (C-, S-, and E-Series 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, see
the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
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, 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.
Per-VLAN Spanning Tree Plus (PVST+) 1570