Dell S3100 Command Line Reference Guide for the Series 9.100.0 - Page 1057

priority value loopguard rootguard • Port Channel with two 10 Gigabit Ethernet = 1800. • Port Channel with two 100 Mbps Ethernet = 180000. Enter the keyword priority then the Port priority value in increments of 16. The range is from 0 to 240. The default is 128. (C-, S-, and E-Series only) Enter the keyword loopguard to enable loop guard on a PVST+ port or port-channel interface. (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 9.8(2.0) 9.8(1.0) 9.8(0.0P5) 9.8(0.0P2) 9.7(0.0) 9.2(1.0) 9.0.2.0 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 Introduced on the S3100 series. Introduced on the Z9100-ON. Introduced on the S4048-ON. Introduced on the S3048-ON. Introduced on the S6000-ON. Introduced on the Z9500. Introduced on the S6000. Introduced on the S4820T. Introduced on the Z9000. Introduced the loopguard and rootguard options on the E-Series, C-Series, and SSeries. Introduced on the S4810. Introduced the hardware shutdown-on-violation option. Introduced on the S-Series. Introduced on the C-Series. Added the optional Bridge Port Data Unit (BPDU) guard. 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. NOTE: A port configured as an edge port, on a PVST switch, immediately transitions to the forwarding state. Only ports connected to end-hosts should be configured as an edge port. Consider an edge port similar to a port with a spanning-tree portfast enabled. If you do not enable shutdown-on-violation, BPDUs are still sent to the route process module (RPM) CPU. You cannot enable root guard and loop guard at the same time on a port. For example, if you configure loop guard on a port on which root guard is already configured, the following error message is displayed: % Error: RootGuard is configured. Cannot configure LoopGuard. When used in a PVST+ network, loop guard is performed per-port or per-port channel at a VLAN level. If no BPDUs are received on a VLAN interface, the port or port-channel transitions to a Loop-Inconsistent (blocking) state only for this VLAN. Per-VLAN Spanning Tree Plus (PVST+) 1057