Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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spanning-tree pvst

Configure a PVST+ interface with one of these settings: edge port with optional bridge port data unit (BPDU) guard, port disablement if an error condition occurs, port priority or cost for a VLAN range, loop guard, or root guard.

Syntax

spanning-tree pvst {edge-port [bpduguard [shutdown-on-violation]] | bpdufilter] | err-disable | vlan vlan-range {cost number | priority value} | rootguard}

Parameters

edge-port	Enter the keywords `edge-port` to configure the interface as a PVST+ edge port.
bpduguard	Enter the keyword `portfast` to enable Portfast to move the interface into Forwarding mode immediately after the root fails. Enter the keyword `bpduguard` to disable the port when it receives a BPDU.
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.
bpdufilter	(OPTIONAL) Enter the keyword `bpdufilter` to stop sending and receiving BPDUs on port fast enabled ports.
err-disable	Enter the keywords `err-disable` to enable the port to be put into the error-disable state (EDS) if an error condition occurs.
vlan vlan-range	Enter the keyword `vlan` then the VLAN numbers. The range is from 1 to 4094.
cost number	Enter the keyword `cost` then the port cost value. The range is from 1 to 200000. Defaults: 10-Gigabit Ethernet interface = 2000. Port Channel interface with one 10 Gigabit Ethernet = 2000. Port Channel with two 10 Gigabit Ethernet = 1800. Port Channel with two 40 Mbps Ethernet = 600.
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.
rootguard	Enter the keyword `rootguard` to enable root guard on a PVST+ port or port-channel interface.

Defaults

Not configured.

Command Modes

INTERFACE

Supported Modes

Full—Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
8.3.16.1	Introduced on the MXL 10/40GbE Switch IO Module.

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. When BPDU guard and BPDU filter is enabled on the port, then BPDU filter takes the highest precedence.

NOTE: A port configured as an edge port, on a PVST switch, will immediately transition 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.

Example

Dell(conf-if-te-0/1)#spanning-tree pvst vlan 3 cost 18000
                                             Dell(conf-if-te-0/1)#end
                                             Dell(conf-if-te-0/1)#show config
                                             !
                                             interface TenGigabitEthernet 0/1
                                             no ip address
                                             switchport
                                             spanning-tree pvst vlan 3 cost 18000
                                             no shutdown
                                             Dell(conf-if-te-0/1)#end
                                             
                                             Dell#

Related Commands

show spanning-tree pvst — views the PVST+ configuration.