Dell 9.7(0.0) Spanning-tree pvst err-disable, Dellconf-if-te-1/1#spanning-tree pvst vlan 3 cost

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.

Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a Blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and loop guard are both configured:

•If a BPDU is received from a remote device, BPDU guard places the port in an Err-Disabled Blocking state and no traffic is forwarded on the port.

•If no BPDU is received from a remote device, loop guard places the port in a Loop-Inconsistent Blocking state and no traffic is forwarded on the port.

Example	Dell(conf-if-te-1/1)#spanning-tree pvst vlan 3 cost 1800
	Dell(conf-if-te-1/1)#end
	Dell(conf-if-te-1/1)#show config
	!
	interface TenGigabitEthernet 1/1
	no ip address
	switchport
	spanning-tree pvst vlan 3 cost 1800
	no shutdown
	Dell(conf-if-te-1/1)#end
	Dell#
Related	show spanning-tree pvst — views the PVST+ configuration.
Commands

spanning-tree pvst err-disable

Place ports in an Err-Disabled state if they receive a PVST+ BPDU when they are members an untagged VLAN.

S6000

Syntax	spanning-tree pvst err-disable cause invalid-pvst-bpdu
Defaults	Enabled; ports are placed in the Err-Disabled state if they receive a PVST+ BPDU
	when they are members of an untagged VLAN.
Command	INTERFACE
Modes
Command	This guide is platform-specific. For command information about other platforms,
History	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.

VersionDescription

9.7(0.0) Introduced on the S6000-ON.

1238 Per-VLAN Spanning Tree Plus (PVST+)