Users Guide

● 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
DellEMC(conf-if-tf-1/1)# spanning-tree pvst vlan 3 cost 1800
DellEMC(conf-if-tf-1/1)# end
DellEMC(conf-if-tf-1/1)# show config
!
interface twentyFiveGigE 1/1
no ip address
switchport
spanning-tree pvst vlan 3 cost 18000
no shutdown
DellEMC(conf-if-tf-1/1)# end
DellEMC#
Related
Commands
● show spanning-tree pvst — views the PVST+ configuration.
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.
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 Modes INTERFACE
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.12(1.0) Introduced on the S5048F–ON.
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
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.
8.3.7.0 Introduced on the S4810.
8.2.1.0 Introduced.
Usage
Information
Some non-Dell EMC Networking systems which have hybrid ports participating in PVST+ transmit two
kinds of BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU.
1232 Per-VLAN Spanning Tree Plus (PVST+)