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 18000
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 18000
no shutdown
Dell(conf-if-te-1/1)#end
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.
Z9500
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,
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.
Version
Description
9.2(1.0)
Introduced on the Z9500.
8.3.19.0
Introduced on the S4820T.
8.3.11.1
Introduced on the Z9000.
1466
Per-VLAN Spanning Tree Plus (PVST+)
