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846 | Per-VLAN Spanning Tree Plus
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Displaying STP Guard Configuration
To verify the STP guard configured on PVST interfaces, enter the show spanning-tree pvst [vlan vlan-id]
guard
command. Refer to Chapter 52, “Spanning Tree Protocol,” on page 1049 for information on how to
configure and use the STP root guard, loop guard, and BPDU guard features.
Figure 40-6 shows an example for VLAN 5 in a PVST network in which:
• Root guard is enabled on a port that is in a root-inconsistent state.
• Loop guard is enabled on a port that is in a forwarding state.
• BPDU guard is enabled on a port that is shut down.
Figure 40-6. Displaying STP Guard Configuration
Task Command Syntax Command Mode
Augment the Bridge ID with the VLAN ID.
extend system-id
PROTOCOL PVST
FTOS(conf-pvst)#do show spanning-tree pvst vlan 5 brief
VLAN 5
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32773, Address 0001.e832.73f7
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32773 (priority 32768 sys-id-ext 5), Address 0001.e832.73f7
We are the root of Vlan 5
Configured hello time 2, max age 20, forward delay 15
...
FTOS#show spanning-tree pvst vlan 5 guard
Interface
Name Instance Sts Guard type
--------- -------- --------- ----------
Gi 0/1 5 INCON(Root) Root
Gi 0/2 5 FWD Loop
Gi 0/3 5 EDS(shut) Bpdu