cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

736
Views
0
Helpful
2
Replies
Highlighted
Beginner

MST: %SPANTREE-SP-2-PVSTSIM_FAIL: Spanning Tree Error/Failure

Hi,

I have two core switches in a single MST domain. These are connected to several other third party "spokeL2 switches which run PVST.

There are no loops.

I have just seen this error which causes a blocked port for 6 mins.

Core Switch 1
%SPANTREE-SP-2-PVSTSIM_FAIL: Superior PVST BPDU received on VLAN 83 port Gi2/1, claiming root 4096:e45d.523c.8322. Invoking root guard to block the port
%SPANTREE-SP-2-PVSTSIM_FAIL: Superior PVST BPDU received on VLAN 50 port Gi1/6, claiming root 4096:e45d.523c.8322. Invoking root guard to block the port


Core Switch 2
%SPANTREE-SP-2-PVSTSIM_FAIL: Superior PVST BPDU received on VLAN 50 port Gi1/32, claiming root 4096:e45d.523c.8322. Invoking root guard to block the port

I am totally confused why I am seeing the same MAC address claiming a root from three totally different ports and totally different third party switches.

Any idea ?

Greatly appreciated.

Thanks

Matt

2 REPLIES 2
VIP Advisor

Hi

Hi

Have you configured spanning guard root under the interfaces facing the third party switches or other access switches only, it could be a STP problem, the Third party switches could want be the root for any reason. 

If the Core switches are the roots for your VLANs, the above command should be configured during a maintenance window to avoid any impact. 

Beginner

Hi, thanks for response.

Hi, thanks for response.

no, root guard was missed by junior engineers. (arghh!)
I completely understand this would have saved us.

But I am confused why this MAC address claimed root from three different ports connected to three independent switches. That doesn't make any sense.

uhmmmm...

CreatePlease to create content
Content for Community-Ad
July's Community Spotlight Awards