STP blocking

[BobGreer65666]

Hi there, 

Thanks for reading.

I have SG220 switches which are cycling through blocking, learning & forwarding.  We've gone through the building and removed mini switches but the problem continues.  Here's what it's logging (and it repeats throughout the day):

2	Jun 09 2020 07:06:40	info	FastEthernet19 STP port state is set to Forwarding
3	Jun 09 2020 07:06:25	info	FastEthernet19 STP port state is set to Learning
4	Jun 09 2020 07:06:05	info	FastEthernet19 STP port state is set to Blocking
5	Jun 09 2020 07:06:05	notice	FastEthernet19 link up
6	Jun 09 2020 07:06:03	info	FastEthernet19 STP port state is set to Disabled
7	Jun 09 2020 07:06:03	notice	FastEthernet19 link down

Maybe just enabling BPDU guard?  It's just odd because we removed desktop switches.

Anyway, thanks again for reading!

Bob

[balaji.bandi]

First, you need to investigate is there any L2 Loops in the network, start from Port 19 which as mentioned in the network.

Once it is confirmed there are no Loops. make a small network diagram, is there ay connection to going to other switches.

then based on the network take a call to enable the feature required :

here is document :

https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-small-business-200-series-smart-switches/smb81-setup-spanning-tree-protocol-stp-on-a-interface-on-the-200-3.html