Small business switch setup

[RussGM]

I am currently looking to deploy 8 new SG350X switches in stack mode (4 switches in each stack). These switches will be replacing 8 older HP\Aruba switches. Spanning tree is running on these switches and there are no ports with loop\root guard, TCN guard, or BPDU protected\filtered configured. 

On the new switches, I run the setup through the console, add an IP address, subnet mask, and gateway, etc. By default, all ports are access ports. No problem. 

The issue I have after I connect it to the network, is after about 5-10 minutes, I see slowness issues on the network until I unplug it. I am guessing I am seeing either a routing or bridging loop. 

I am looking to to find out what I need to set (on either switch) to prevent this.

I see this in the log and am sure it is related

WARNING %STP-W-PORTSTATUS: te1/0/2: STP status Forwarding

Any nudge in the right direction would be greatly appreciated 

[Reza Sharifi]

Not familiar with SG series switches but maybe we can help you figure it out.

 The issue I have after I connect it to the network, is after about 5-10 minutes, I see slowness issues on the network until I unplug it. I am guessing I am seeing either a routing or bridging loop.

Are you referring to when you connect each stack to the network or connecting the stacks together? Can you clarify?

WARNING %STP-W-PORTSTATUS: te1/0/2: STP status Forwarding

What does this port do? Do you have multiple ports connecting the stack together? if yes, for testing, can you just use one port and test again?

HTH

[RussGM]

At this point, It is just 1 switch as I have not stacked them yet (but I will).

Once I set the basic info, plug a network cable into port 1 (an access port), and access the GUI, I go into the logs and I see the error.

WARNING %STP-W-PORTSTATUS: te1/0/2: STP status Forwarding

Within a few minutes, the slowness starts and then ends when i unplug the network cable.

[Reza Sharifi]

WARNING %STP-W-PORTSTATUS: te1/0/2: STP status Forwarding

So, what is connected to port 1/0/2? Can you enable "portfast" on the port you plug the network cable?

Also, does this only happen with this switch?

HTH

[RussGM]

A standard Cat 6 cable is connected to Port 1/0/2. I can enable port fast, if you mean spanning-tree portfast.