I'm having some weird troubles with our smb network. There isn't any documentation about the structure/devices or which cable is attached to which wall socked and I'm discovering lots of weird stuff. I've already removed 3 network loops and set up 3 of the 5 switches as managed and enabled STP but the weird behaviour still exists: All activity lights of all switches are flashing in exactly the same rate which makes me think there must be another loop or hub in the network. Another issue is that one of the new HP V1910 switches is logging the following exactly every 2 seconds (This makes me think of the STP hello timer interval):
Instance 0's port GigabitEthernet1/0/1 was notified of a topology change.
GE1/0/1 is connected to our backbone switch, which isn't managed. So I can't figure out what's going wrong. I also can't replace it (not new or temporarily).
What would be a good approach find the cause of these issues?