So the setup first. I've got MikroTik rb3011 as my gateway with one WAN and other ports in bridge. On the MT bridge I’ve got two switches.
- one is cisco sg300
- and for the building nearby there is optical fiber with media converters connecting MT and two chained switches TP link tl-sg1024d.
Cisco is root bridge.
Problem is that, at least once a day the network on those unmanaged switches completely fails. Which means that if you run wireshark on any clients there is no traffic whatsoever from the rest of the network, including L2. Also on MT Rx on particular interface shows 0 bps. All lights on TP link are green indicating all OK.
What we done so far is check for any loops and there is none, at least we could not find it. Also we analysed traffic to check for any abnormality like arp flooding or excessive multicasting and everything looks OK. I've hit the wall and don't know what more to check. Any idea would be greatly appreciated.
Edit: Just for clarification, everything on cisco is working fine.