First off I am a complete newb to switching, (I'm more of MS AD, SQL Server admin) so please go easy on me. We have three SRW 2024 all linked to each other via trunk ports but one of them is not passing traffic to the others and I can't even ping it. All the switches have 2 VLANS and all the ports are configured on all three exactly the same. Switch one and two were working fine together for months and then we added switch 3. After adding switch 3 switch 2 no longer speaks to either switch 1 or 3. I've checked and double check the cabling and all is well.
We have a network management tool that pings all the switches to determine connectivity and bizarrely is has shown that in between unsuccessful pings it could successfully ping switch 2 twice over the the last night . The device is no longer however. I'm presuming that during the time it was pingable it was also communication with the other switches so what could make the switch communicate and then not?