Hi, after we replaced out old switches with Cisco SG300 there is some strange problems. We have 2 x SG300 10 port and 4 x SG300 28 port. There isnt any Vlan or anything, its static IP on them. 20-30 times a day the network loose the connection to the router/firewall, the router/firewall is a Sonicwall NSA 240 and i have tried to replace that with a new one, didnt help. When the connection to the Sonicwall is gone everything else works as normal, i have tried to move sonicwall to a new port on the Cisco switch, i have also tried to connect a dlink switch between the sonicwall and cisco, that dont help. If i dont do anything the connection is back in 1-10 min. If i restart the sonicwall its back, but i dont know if its the restart that do that. On the sonicwall i have DMZ and the computers in DMZ works okey, but they loose the connection to the LAN.
Its seems like the problem is growing with more Cisco switches in the network. I updatet to the newest firmware today and it looks like it got a litle better, but it still loose connection all the time.