For the last couple of months we have had a Netgear GS748TPS happily communicating with our core switch via a fibre link.
After a powerdown of all our equipment it stopped working properly.
The port with the Fibre module lights up green and and flashes away to show that it is communicting with the core switch (Netgear GSM7328FS), but it is not pingable and any client plugged into the GS758TPS switch cannot contact anything else on the network.
If I remove the fibre connection and try a Cat5e connection, the switch becomes pingable and the clients attached can communicate with the rest of the network. This only happens when connecting with the Fibre.
Things we have tried:
* Factory reset the switch and set it up from scratch
* Update Firmware
* Change the switch for another brand new identical switch (we have a few at the moment as we are refreshing a lot of our equipment)
* Plugging the switch directly (with a 2m fibre patch cable) into the core switch
Whatever I try, the same thing seems to happen.....the lights flash either end to show communication, but the switch or any of the clients connected cannot communicate with the rest of the network.
If I change the fibre uplink or cat5, it works fine.
As we have changed the switch, it makes me thing that it is a setting on the GSM7328FS core switch, but I dont know what this might be as it has been working fine for the last couple of months.
Any help appreciated!