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GS1900-24 Firmware Issues
The past two times I've updated my two switches (GS1900-24) I have noticed that if you have link aggregation turned on for Port 25 and 26 (the fiber ports), when you apply a firmware update and reboot the switches appear to do something similar to a broadcast storm and literally freeze up.
The only course of action that can be taken is to unplug one of the fiber connections and switches appear to recover. However, once you get into the configuration and look at link aggregation, the configuration no longer shows aggregation and has to be set up again.
I've also noticed at one time when I updated firmware, it even reset my user/pass information back to default. Since the 2018 firmware update, it stopped doing that and was not a problem with the 6/27/2019 firmware either.
So why does a firmware update reset link aggregation and cause these switches to literally stop responding?