I've just had a similar issue with my CSS610-8G-2S+ except I maybe discovered the cause ?? When setting up the switch, I had the device powered on and upon inserting the 10G SFP+ transceiver, the switch restarted. Seemed almost like a short or something. Switch rebooted and everything appeared to be well. However, I had no connectivity via the trunk SFP+ port (SFP+ 1 in my case) and the switch was inaccessible unless I connected it to my router via a trunk ether port. After doing all sorts of things to troubleshoot, I decided to just blow away my configuration and try again. To my surprise, this time the SFP+ worked as expected. I then decided to put another SPF+ module in the switch (SFP+ 2) and this yet again caused the switch to reboot. Yet again, access to the switch was lost via trunk SFP+1.
I am still trying to work out the actual solution to the problem, but I so far suspect that one of the two works:
1. Make a backup of a known working configuration and restore it to the switch should this issue occur.
2. Remove the SPF+ transceiver, power cycle the switch, and insert the transceiver only once the switch is back up and running.
I unfortunately need to wait for some down time in order to test these ideas out, unless someone else wants to try first. Should this issue occur again, I will also make a backup of the config (post reboot) so that I can compare the working config (.bin file) to the one that is not working. For now, I'm happy to at least have the switch working as I need it to.
Has anyone else experienced the spontaneous rebooting when inserting an SFP module? What odd is that this doesn't always happen. I'm able to insert/remove, etc the SFP+ module in most every instance. Only sometimes does the reboot occur. Can't figure out for the life of me what would cause this.