Fortigate 7.2.10 / Fortiswitch 7.6.0
Another day, another issue with Fortiswitch…
Our monitoring system notified us of a couple of switches and access points offline at one of our managed locations today. Unfortunately, we had to investigate.
After logging into the Fortigate that manages the Fortiswitch, It showed 5 out of the 11 switches we have at this location online.
The toplogy is like this:
Fortigate –> Fortiswitch 1 –> Fortiswitch 2 –> Fortiswitch 3
Fortiswitch 1 was online, Fortiswitch 2 and 3 were not.
So, I checked the DAC cable connection from FSW2 to FSW1 annnnnnddddd its green. The Fortilink icon is no longer there and the _.default.native.vlan is showing. The MAC addresses for FSW 2 and 3 also show as discovered devices on the port. Hmm.
I check the arp table to see if maybe Fortilink just isn’t working, but the switches are not arping.
When checking the trunk status (get switch trunk), the trunk to FSW 2 was not there.
At this point I was a bit perplexed, so I had a user onsite reboot FSW 2. As soon as FSW 2 came back up, all switches came back online and the network remained stable.
To do a little digging, I logged directly into FSW 2 when it came back online and ran:diag debug crashlog read
I had never seen this error before and the timestamp matches exactly when my switches went offline.
I couldn’t find much on the daemon or error code, so I submitted a ticket to Fortinet support. They recommended we change power sources, which we did. However, the switch remained in POE fault status.
They eventually approved an RMA.
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