Apologies, just remembered that FortiGates SD-WAN routes can't be
changed to 10 as it's the default for static routes. They can be changed
to any other number though. Try changing it to 50.
I suspect you need to change the static route on your SD-WAN route. The
distance is currently set to 1, change it to 10 as this is your default
gateway presumably.
Hi, What does the 'show log' command say on the Cisco Switch, you can
filter this by interface, as an example. 'show log | i 1/0/20' Unplug
the cables/transceivers first and then do the show log to get fresh,
relevant logs. Is Spanning Tree enabled? ...