I have a CRS328 PoE switch  running a basic port based VLAN with a trunk port to a router and IP access for switch admin purposes. This works fine with ROS 6.48.6 LTS.
But I tried an upgrade to ROS 7.1.1 and it did not work. I could SSH into the switch and ping any host on the same subnet/vlan but not the router gateway accessed through the trunk port.
Spent hours and lots of RTFM but could not find a solution. Does anyone have insight what is happening here?