The classful router is looking at the 10.x.x.x network as a class A or 255.0.0.0 masked network. It will naturally drop any packets it doesnt think it owns. Turn off this classful thinking by typing ip classless in global config mode.
Try to use extended ping from the router and ping a device on network 10.10 using the router interface IP address on the 10.80 network. If you don't get a reply, it could be wrong default gateway on all the devices on your LAN.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...