4.1 - still not sure what solution "should be"
I'm trying to figure out what "the vrf interfaces are different in the question than the solution" means exactly. Sorry to be a bubble head, but I didn't think there was a way to route between vrf's. And that was the point. From R6 perspective it should only be able to ping from VRFA the ip's associated with VRFA.
So are you saying that 192 should be in VPNA and that 172 should be in VPNB ?
OR is this some router trick that I should be able to route from VRF_A on R6 to VRF_B on Sw 1? The task does say "configure R6 so that you can ping 'between' the abovementioned Loopback subnets."