@silverwizard Today, I spun up OSPF on a Mikrotik in the old core, in a VRF, trunked a new VLAN over to the 'new core,' and tested migrating individual tower sites to the VRF.
It was terrifying, I was just waiting to get knocked out, and safe mode engaging, which would mean a 2-3 minute outage.
Shit like this is trivial on real network OS.