Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
Your use case is to advertise NAT DIA default route FROM HUB/DC to SPOKE Edge routers only when DIA in HUB/DC is UP. For this you could configure a DIA NAT route under VRF of HUB/DC router and use "advertise network 0.0.0.0/0" command inside the inte...