DMVPN Architecture - FVRF

[ChrisNewnham_]

Hello

I am just wondering if there are any specific architecture recommendations for using a FVRF in DMVPN, perhaps to avoid the potential recursive routing issue when a tunnel learns the route to the destination via the tunnel itself.

I know how to do it (tunnel vrf X), I'm just wondering what the recommended best practise is. I can't seem to find anything specific on it.

Thanks

Chris

[MHM Cisco World]

Frond-VRF in DMVPN is very useful if you learn default route via tunnel. 
using VRF make you have two default route one in each routing table. 

[Joseph W. Doherty]

"I am just wondering if there are any specific architecture recommendations for using a FVRF in DMVPN, perhaps to avoid the potential recursive routing issue when a tunnel learns the route to the destination via the tunnel itself."

Yes, it separates the tunnel's exterior end point public address routes from interior routes.

Years ago, I setup a DMVPN deployment (now called Phase I, I believe) where the spokes had specific static routes to the hub's external IP, but on the hub, I wanted to use a default route to the Internet as DMVPN "knew" spokes' external public IPs via NHRP.

Placing the hub tunnel in FVRF allowed me to use a default route, to direct outbound tunneling, while still having an interior default route.

As @MHM Cisco World noted, very useful.