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DMVPN - Hub-to-Hub Tunnel

In Phase-3 why we need to setup hub-to-hub GRE tunnel? What purpose does it serves?

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DMVPN - Hub-to-Hub Tunnel

This is mostly for logical separation of features, routes and "switching".

hub-to-hub tunnel is where you would receive a bigger summary route and where you will forward unknown NHRP requests.

Having two separate tunnels also helps scale better in terms routing protocol broadcasts/mcasts, but one can argue that BGP would not be affected ;-)

I would not recommend having one tunnel interface although you could achieve a functioning (but maybe less scalabale) setup.

M.

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