We currently have 2 sites. The primary site has 2 WAN connections and the Secondary only 1. All 3 WAN connections terminate at 2600 series routers. I have 2 GRE tunnels setup on the Secondary site router, which terminate at each of the routers at the primary site. I've then used ospf costs on the GRE interfaces to give preference to the higher bandwidth link (I don't want to load balance)
We are loking to install a second WAN connection at the secondary site, which I will also need to introduce into the GRE network to create a kind of full mesh network. I could do this by creating 2 more tunnels on the new router, I suppose, but I would like to simplify the config instead.
If I was to modify the setup to use DMVPN GRE, all the routers will only have a single GRE tunnel, I believe. In this case, how could I control which tunnel get's preference in OSPF once the tunnels are built?
Any help would be greatly appreciated.