I have routing challenge here. The scenario is we have 2 sites to be connected to the Head office. The primary routing they had used (used for how many years) is static, then through the years their business requirements is increase and they nee to back up path going to the head office. Connection they have used is DMVPN and routing from two site going to the Head office is dynamic - OSPF. Because I know usually OSPF is Primary and back up is static.