Hybrid Virtual Private Networks
Rather than just using a single MPLS-based VPN technology or a single tunnel-based VPN technology, you can use select VPN technologies in tandem. For example, you might want to extend an MPLS network at one corporate location to MPLS networks at remote corporate locations, while having a requirement that traffic traveling through a service provider’s cloud be encrypted.
You could meet the requirements of such a design by having a Layer 3 MPLS VPN set up over a DMVPN. The DMVPN technology carrying the Layer 3 MPLS VPN traffic allows you to efficiently set up direct links between corporate locations, and it also allows you to use IPsec, which can encrypt the traffic flowing through the service provider’s cloud.
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