Multipoint GRE
The scalability offered by DMVPN is made possible, in part, by multipoint GRE (mGRE), which allows a router to support multiple GRE tunnels on a single GRE interface.
Some of mGRE’s characteristics are as follows:
Like traditional GRE, mGRE can transport a wide variety of protocols (for example, IP unicast, multicast, and broadcast).
In a hub-and-spoke topology, a hub router can have a single mGRE interface, and multiple tunnels can use that single interface.
An interface configured for mGRE is able to dynamically form a GRE tunnel ...
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