Ccna routing and Switching Complete Study Guide

Cisco DMVPN (Cisco Proprietary)

The Cisco Dynamic Multipoint Virtual Private Network (DMVPN) feature enables you 

to easily scale large and small IPsec VPNs. The Cisco DMVPN is Cisco’s answer to allow 

a corporate office to connect to branch offices with low cost, easy configuration, and 

flexibility. DMVPN has one central router, such as a corporate router, which is referred 

to as the hub, and the branches are called spokes. So the corporate to branch connection 

is referred to as the hub-and-spoke interconnection. Also supported is the spoke-to-spoke 

design used for branch-to-branch interconnections. If you’re thinking this design sounds 

eerily similar to your old Frame Relay network, you’re right! The DMPVN features enables 

you to configure a single GRE tunnel interface and a single IPsec profile on the hub router 

to manage all spoke routers, which keeps the size of the configuration on the hub router 

basically the same even if you add more spoke routers to the network. DMVPN also allows 

spoke router to dynamically create VPN tunnels between them as network data travels 

from one spoke to another.