How to Troubleshoot Cisco’s Dynamic Multipoint VPN (DMVPN)

Dynamic Multipoint Virtual Private Network (DMVPN) is a network solution for those that have many sites that need access to either a hub site or to each other. It was designed by Cisco to help reduce the complexities in configuring and supporting a full mesh of VPNs between sites. There are other vendors that now support DMVPN, but Cisco is where it started.

Read more

Understanding Next Hop Resolution Protocol Commands

Next Hop Resolution Protocol (NHRP) is a resolution protocol that allows a Next Hop Client (NHC) to dynamically register with Next Hop Servers (NHSs). With the Dynamic Multipoint Virtual Private Network (DMVPN) design the NHC is the spoke router and the NHS is the hub router. Once all clients are registered, spoke routers can discover other spoke routers within the same non-broadcast multiple access (NBMA) network.

Read more