FlexVPN vs DMVPN for CCIE Security: Which VPN Framework Should You Master?
FlexVPN and DMVPN are the two VPN frameworks that define Cisco’s site-to-site and remote access tunnel architectures — and the CCIE Security v6.1 lab tests both extensively. FlexVPN, built on IKEv2 (RFC 7296), unifies site-to-site, hub-and-spoke, and remote access VPN under a single CLI framework with smart defaults that cut configuration by 60-70%. DMVPN, the mGRE + NHRP + IPsec overlay that has dominated enterprise branch networking since IOS 12.4, still powers over 70% of production branch VPN deployments according to Cisco’s enterprise networking data. ...