Comparing DMVPN Single Tier and Dual Tier Headend Architectures – IPSec VPN & mGRE Termination

This article explains the difference between DMVPN Single Tier and Dual Tier Headend setup. We examine each model and show how IPSec and GRE/mGRE tunnels terminate on the Hub Headend and Frontend router. Detailed diagrams show how protocol packets are encapsulated and decapsulated for each scenario.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/910-cisco-dmvpn-single-dual-tier.html

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