GETVPN vs DMVPN: Understand the difference

Introduction to VPN Technologies

GETVPN and DMVPN are 2 commonly used VPN technologies in Enterprise WAN setups especially with large number of remote sites connecting to one HUB or Data Center Site. With both GETVPN and DMVPN technologies Hub to Spoke and Spoke to Spoke communication is possible. When any of these VPN solution needs to be deployed, especially on Cisco Routers, a security license is an additional overhead (cost) which needs to be considered.

Comparison Table: GETVPN vs DMVPN

These VPN terms seem quite similar, however, have some uncommon attributes/behaviours as enlisted in below table –




Terminology GETVPN is a tunnel-less VPN technology providing end-to-end security for network traffic across fully meshed topology. DMVPN provides full meshed connectivity with simple configuration of hub and Spoke. DMVPN forms IPsec tunnel over dynamically/statically addressed spokes.
Encryption Group protection Peer to Peer
Scalability More scalable than DMVPN Less scalable than GETVPN
Public Internet support Not supported (because of IP preservation) Yes
Essential Protocols GDOI , ESP NHRP
Multicast performance Better due to no multicast replication issues. Lower than in GETVPN
Failover Route redistribution and Stateful model Route redistribution model
Tunnel requirement No Yes
Target deployment Customer Sites connected on MPLS requiring additional security for communication across sites. Especially where multicast traffic is essential for enterprise. Customer Sites connected on Internet requiring Secured path for communication across sites.
Related terms Key Servers, Group Members, GDOI mGRE, NHRP
RFC RFC-3547 RFC 2332,RFC1701
Topologies Full Mesh •Hub and Spoke

•Partial and Full Mesh

Licensing Security License on Cisco Routers Security License on Cisco Routers

Download the comparison table: GETVPN vs DMVPN


Continue Reading:

Introduction to GETVPN: Group Encrypted Transport VPN


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