Cisco Cisco 4G LTE Enhanced High-Speed WAN Interface Cards for Europe

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6. DMVPN over 4G LTE as a Primary WAN

For enterprise deployments with a large number of remote sites or branch offices, DMVPN is used. DMVPN

provides the scalability and manageability required by such large-scale deployments. This hub-to-spoke topology

also supports spoke-to-spoke traffic patterns. At startup, a branch-office (spoke) site establishes a DMVPN

connection to the hub site and establishes a routing protocol adjacency. Traffic between the spoke and hub

traverses this DMVPN connection. When traffic needs to flow between branch offices, DMVPN establishes a

spoke-to-spoke tunnel dynamically for more direct and efficient traffic forwarding.

shows a sample configuration, which uses Enhanced IGRP (EIGRP) as an Interior Gateway Protocol

(IGP) for dynamic routing updates between the DMVPN hub and spokes.

Figure 6. DMVPN over 4G LTE as Primary WAN

Configuration of Branch Office 1 as a DMVPN Spoke

crypto isakmp policy 10

hash md5

authentication pre-share

!ISAKMP policy for phase 1 negotiation

crypto isakmp key cisco123 address 0.0.0.0 0.0.0.0

!Preshared key for Hub, and remote DMVPN spokes