Knowledge Base

Design & Configure

DMVPN Phase 1 Single Hub – EIGRP – Hub example

Technology: WAN
Vendor: Cisco
Software: 12.X , 15.X ISR
Platform: ISR 1800, 2800, 3800, 1900, 2900, 3900, Platforms: 4300, 4400

Traffic Flow:

  • Packet is sent from Spoke1 to Spoke2 network via Hub (according to routing table)
  • Spoke1 has this prefix via HUB tunnel IP for which has also NHRP static mapping
  • Hub routes packet to Spoke2 according to routing table via tunnel

DMVPN Phase 1 and EIGRP:

  • Configure spokes as a stubs
  • Advertise their connected routes
  • Disable split horizon on hub (Spoke to Spoke prefix advertisement)
  • Use next-hop self command (default)


DMVPN Phase 1 Single Hub Configuration - EIGRP

router eigrp 111
no auto-summary
! Tunnel source
interface Loopback0
ip address
! VPN network
interface Loopback 1
ip address
! mGRE tunnel
interface Tunnel0
ip address
no ip redirects
ip nhrp authentication gmlabs
ip nhrp map multicast dynamic
ip nhrp network-id 111
no ip split-horizon eigrp 111
ip summary-address eigrp 111
tunnel source Loopback0
tunnel mode gre multipoint
tunnel key 123

Author: Marcin Dryjanski, Ph.D.