DMVPN Phase 1 Single Hub – OSPF – Spoke example

Design & Configure

DMVPN Phase 1 Single Hub – OSPF – Spoke 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 OSPF

  • Configure OSPF point to multipoint network type (next hop behavior)
  • Advertise spoke’s connected routers
  • Set static default routes on spokes into HUB direction via tunnel interface


DMVPN Phase 1 Single Hub Configuration - EIGRP


router ospf 111
network area 0
network area 0
interface Loopback0
ip address
interface Loopback 1
ip address
! GRE tunnel
interface Tunnel0
ip address
ip nhrp authentication gmlabs
ip nhrp map
ip nhrp map multicast
ip nhrp nhs
ip nhrp network-id 111
ip nhrp holdtime 60
ip nhrp registration timeout 30
tunnel source Loopback0
tunnel destination
tunnel key 123
ip ospf network point-to-multipoint


Author: Marcin Bialy