US Region

Grandmetric LLC
Brookfield Place Office
200 Vesey Street
New York, NY 10281
EIN: 98-1615498
Phone: +1 302 691 94 10

EMEA Region

ul. Metalowa 5, 60-118 Poznań, Poland
NIP 7792433527
+48 61 271 04 43

DMVPN Phase 2 Single Hub – EIGRP – Hub example

Design & Configure

DMVPN Phase 2 Single Hub – EIGRP – Hub example

Traffic Flow:

  • Packet is intended to be sent from Spoke1 to Spoke2 network
  • According to routing table Spoke’s2 network is known via its original next hop but it is marked in CEF as incomplete and next hop IP is marked simultaneously as CEF glean adjacency / punt (now, need to perform NHRP resolution) – the NBMA of next hop is unknown, so Spoke1 triggers NHRP resolution to NHS (including next hop of Spoke2, Source of its tunnel, it’s NBMA)
  • In the same time first packet is routed via Hub based on RIB
  • Similar thing is done by Spoke2 when it needs to send packet back to Spoke1
  • NHS responds with NHRP resolution and then CEF is populated as complete and Spokes can communicate directly

DMVPN Phase 2 and EIGRP

  • Advertise spoke’s connected routes
  • Disable split horizon on hub (Spoke to Spoke prefix advertisement)
  • Disable Next hop self feature


DMVPN Phase 2 EIGRP Hub EXample configuration



R1 Hub:

router eigrp 111
interface Tunnel0
ip address
no ip redirects
no ip next-hop-self eigrp 111
ip nhrp authentication gmlabs
ip nhrp map multicast dynamic
ip nhrp network-id 111
no ip split-horizon eigrp 111
no ip split-horizon
tunnel source Loopback0
tunnel mode gre multipoint
tunnel key 123
tunnel protection ipsec profile DMVPN_PROFILE

Author: Marcin Bialy