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  • DMVPN Phase 1 Single Hub – EIGRP – Hub example

    Design & Configure

    DMVPN Phase 1 Single Hub – EIGRP – Hub example

    Technology: WAN
    Area: DMVPN
    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


    R1:
    !
    !
    router eigrp 111
    no auto-summary
    network 10.1.0.0 0.0.255.255
    network 172.16.1.0 0.0.0.255
    !
    ! Tunnel source
    !
    interface Loopback0
    ip address 10.149.1.1 255.255.255.0
    !
    ! VPN network
    !
    interface Loopback 1
    ip address 10.1.1.1 255.255.255.0
    !
    ! mGRE tunnel
    !
    interface Tunnel0
    ip address 172.16.1.1 255.255.255.0
    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 10.0.0.0 255.0.0.0
    tunnel source Loopback0
    tunnel mode gre multipoint
    tunnel key 123

    Author: Marcin Dryjanski, Ph.D.
     
    Grandmetric