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Forum Replies

  1. Hi This is an excellent article.

    But I have one quesion.

    HUBs
    ip nhrp network-id 1
    
    SPOkES
    ip nhrp network-id 2
    

    Is it Ok that HUBs and SPOKEs network-id is different?

  2. Hi Rene,
    Actually, I’m building a DMVPN lab 2 hubs and spokes. the 2 hubs is located in different subnets as follows :
    Hub01 :

    
    interface Tunnel0
     ip address 172.16.253.1 255.255.255.0
     no ip redirects
     ip nhrp authentication DMVPN
     ip nhrp map multicast dynamic
     ip nhrp network-id 1
     tunnel source GigabitEthernet0
     tunnel mode gre multipoint
     !
    end
    
    

    Hub02 :

    
    interface Tunnel0
     ip address 172.16.254.1 255.255.255.0
     no ip redirects
     ip nhrp authentication DMVPN
     ip nhrp map multicast dynamic
     ip nhrp network-id 2
     tunnel source GigabitEthernet0
     tunnel mode gr
    ... Continue reading in our forum

  3. Hi Soufiane,

    EIGRP will produce this error when you have two devices on the same segment, sending hello packets to each other but using different subnets. Any chance your spoke routers are connecting to the wrong hub / using the wrong tunnel? Without EIGRP, are you able to ping the tunnel interfaces?

    You might want to compare my configs with yours, you should be able to load mine (with EIGRP) and run those without any errors.

    Rene

  4. Hi Rene!
    Is it always important to give the HUB-2 information about HUB-1 via:

    ip nhrp map 172.16.1.2 192.168.1.2
    ip nhrp map multicast 192.168.1.2
    ip nhrp nhs 172.16.1.2
    

    And if yes, why not HUB-1 giving information about HUB-2 also the same way (as I saw in a Cisco community entry but without explaination)

    Or does it only apply for OSPF?
    I want to use EIGRP over the DMVPN cloud.

    Best regards
    Alex

  5. Hello Dawit

    By using the show dmvpn command on the spoke routers, you can see that there are indeed two peers. Both hub routers are registered. You can also check routing in the spokes and see that there are indeed two equal cost routes via both hubs. You can even shut down the interface of Hub1 and check both the DMVPN peering as well as the routing and verify that hub 2 is indeed showing up in both routes and peers.

    Note here that both hubs appear as equals, that is, that both are used simultaneously, as they are considered equal cost paths. If you want t

    ... Continue reading in our forum

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