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Forum Replies

  1. Rene,

    What is the impact if the traffic go to the hub then to the other spoke ?

  2. Ahmad,
    One of the key features (and limitations) of DMVPN Phase 2 is that each spoke can learn routes to every other spoke directly. It learns about these routes from the Hub, so it is ultimately up to the spoke to make its own determination via BGP or its own routing protocol, the best path to take to get to another spoke.

    So think of it this way: In Phase 2, the Hub is still the “hub” for the control plane–all routes are learned through the hub. Spokes cannot exchange routes with each other directly. However, the Hub is no longer necessarily in the data p

    ... Continue reading in our forum

  3. Hi Rene,

    I am dealing with another issue using GNS3.
    during the phase 2 configuration.

    1- the Hub is neighbor ONLY with spoke1
    2- Spoke2 and Spoke3 are neighbor with the Hub however the adjacency is flapping

    I did a debug on the hub and it never receive hello from spoke2 and spoke3 but I sending hello packets, debug on spoke2 show hello packets coming from the Hub and the spoke sending hello out.

    Thanks again for your help.

    have you experienced that type of issue ? do you have any recommendation ?

  4. Hi Wandjlaye,

    It’s been awhile since I used GNS3. I would recommend to test this on some newer IOS 15 routers first, just to make sure it’s not a GNS3 issue. Try it on Cisco VIRL or on some real routers.


    1. Why don’t You configure Spoke1 and Spoke2 simalar to Hub the with the command:
      **ip nhrp map multicast dynamic**

    Is it possible to configure Spoke1 and Spoke2 so they can ask Hub:
    “Hi NHRP server, I need to send multicast so give me public addresses for all routers”?’

    If it is not possible - are there any important consequence that Spokes cannot exchange multicast?

    1. How does the command “ip next-hop-self eigrp” exactly work? Does it work:
      a) only for routes learnt AND sent via tunnel interface?
      b) for routes learnt via tunnel interface AND sent via ANY inter
    ... Continue reading in our forum

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