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Forum Replies

  1. Rene,

    When would we choose to use Phase 1, 2, or 3, and why? I understand the differences between the three, but do we gain any benefit from implementing one or the other that is noticeable to end users?

    It seems to me that perhaps allowing spoke routers to talk to each other may decrease latency in the real world, as they would not have to hop through the hub router, but other than that I'm not sure.

    Thanks,

    Patrick

  2. Hi Patrick,

    The different versions are like an evolution of DMVPN. We don't really use phase 1 anymore unless you have a really good reason why you want to force all traffic through the hub (security perhaps?). Otherwise, it's more effective to allow spoke-to-spoke traffic.

    Both phase 2 and 3 allow spoke-to-spoke traffic, the advantage of phase 3 is that we use the "shortcuts" so you don't need specific entries anymore in the routing tables of the spoke routers. I can't think of any advantages right now that phase 2 has over phase 3 so if you implement this, you probably want to use phase 3.

    Rene

  3. Could you give some examples of how this would be good for a back up network? If our circuit to the internet goes down, arent we kinda screwed anyway? Thanks...

  4. andrew says:

    Rafa,
    Not in the case where sites might have multiple circuits. For example, in my company, where we have locations all over the country, MPLS is our primary means of connecting sites, but if there is a problem with this circuit, or the provider, then a secondary standard Internet connection (many of our smaller sites simply use DSL or even 4G cellular), could take over with DMVPN configured over it.

  5. We don't have any GNS3 topology files but each DMVPN example does have configuration files. You will only have to create a new GNS3 topology, then copy/paste the commands.

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