We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is Why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career!
  • Full Access to our 588 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)

 

312 New Members signed up the last 30 days!

satisfaction-guaranteed

100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!

Tags: , , ,


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. No problem Jevon :slight_smile:

    Take a look at the configuration here:

    DMVPN Phase 1 Basic Configuration

    The Gigabit interfaces are for the "underlay" network. These could be the interfaces that connect your router to the ISP, it's where you have your public IP address. Just like with "regular" routing, you can connect from many different sources to one IP address.

    The tunnel interface on the hub router uses the Gigabit Interface as its source and it can accept connections from many different spokes. All spoke routers connect to the same IP address and the hub will accept these connections.

    Rene

  4. 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...

  5. 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.

15 more replies! Ask a question or join the discussion by visiting our Community Forum