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Impact to DMVPN Spoke-Spoke communications during Hub failure

I have an DMVPN Phase 2 network.  What is the impact to established Spoke-Spoke connections if the hub fails?  Does the choice of routing protocol impact the behaviour?  Does this change with Phase 3? 

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Cisco Employee

Re: Impact to DMVPN Spoke-Spoke communications during Hub failur

Hi,

If you are using dynamic routing protocol inside the tunnels, you will loose your routes once the Hub failed so there is nothing you can do, spoke-2-spoke communication is lost.

If you are using static routing and If the spoke already has a NHRP entry before the hub failed, it will use it. But if the remote spoke public address changed in the meantime, it will not work as there is no HUB to answer to the NHRP resolution request.

HTH

Laurent.

Community Member

Re: Impact to DMVPN Spoke-Spoke communications during Hub failur

Dear Laurent,

I am completely agree with you as we have the same senario in our network.

Can you provide me some doc or link to read up more on what you said in your reply.

Thanks,


Abhisar.

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