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DMVPN dual hub config issues

Unanswered Question
Dec 1st, 2008
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Hey Guys.

I have a 3 spokes right now and two hubs. The other day I rebooted one of the hubs and noticed that I had lost the tunnels to all of my spokes. I thought they would continue routing through the head end that was still up but that wasn't the case. Any ideas (see spoke config below)

interface Tunnel10

ip address x.x.x.x x.x.x.x

no ip redirects

ip mtu 1400

ip nhrp authentication abc123

ip nhrp map multicast x.x.x.x

ip nhrp map multicast x.x.x.x

ip nhrp map x.x.x.12 x.x.x.x

ip nhrp map x.x.x.13 x.x.x.x

ip nhrp network-id 200

ip nhrp nhs x.x.x.12

ip nhrp nhs x.x.x.13

ip tcp adjust-mss 1360

no ip split-horizon eigrp 100

tunnel source Fastethernet4

tunnel mode gre multipoint

tunnel key 1234

tunnel protection ipsec profile spokes

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AJAZ NAWAZ Mon, 12/01/2008 - 09:26
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B Rockburn,

Are the spokes normally sending/receiving traffic via the hub that you rebooted, and you was expecting the secondary hub to takeover?


Giuseppe Larosa Mon, 12/01/2008 - 09:29
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Hello Brent,

you should provide also the configuration of the two hubs, of the eigrp routing processes and the isakmp config ( focus on isakmp keepalive settings)

you have two hubs in the same DMVPN cloud it is important to daisy chain the NHRP configurations on the two hubs so that each sees the other as an NHRP server

Hope to help


Brent Rockburn Mon, 12/01/2008 - 09:55
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Thanks I didn't have them pointing to eachother so that probably didn't help.

I'll try it out and let you know.


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