DMVPN question

[ittechk4u1]

Hello Experts,

Background I have two HUBs (diff physically location with dual ISPs) and rest 6 are spokes(4 have dual ISP and 2 are with single isp).

Is it necessary to have VRF on spoke with single ISP ?

issue is: all 4 spoke (with DUal isps) have tunnels to both HUBs and working and rest 2 hub (with single iSP) have tunnel only to HUB1 and not to HUB2!!!!

Thanks

[Georg Pauwen]

Hello,

so what do you have, dual hubs with dual ISPs for both hubs, or just for one ? Post a schematic drawing of your topology. Typically, one hub would be configured with a lower delay than the other for redundancy. If some of your spokes are connected just to one hub, it wouldn't matter because they would always use that one hub.

[ittechk4u1]

Thanks Georg,

Yes I have dual hub with dual ISPs. 4 spoke with dual ISPs and 3 spoke with single ISP.

here is the attached layout:

Thanks

[Georg Pauwen]

Hello,

in your topology drawing it looks like all spokes have dual links. Either way, if you have only one link for 3 of the spokes, all you have to do is map them to just one hub. VRF is not needed as far as I can tell.

[ittechk4u1]

I mapped these 3 spokes(with single ISP) to both HUBs(one tunnel for each ISP of hubs). 

HUB and 4 spokes(with dual ISP) are configured with vrf and rest 3 spoke with single ISP is with normally routing process.

I hope this design is ok!!!

Thanks

[ip_guy]

Hello colleague,

To be honest, I also have some issues during implementing DMVPN just in my case I have one spoke and two hubs. I have to make backup tunnel with different ISP in case if primary link goes down. Just to let you know I didn't configure VRF on SPOKE, VRF should me configured on PE Router.

I would appreciate if you can share configuration file (config.log ) from one SPOKE and one HUB so I can compare with my environment and try to fix the issue.

Thank you in advance.

Cheers,

Milos