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DMVPN 3, deny Spoke to Spoke Traffic, and allow a certain Spoke to be reached by the other Spokes.

Last Modified: 2016-01-02
In DMVPN Phase 3, I need to deny Spokes to reach each other, except a certain Spoke I will name it here SPOKE-X.
I need all the Spokes to communicate with SPOKE-X, but all the Spokes must not communicate with each other.

With DMVPN Phase 1, the answer is turn of  split-horizon on tunnel interface and to use Distribute-List in the EIGRP (My interior routing protocols).

I will upgrade My DMVPN to Phase 3, to Save the Bandwidth on the HUB for the Traffic from Spokes to SPOKE-X

 I need your help please.
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Distinguished Expert 2019

You can not use LANs of the spokes in the Nonat rule on the hub, your site to site hub to spoke using dynamic publishing networks, while your ACL will dictate whether the spoke has access rights to the other remote spoke.
Limit the advertising of routes hub to spoke ....... Just the segments to which it can go.
Make sure you also do not exempt IPSec/VPN from nat rules.
This way your hub ACL rules along with your network advertisement will dictate which and whether a spoke can access another spoke via the hub.

Since you mentioned a spoke, you do not have a mesh setup where certain spokes have direct connection between them.


thanks arnold
i need to prevent Spokes to receive other Spokes routs

Distinguished Expert 2019

Control the advertisement of those routes to the spokes, it sounds as though your HUB transmits the same set of routes to all spokes.

Does the Cisco cover your setup?

I.e. whether the spoke to spoke communication is not via the HUB but rather the spoke initiates/establishes a VPN connection directly to the spoke to which there is traffic .......?
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