Dmvpn Multi HUBS Problem

[cemrecanaltinel]

I am stuck on this issue, please help me. In my central location, the routers connected to each other with HSRP have Dmvpn configuration. These devices communicate with other routers in the field as hubs. I will now position the router in another location to the emergency control center and also provide emergency control of the routers in the field. The Router at the center needs to communicate with the spoke and I need to apply Dmvpn on that Router. My question is, can there be 2 different Hubs at the same time? Will this cause a problem? How do the spokes decide which Hub to communicate with each other?

[Rob Ingram]

@cemrecanaltinel you can configure 2 different hubs, depending on your design you can either load balance over both hubs. Example:

interface Tunnel0
 ip nhrp map multicast 1.1.1.1
 ip nhrp map 10.5.0.1 1.1.1.1
 ip nhrp map multicast 2.2.2.1
 ip nhrp map 10.5.0.2 2.2.2.1
 ip nhrp nhs 10.5.0.1 priority 1 cluster 1
 ip nhrp nhs 10.5.0.2 priority 2 cluster 1

Alternatively you use the command max-connections 1 to configure only 1 active hub (a primary) and failback to the secondary if the primary fails. Example:

interface Tunnel0
 ip nhrp nhs cluster 1 max-connections 1

This guide demonstrates both examples mentioned: https://integratingit.wordpress.com/2016/10/12/configuring-dmvpn-phase-3-dual-hub/

[cemrecanaltinel]

Thanks for reply,it could help me

[Gopinath_Pigili]

Hi cemrecanaltinel, 

Please go through the following link....which provides detailed documentation for different DMVPN topologies...including Dual-hub:

https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/41940-dmvpn.html

Best regards
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[cemrecanaltinel]

Ye,it so helpul for me ,I am looking that documentation