Solved: If hub-router which has static public IP address shut down in DMVPN...

cisco_fun_4899 · ‎08-01-2010

Hi,

I'm going to design a DMVPN full-mesh network same as following topology.

If hub-router which has static public IP address shut down, would another three routers be able to keep their tunnels?

Regards,

Tomoyuki

Jitendriya Athavale · ‎08-01-2010

depends on whic hphase of dmvpn u r running

what code r u running on your routers

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Jitendriya Athavale · ‎08-01-2010

assuming you have a pretty decent code

i do not think anything would happen, the tunnel will continue to be up

but just make sure that the duration of downtime is less than the time remaining for the tunnel to reestablish

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rahgovin · ‎08-02-2010

The answer is no, as the nhrp mappings will change and there will have to be a change in the hub. You could configure a dual hub scenario where if one goes down the other can take over.

http://www.cisco.com.az/en/US/docs/solutions/Enterprise/WAN_and_MAN/VPNLoad/ch8_Dual_external_docbase_0900e4b180ac09d0_4container_external_docbase_0900e4b180ace543.html#wp1038638

View solution in original post

Jitendriya Athavale · ‎08-01-2010

depends on whic hphase of dmvpn u r running

what code r u running on your routers

Jitendriya Athavale · ‎08-01-2010

assuming you have a pretty decent code

i do not think anything would happen, the tunnel will continue to be up

but just make sure that the duration of downtime is less than the time remaining for the tunnel to reestablish

cisco_fun_4899 · ‎08-01-2010

Hi jathaval,

Thank you for your good help.

I got it,

Next question.

After the hub-router has downed, the mesh tunnel will be composed of three spoke-routers which have public dynamic IP address.

Once one of the three routers has reloaded and the IP address has changed, can they keep their mesh tunnel without hub-router whitch has public static IP address?

If the answer is NO, can I prepare anything for this?

For example, replace one of the public dynamic IP by static one in order to put second static-IP-router in the DMVPN topology.

Regards,

Tomoyuki

rahgovin · ‎08-02-2010

The answer is no, as the nhrp mappings will change and there will have to be a change in the hub. You could configure a dual hub scenario where if one goes down the other can take over.

http://www.cisco.com.az/en/US/docs/solutions/Enterprise/WAN_and_MAN/VPNLoad/ch8_Dual_external_docbase_0900e4b180ac09d0_4container_external_docbase_0900e4b180ace543.html#wp1038638

cisco_fun_4899 · ‎08-02-2010

Super!!

Thank you for your great help!

I'll try this scenario.

Regards,

Tomoyuki