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DMVPN no IKE session

I have a router who acts as a hub for other five spokes in DMVPN1,and also as a spoke in DMVPN2.

It works well,except that after the first tunnel's lifetime,some tunnel's IKE will be deleted,and their vpn session will be active with no IKE.

Is this normal?Thank you.

1 REPLY
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Re: DMVPN no IKE session

GRE + IPsec must know the endpoint peer address. The spokes' IP addresses are connected directly to the Internet via their own ISP, and they are often set up so that their external interface addresses are not fixed. The IP addresses can change each time the site comes online (via DHCP).

If the spokes need to directly talk with each other over the IPsec VPN, then the hub-and-spoke network must become a full mesh. Since it is not already known which spokes will need to talk directly with each other, a full mesh is required, even though each spoke may not need to talk directly with every other spoke. Also, it is not feasible to configure IPsec on a small spoke router so that it has direct connectivity with all other spoke routers in the network; thus spoke routers may need to be more powerful routers

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_white_paper09186a008018983e.shtml#dmvpn

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