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Hub with Redundancy connected to Spokes with Overlapping IP Addresses

Hi Everyone,

 

I was just wondering what would be the best possible solution to configure a Hub/Spoke network topology using CISCO ASAs when the spoke networks have overlapping IP addresses and the Hub also needs redundancy (Hubs are not in the same subnet)

 

Currently the set up has been configured with XLATED IP on both Hub/Spoke addresses to fix the overlapping IP address issue. 2 concurrent VPN tunnels (2 Hubs connections to each Spoke) connected to achieve some sort of redundancy. This configuration works but I don't think it is very optimised.

 

Would configuring OSPF be a potential solution in allowing only 1 active tunnel. Although we have no issue running 2 concurrent tunnels, it would be more efficient to only have 1 active tunnel and 1 as standby when the active goes down. Which also brings me to my next question, does OSPF automatically switch the standby ASA back to the "active" ASA when the "active" ASA comes back online?

 

Regards,

Edward

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