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CAR REDUNDANCY (CISCO ACCESS REGISTRAR)

I'm interested in using CAR for a radius deployment.  Geographic redundancy is needed so I was looking for the right way to accomplish this requirement.

I know that CAR can be deployed in active/active or active/standby.  In this case I would need server A in DataCenter A and the server B in DataCenterB.  I understand that it is possible to have active/active configuration in this scenario with clients in DataCenter A directing traffic to the server A and clients in DataCenterB directing traffic to server B.  Now, what happens if I try to setup active/standby configuration with the active server in datacenter A and the standby in datacenter B, is that possible? Do they need to be in the same LAN segment?  This question raised because in active/active we need two CAR base licenses but in active/standby we would need just one base and one secondary which is a lot less expensive.

Thanks for your support.

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