I would like to know if I need to replace/migrate my IOS CA server at some point, in a GETVPN environment , will the GDOI group function with certificates from both new and old CA servers concurrently at that time. Any pointers is highly appreciated.
I don't know about GDOI. I do have some knowledge about CA's.
As long as the devices have a trust chain they should be happy. If you deploy a new certificate server, and you configure your devices to trust both CA's, then everything should be happy.
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