I have two DHCP servers. Primary and Secondary . Both are independent running Primary and Split Scope Scenario. As they are independent followed the same procedure on both the servers.
Login to 2008 R2 DHCP server. Take a Backup. Place it on a location.
It got Exported Successfully.Copied the data. Backed up to my file server
As it wanted to Retain same name and IP. I have unauthorized the DHCP server.
Shutdown the server.
Removing Authorization this Server from the directory will cause the DHCP server to stop responding to client requests.
Built a new 2012 R2 Server. with Same Name and IP,
Installed DHCP Server Role.
Once installation is completed. Complete DHCP Configuration.
Skip AD Authorization.
Choose Commit. Creating Security Groups is done.
Right Click Restore . On the DHCP Console. Choose Restore
The Specified folder may not have sufficient permissions for the DHCP service to proceed with the restore operation. Would you like to automatically try connecting to problem and retry the restore operation.
Now Verify all scopes are imported.
Right click on the server on the DHCP console . Now Authorize the server.
Make sure its listed in Authorized Servers list. Click on Manage Authorized Servers.