how to redeploy CAS server?

Hello,

Exchange 2013 CU6 was accidentally uninstalled, we have two CAS servers one server was repaired by MS support and the other is not, the support recommended us to format and redeploy Exchange 2013 CAS roll.

what i'm worried about we will recreate the new CAS server with same name and IP address, Is there any prerequisite that we must do so the deployment run smooth and to mitigate any conflicts in our deployment.

Is there any cleanup steps that we need to follow prier installing the rule. 

Thanks,

Ahmed Salah