Now that you've integrated vCenter with VMM, you can start adding the ESX hosts that are to be managed by VMM.
The following is a list of some prerequisites and recommendations that need to be taken into account when adding VMware hosts to VMM 2012 R2:
The VMware vCenter Server that manages the ESX hosts must already be configured and integrated into VMM
The host must run a supported version of VMware vSphere. For more information, refer to Chapter 1, VMM 2012 Architecture
If encryption is required for communication between VMM and the vSphere hosts, a certificate and public key for each managed ESX/ESXi host will be needed
Although it is not a requirement, you can create a host group to organize the hosts (for example, VMware Hosts)
As per best practices, create a Run As account with root credentials on the VMware ESX hosts