How many VLANs are supported by each Cisco ACI VMM?

With VMM domains, a customer can scale beyond the 4000 VLANs. In a large-scale cloud environment, 4000 VLANs or identifiers is not enough to uniquely identify each EPG or network. Each VMM domain can scale up to 4000 VLANs. As a result, you can span and scale horizontally using VMM domains and achieve more than 4000 EPGs, each mutually exclusive. The only restriction, as mentioned previously, is that mobility is restricted to the VMM domain.