A typical Cisco ACI Multi-Site deployment requires a 3-node cluster of Multi-Site Orchestrators to manage all the sites' fabrics in your Multi-Site environment. Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/aci_multi- site/sw/2x/installation/Cisco-ACI-Multi-Site-Installation-Upgrade-Guide-221/m-multi-site-install- overview.html