What is the minimum number of APICs does Cisco recommend to deploy in a production cluster?

A single APIC provides no redundancy and is not recommended for production environments due to the lack of high availability and a single point of failure.

Cisco recommends a minimum of three APICs for a production cluster. This 3-node cluster provides necessary redundancy and quorum for the control plane, ensuring that the ACI fabric remains operational even if one APIC fails, maintaining fault tolerance and high availability.

While a 4-node cluster is possible, it does not provide better fault tolerance than a 3-node cluster for quorum majority (it still tolerates one failure) and adds unnecessary operational overhead and cost compared to the recommended minimum.

A 5-node cluster provides better redundancy (tolerates two failures) but is not the minimum recommended for production; the additional resources are typically reserved for larger-scale deployments or specific requirements, not the baseline minimum.