: Group endpoints with similar security requirements into Endpoint Groups (EPGs) and use Contracts to define communication rules. This "allow-list" approach ensures that communication is denied by default until explicitly permitted.
: The minimum recommended design for a stable fabric includes two spine nodes, two leaf nodes, and a cluster of three APICs . All leaves must connect to all spines, but they never connect to each other. cisco aci design guide
Designing an effective Cisco Application Centric Infrastructure (ACI) fabric requires a shift from traditional device-by-device configuration to a centralized, policy-driven model. By leveraging a , ACI optimizes east-west traffic and simplifies scalability. Key Design Pillars : Group endpoints with similar security requirements into
: Choose between Network-Centric design (mapping one VLAN to one EPG) for easier migration of legacy workloads, or Application-Centric design to group workloads by their functional role regardless of their subnet. Cisco Application Centric Infrastructure (ACI) Design Guide All leaves must connect to all spines, but