This section describes the additional features supported in IP Availability and Performance Manager. Health ScoreA new feature Health Score has been introduced in IP Availability and Performance Manager for Cisco ACI devices. Health Score is a preparatory metric calculated by Cisco ACI SDN based on several factors such as performance, faults, and so forth. VMM Domain IntegrationThe VMM (VirtualMachine Manager) domain allows an administrator to configure network connectivity policies for virtual machine controllers. Integration with VMware vCenter uses both IP Availability and Performance Manager, and ESM manager to create end to end association between the Cisco ACI fabric and VMware vCenter. APIC ClusterA cluster of APICs controls and manages the Cisco ACI fabric. All the APIC controllers have the full information about the fabric, at any given point. Parent topic: Cisco ACI