Single-appliance versus high-availability deployments
In a single-appliance deployment (basic deployment), Core connects to the storage array through a data interface. Depending on the model of the Core, the data interface is named ethX_Y in which X and Y are some numerical value such as eth0_0, eth0_1, and so on. The primary (PRI) interface is dedicated to the traffic VLAN, and the auxiliary (AUX) interface is dedicated to the management VLAN. More complex designs generally use the additional network interfaces.
In a high-availability (HA) deployment, two Cores operate as failover peers. Both appliances operate independently with their respective and distinct Edges until one fails; then the remaining operational Core handles the traffic for both appliances.
Core single-appliance deployment

Core high-availability deployment
