A‑Link and Private Networks

Every ztC Edge system configured with two physical machines (PMs, which are also referred to as nodes) requires a network for private management traffic between the two PMs. This private network is referred to as priv0, which is a physical, direct Ethernet, or VLANed connection between the nodes. Priv0 is used for peer node discovery and can have no other entities on it that respond to IPv4 broadcasts.

In addition to priv0, each system configured with two nodes has A-Link networks to increase data-replication performance between the PMs. A-Link networks let you sync disks, shunt networks, migrate VMs, perform heartbeat checks, and sync fault-tolerant memory.

The A-Links and priv0 are connected between the PMs in the same manner. The A-Links are connected between the blue and yellow network ports of each PM, where priv0 is shared with the A-Link on the blue network.

The simplest priv0 consists of a single Ethernet cable (crossover or straight-through) that directly connects an embedded Ethernet port on each server. If a networking device other than a single Ethernet cable is used for priv0, see ALSR Configurations.