This DisplayString is the name of the dedicated interface used for state synchronization between cluster members, per 'Cluster sync name.' This interface is the backbone that lets the standby member track every active connection so it can take over instantly, making it one of the most operationally critical links in the whole cluster; if it flaps, sync can fall behind and failovers stop being seamless. An admin seeing unexpected connection drops during failovers would check the health of the specific interface named here first.