Generation One ION devices use the control port to exchange HA
heartbeat and manage the controller traffic between the active and the standby
device. With the introduction of
used-for-HA (referred to as
Used-for-Control in earlier releases) as a port type,
the NextGen ION devices such as the ION 1200-S, ION 3200, ION 5200, ION 9200 do
not need a dedicated controller port for the management services. The
used-for-HA interface allows you to exchange HA
heartbeat and connect the standby device to the controller through the active
ION device. You can use the control interface to send management traffic like
App Probe, NTP, SNMP, RADIUS, and IPFIX.