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.