Upgrading Using ISSU
In-service software upgrade (ISSU) enables you to upgrade between
Junos OS releases with no disruption on the control plane and with minimal disruption of traffic.
For additional information about using ISSU on routing and switching devices, see the High Availability User Guide.
For additional information about using ISSU on security devices,
see the Chassis Cluster User Guide for SRX Series Devices
For information about ISSU support across platforms and Junos OS releases, see the In-Service Software Upgrade (ISSU) Web application.