Application Auto-Restart on Cisco Catalyst 9300 Series Switches This section describes how application auto-restart works on Cisco Catalyst 9300 Series Switches in a multimember stack: On Cisco Catalyst 9300 Series Switches, application auto-restart is supported in 1+1 switch redundancy or StackWise Virtual modes that assign the active and standby roles to specific devices in the stack. Application auto-restart is not supported when the switch stack in is N+1 mode. If the device is in N+1 mode, the following log message is displayed on the console:
Application Hosting Application Auto-Restart on Cisco Catalyst 9300 Series Switches Scenario Single Media in the Active Device Media in the Active and Standby Devices Switchover Media is not found on the new active device. IOx starts on the system flash with no previously installed applications and with minimum capabilities. Starts IOx and the application in the previous state on the new active device after the system switchover (SSO). Does a bulk synchronization of the information to the new standby device after it boots up. Bootup or switchover: USB SSD is present on a member device. No synchronization of the SSD present in member devices.
The member SSD is not used to host IOx and applications. No synchronization of the SSD present in member devices. The member SSD is not used to host IOx and applications. Device removal: Local USB SSD is removed from the active device. When the local USB SSD is removed, IOx takes care of the graceful exit. User-triggered IOx restart is required once SSD is plugged back in the active device. IOx takes care of the graceful exit. Since IOx operates only on the local disk, the standby SSD is not used to start IOx. User-triggered IOx restart is required once SSD is plugged back in the active device. Device removal: USB SSD is removed from the standby device.
NA IOx synchronization operation fails. IOx is no longer SSO ready. Device removal: Remote USB SSD is removed from a remote member device. IOx does not use any member SSD, and hence, there is no impact. IOx does not use any member SSD, and hence, there is no impact. Device going down: The active device on which IOx is running goes down. Media is not found on the new active device. IOx starts up on the system flash with no previously installed applications and with minimum capabilities. Starts IOx and applications in the state before the SSO on the new active device. Does a bulk synchronization of the information to the new standby device once it boots up.
Designated active-standby device change (stack environment 1:1) The change is reflected after the reboot. IOx starts from the new active device after the reboot. The change is reflected after the reboot. IOx starts from the new active device after the reboot. Application Hosting 11