> # Manually Initiating a Switchover

> To manually initiate a switchover from an active supervisor module to a standby supervisor module, use the active supervisor module using Device Manager. After you enter this command, another switchover process cannot be started on the same switch until a stable standby supervisor module is available.

> To perform a switchover using Device Manager, follow these steps:

> 1. Ensure that an HA switchover is possible by selecting Physical > Modules to verify the presence of multiple modules.
> 2. In the main Device Manager screen, select Admin > Reset Switch.
> 3. Click Switch to Standby.

> The following conditions identify when automatic synchronization is possible:

> - If the internal state of one supervisor module is Active with HA standby and the other supervisor module is HA standby, the switch is operationally HA and can do automatic synchronization.
> - If the internal state of one of the supervisor modules is none, the switch cannot do automatic synchronization.

> Table 8-1 lists the possible values for the redundancy states.

> Table 8-1 Redundancy States
> State | Description
> --- | ---
> Not present | The supervisor module is not present or is not plugged into the chassis.
> Initializing | The diagnostics have passed and the configuration is being downloaded.
> Active | The active supervisor module and the switch is ready to be configured.
> Standby | A switchover is possible.
> Failed | The switch detects a supervisor module failure on initialization and automatically attempts to power-cycle the module three (3) times. After the third attempt it continues to display a failed state. Note You should try to initialize the supervisor module until it comes up as HA-standby. This state is a temporary state.
> Offline | The supervisor module is intentionally shut down for debugging purposes.
> At BIOS | The switch has established connection with the supervisor and the supervisor module is performing diagnostics.
> Unknown | The switch is in an invalid state. If it persists, call TAC.

> Table 8-2 lists the possible values for the supervisor module states.

> Table 8-2 Supervisor States
> State | Description
> --- | ---
> Active | The active supervisor module in the switch is ready to be configured.
> HA standby | A switchover is possible.
> Offline | The switch is intentionally shut down for debugging purposes.
> Unknown | The switch is in an invalid state and requires a support call to TAC.

> Table 8-3 lists the possible values for the internal redundancy states.

> Table 8-3 Internal States
> State | Description
> --- | ---
> HA standby | The HA switchover mechanism in the standby supervisor module is enabled (see the "Synchronizing Supervisor Modules" topic).
> Active with no standby | A switchover is not possible.
> Active with HA standby | The active supervisor module in the switch is ready to be configured. The standby module is in the HA-standby state.
> Shutting down | The switch is being shut down.
> HA switchover in progress | The switch is in the process of changing over to the HA switchover mechanism.
> Offline | The switch is intentionally shut down for debugging purposes.
> HA synchronization in progress | The standby supervisor module is in the process of synchronizing its state with the active supervisor modules.
> Standby (failed) | The standby supervisor module is not functioning.
> Active with failed standby | The active supervisor module and the second supervisor module is present but is not functioning.
> Other | The switch is in a transient state. If it persists, call TAC.

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