# History

## Navigation

Right-click the device and then select Configure > Redundancy Framework Subsystem > History.

The History dialog box provides historical information for the redundancy framework subsystem. Note that this dialog box is available only on a device that contains 2 supervisor modules.

The following information is displayed:

> Index (cRFHistorySwitchOverIndex)

> Previous Active Unit Slot Number (cRFHistoryPrevActiveUnitId)

> Current Active Unit Slot Number (cRFHistoryCurrActiveUnitId)

> Switch Over Reason (cRFHistorySwitchOverReason)

> Swact Time (cRFHistorySwactTime)

### Index (cRFHistorySwitchOverIndex)

A monotonically increasing integer used to index the history table. After reaching the maximum value, the value of this object resets to one.

### Previous Active Unit Slot Number (cRFHistoryPrevActiveUnitId)

Indicates the primary redundant unit that went down.

### Current Active Unit Slot Number (cRFHistoryCurrActiveUnitId)

Indicates the secondary redundant unit that took over as active.

### Switch Over Reason (cRFHistorySwitchOverReason)

Indicates the reason for the last switchover. There are seven possible values:

unsupported(1) | userForced(5)
none(2) | activeUnitFailed(6)
notKnown(3) | activeUnitRemoved(7)
userInitiated(4)

### Swact Time (cRFHistorySwactTime)

Indicates when the last switchover occurred.