Pre-ISSU Compatibility Checks for a Traditional Stack
After ISSU is triggered, but before ISSU processing begins, a pre-ISSU compatibility
check is executed.
The compatibility check determines whether the stack is ready for an upgrade. A successful compatibility check for a stack displays the passing results, as shown in the following table.
Pre-ISSU Checks for a Traditional Stack
| Check | Passing Result |
|---|---|
| Stacking Topology is Ring | Yes |
| Standby Present | Yes |
| Standby ready for upgrade | Yes |
| Flash use in progress | No |
| Stack interactive-setup in progress | No |
| Stack ZTP is configured | No |
| ISSU in progress or aborted | No |
| Election pending | No |
| Election in progress | No |
| Reload pending | No |
| CPU utilization high | No |
| All units in ready state | Yes |
| Primary Image is upgrade compatible | Yes |
| Secondary Image is upgrade compatible | Yes |
| Startup config and running config Same | Yes |
| Boot option present in running config | No |
| User in Config mode | No |
| POE-Firmware Download is in Progress | No |
| System ready for issu | If this flag is present, you can proceed with ISSU. Otherwise, check the conditions flagged by three asterisks (***) and make prescribed corrections to the device before performing an ISSU. |