Description: Indicates the reason of the status changed, e.g. 1. Down --> Master: Priority is 255 2. Down --> Master: Priority higher than remote box 3. Down --> Master: Timed out waiting for master 4. Down --> Backup: Remote box has higher priority 5. Down --> Backup: Master has lower priority, but preemption is disabled 6. Master --> Backup: Relinquished by user 7. Master --> Backup: Preempted by remote box 8. Master --> Down: Priority is 0 9. Master --> Down: Vrrp failover group is disabled. 10. Master --> Down: No valid virtual routers configured 11. Backup --> Master: Priority higher than remote box 12. Backup --> Master: Priority is 255 13. Backup --> Master: Timed out waiting for master 14. Backup --> Down: Priority is 0 15. Backup --> Down: Vrrp failover group is disabled 16. Backup --> Down: No valid virtual routers configured