Cisco Catalyst 4500 and 6500 series switches support two Supervisor modules within the switch chassis to allow for HA of the switch. When the switch boots up, the first Supervisor that boots up is referred to as the Primary or Active Supervisor Engine and the second Supervisor module is referred to as the Standby or Redundant Supervisor Engine. The Standby Supervisor Engine assumes Primary Supervisor Engine status when one of the following events occurs:
- The Primary Supervisor Engine fails or crashes
- The Primary Supervisor Engine is rebooted
- The administrator forces a manual failover The content below this message is for members only.