Active and Standby Roles

Active and Standby Roles

Table 10-1 shows possible supervisor configurations and, for each configuration, which supervisor is active and which is standby.

Table 10-1. Supervisor Module Configurations
Configuration	Active and Standby Role
One supervisor in slot 1	The slot 1 supervisor module is active. If a supervisor module is inserted into slot 2, the slot 1 supervisor module remains active and sends health reports to the standby supervisor in slot 2.
One Supervisor module in slot 2	The slot 2 supervisor module is active. If a supervisor module is inserted into slot 1, the slot 2 supervisor module remains active and sends health reports to the standby supervisor in slot 1. If the slot 2 supervisor is removed, reset, or fails, or if the switch is reset, the slot 1 supervisor becomes the active supervisor, and the slot 2 supervisor becomes the standby. The slot 1 supervisor then sends health reports to the slot 2 standby supervisor.
Supervisor modules in slot 1 and slot 2	The slot 1 supervisor module is active and sends health reports to the standby supervisor in slot 2. If the slot 1 supervisor module is removed, reset, or fails, the slot 2 supervisor becomes the active supervisor. If you then replace the slot 1 supervisor, it remains the standby supervisor and receives health reports from the active supervisor in slot 2. If the slot 2 supervisor is removed, reset, or fails, or if the switch is reset, the slot 1 supervisor becomes the active supervisor, and the slot 2 supervisor becomes the standby. The slot 1 supervisor then sends health reports to the slot 2 standby supervisor. NOTE: Note: If the switch is reset, slot 1 supervisor is the active supervisor, unless it has failed.

NOTE: If the standby supervisor becomes active, it assumes the IP and MAC addresses of the previously active supervisor.

NOTE: When a standby supervisor is installed in the switch there is a 45-second wait period before the standby supervisor is fully initialized.

CAUTION: Do not remove the standby supervisor module during initialization.