HP Cisco MDS 9020 Cisco MDS 9000 Family Fabric Manager Configuration Guide - R - Page 390

About Crossbar Management Chapter 18 Managing System Hardware Send documentation comments to [email protected] Caution Taking the crossbar out of service may cause a supervisor switchover. To perform a graceful shutdown of integrated crossbars on the supervisor module in a Cisco MDS 9509 or 9506 Director using Device Manager, follow these steps: Step 1 Step 2 Right-click the integrated crossbar switching module. You see the context menu for that module. Select Out of Service to gracefully shut down the integrated crossbar switching module. Note To reactivate the integrated crossbar module, you must remove and reinsert or replace the crossbar module. Caution Taking the crossbar out of service may cause a supervisor switchover. Backward Compatibility for Generation 1 Modules in Cisco MDS 9513 Directors To provide backward compatibility for a Generation 1 module in a Cisco MDS 9513 chassis, the active and backup Supervisor-2 modules are associated to a specific crossbar module. The Supervisor-2 module in slot 7 is associated with crossbar module 1 and Supervisor-2 module in slot 8 is associated with crossbar module 2. You must plan for the following operational considerations before removing crossbar modules: • Whenever a crossbar module associated with the active Supervisor-2 module goes offline or is brought online in a system that is already online, a stateful supervisor switchover occurs. This switchover does not disrupt traffic. Events that cause a crossbar module to go offline include the following: - Out-of-service requests - Physical removal - Errors • Supervisor-2 module switchovers do not occur if the crossbar switching module associated with the backup Supervisor-2 module goes offline. Note Supervisor-2 module switchovers do not occur when removing crossbar switch modules on a Cisco MDS 9513 that only has Generation 2 modules installed. 18-10 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x