Gracefully Shutting Down A Crossbar; Directors - Cisco MDS 9000 Series Configuration Manual

Managing System Hardware

Gracefully Shutting Down a Crossbar

You must perform a graceful shutdown of a crossbar (integrated or external) before removing it from the
MDS 9500 Series Director.
• You must enter the EXEC mode out-of-service xbar command for a graceful shutdown of external
crossbar modules in a Cisco MDS 9513 Director.
out-of-service xbar slot
slot indicates the external crossbar module slot number.
• You must enter the EXEC mode out-of-service module command for a graceful shutdown of integrated
crossbars on the supervisor module in a Cisco MDS 9506 or 9509 Director.
out-of-service module slot
slot indicates the chassis slot number on either the Supervisor-1 module or the Supervisor-2 module in
which the integrated crossbar resides.
Provideing 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:
• Supervisor-2 module switchovers do not occur if the crossbar switching module associated with the
backup Supervisor-2 module goes offline.
OL-29291-02
To reactivate the external crossbar module, you must remove and reinsert or replace the
Note
crossbar module.
To reactivate the integrated crossbar, you must remove and reinsert or replace the
Note
Supervisor-1 module or Supervisor-2 module.
Taking the crossbar out-of-service may cause a supervisor switchover.
Caution
◦ Out-of-service requests
◦ Physical removal
◦ Errors
Operational Considerations when Removing Crossbars
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