Recovery Procedure
This section describes the steps needed to downgrade from Crossbar Fabric-3 Switching Modules to Crossbar
Fabric-1 Switching Modules if there are issues with the Crossbar Fabric-3 Switching Modules upgrade.
Scenario 1
If a chassis is running in a mixed mode (both Crossbar Fabric-1 Switching Modules and Crossbar Fabric-3
Switching Modules in OK state), then reverse the installation process and replace the Crossbar Fabric-3
Switching Modules one-by-one with Crossbar Fabric-1 Switching Modules. As long as at least one Crossbar
Fabric-1 Switching Module is online, replacing Crossbar Fabric-3 Switching Modules with Crossbar Fabric-1
Switching Modules can be done nondisruptively. Do not remove any further Crossbar Fabric-1 Switching
Modules. If all the Crossbar Fabric-1 Switching Modules are removed or are in powered down state, then the
downgrade will be disruptive.
Scenario 2
If a chassis is loaded with all six Crossbar Fabric-3 Switching Modules, then reinstalling the Crossbar Fabric-1
Switching Modules will be disruptive. Power down the switch and manually replace the Crossbar Fabric-3
Switching Modules with Crossbar Fabric-1 Switching Modules, and then power up the switch.
Troubleshooting
If the migration procedure fails, downgrade the Crossbar Fabric-3 Switching Modules to Crossbar Fabric-1
Switching Modules.
Power Supply in a Switch Chassis
You can follow the same steps to install AC and DC power supplies into the switch, but you ground them
differently. For an AC power supply, you automatically ground it when you connect its power cable to the
power supply and the power source. For a 3-kW DC power supply, you do not directly connect the power
supply to the earth ground.
For more information on the supported power modes, power slots and power redundancy for Cisco MDS
9700 Series Switches, see Power Supplies.
Before you begin
• The switch chassis must be installed in a cabinet or rack that is secured to the data center.
• You need the following tools and equipment:
• Nut driver attachment for Number 1 Phillips-head screwdriver or ratchet wrench with torque
capability (used only for DC power supplies)
• Crimping tool
• For 3-kW DC power supplies, you need four power cables sized to reach the DC power source or
power interface unit (PIU)
• Grounding wire—Size this wire to meet local and national installation requirements. For U.S.
installations, you must use a 6 AWG copper conductor. For installations outside the U.S., consult
Cisco MDS 9700 Series Switches Hardware Installation Guide
168
Installing, Removing, and Verifying Field Replaceable Units
Recovery Procedure
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