Planning a StackPower Stack
StackPower Stacking Guidelines
You can configure a StackPower stack for either power sharing or redundancy. In power-sharing mode, the
power of all the power supplies in the stack is aggregated and distributed among the stack members.
In redundant mode, when the total power budget of the stack is calculated, the wattage of the largest power
supply is not included. That power is held in reserve and used to maintain power to switches and attached
devices when one power supply fails. Following the failure of a power supply, the StackPower mode becomes
power sharing.
Power-sharing mode is the recommended configuration for Cisco Catalyst 9300 Series Switches.
Note
For general concepts and management procedures for switch power stacks, see the Software Configuration
Guide on Cisco.com.
Before connecting the switches in a power stack, keep in mind these guidelines:
• A switch power stack can include a maximum of four switches in a ring topology and eight switches in
a star topology.
• Size of the switch and any optional power supply module. The 1100-W power-supply module is 1.5
inches (3.81 cm) longer than the other modules, and with the attached cable retention clip, it extends 3
inches (7.62 cm) from the switch chassis. Stacking switches with the same power-supply modules together
makes it easier to cable the switches. For switch dimensions, see Appendix A, “Technical Specifications.”
• Length of cable. Depending on the configurations that you have, you might need different-sized cables.
If you do not specify the length of the StackPower cable, the 0.3 meter cable is supplied. If you need the
1.5 meter cable, you can order it from your Cisco supplier. For cable part numbers, see StackPower
Connector, on page 18. The StackPower Cabling Configurations, on page 29 provides examples of
recommended configurations.
• For rack-mounted switch stacks that are members of a data stack and a StackPower stack, see Switch
Stacking and Power Stacking Guidelines, on page 26
StackPower Cabling Configurations
This section describes the recommended cabling configurations for a StackPower stack. There are two types
of StackPower cables.
The cable in the figure connects a switch to another switch in a power stack or with an XPS. StackPower
cables have color bands on the cable ends:
• The cable end with the green band can connect only to a switch.
• The cable end with the yellow band can connect to a switch or an XPS.
The cable is available in two lengths.
Cisco Catalyst 9300 Series Switches Hardware Installation Guide
29
Switch Installation
Planning a StackPower Stack
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