Planning A Stackpower Stack; Stackpower Stacking Guidelines - Cisco Catalyst 9300 Series Hardware Installation Manual

Switch Installation
• In a split stack, depending on where the active and standby switches are located, either two stacks might
Note These results depend on how the switches are connected. You can remove two or more switches from the
stack without splitting the stack.
For conditions that can cause a stack reelection or to manually elect the active switch, see the stacking software
configuration guide on Cisco.com at this URL: http://www.cisco.com/go/c9300.

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
• Size of the switch and any optional power supply module. The 1100-W power-supply module is 1.5
• Length of cable. Depending on the configurations that you have, you might need different-sized cables.
• For rack-mounted switch stacks that are members of a data stack and a StackPower stack, see
be formed (with the standby taking over as the new active switch in the newly formed stack) or all the
members in the newly formed stack might reload.
a star topology.
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."
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
Connector, on page 17. The
recommended configurations.
Stacking and Power Stacking Guidelines, on page 24
StackPower Cabling Configurations, on page 28
Cisco Catalyst 9300 Series Switches Hardware Installation Guide

Planning a StackPower Stack

StackPower
provides examples of
Switch
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