Switch Stacking and Power Stacking Guidelines
Before connecting the switches in a stack, keep in mind these stacking guidelines:
• Size of the switch and any optional power-supply module. The 1100-W power-supply module is longer
than the other modules. Stacking switches with the same power-supply modules together makes it easier
to cable the switches.
• 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 StackWise cable, the 0.5-meter cable is supplied. If you need the
1-meter cable or the 3-meter cable, you can order it from your Cisco supplier. For cable part numbers,
see StackWise Ports, on page 25. The Data Stack Cabling Configurations, on page 38 provides examples
of recommended configurations.
• For rack-mounted switch stacks that are members of a StackPower stack as well as a data stack, see
Planning a StackPower Stack, on page 40.
• You can create data stacks with up to nine switches in a stack.
Special considerations for the following switch models:
• WS-C3850-24XS-E
• WS-C3850-24XS-S
• WS-C3850-24XU-E
• WS-C3850-24XU-L
• WS-C3850-24XU-S
• WS-C3850-12X48U-L
• WS-C3850-12X48U-S
• WS-C3850-12X48U-E
Information:
• If you set up a stack with these switches, the stack can have a maximum of 8 switches only. Each of the
above switch models have 4 ASIC chips, and the maximum number of ASIC chips per stack cannot
exceed 32.
• If you set up a stack that contains the above switches and other Catalyst 3850 switches, ensure that the
maximum number of ASIC chips is 32.
Note
The Catalyst WS-C3850-48XS switch models do not support power stacking.
Note
Catalyst 3850 Switch Hardware Installation Guide
37OL-26779-05
Switch Installation
Switch Stacking and Power Stacking Guidelines
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