Stacking Cisco Switches

Catalyst 9300 Stackwise System Architecture White Paper

Switch Stack (If location has switch stack)
switch# show switch
switch# switch 1 priority 15
switch# switch 2 priority 10
switch# switch 3 priority 5
switch# switch 4 priority 1
switch# switch 1-4 renumber 1-4

What is the maximum number of switches that can be stacked using Cisco StackWise?
Nine (9)

Any 3850 listed as supporting StackWise-480 can be physically connected via the stacking ports at the back of the switches. You can stack up to 9 x 3850 switches, each switch must be running the same IOS version. Except model WS-C3850-48XS, all other C3850-xxxx are StackWise-480 compatible and can be stacked together.

Reference: See Table 1. Cisco Catalyst 3850 Series configurations
Cisco Catalyst 3850 Series Switches Data Sheet – Cisco

References:

• Adding a Catalyst 9300 switch to an existing stack without a downtime – Cisco Community
• Stack Manager and High Availability Configuration Guide, Cisco IOS XE Everest 16.5.1a (Catalyst 9300 Switches)