Cisco Catalyst 2960 Series, Configuration Manual

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members, with one of them as the active switchstack master. You can connect standalone switches to an
existing switch stack to increase the stack membership.
Figure 65: Creating a Switch Stack from Two Standalone Switches
Figure 66: Adding a Standalone Switch to a Switch Stack
Changes to Switch Stack Membership
If you replace a stack member with an identical model, the new switch functions with exactly the same
configuration as the replaced switch, assuming that the new switch (referred to as the provisioned switch) is
using the same member number as the replaced switch.
The operation of the switch stack continues uninterrupted during membership changes unless you remove the
active switchstack master or you add powered-on standalone switches or switch stacks.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About Switch Stacks