Cisco Cisco 5760 Wireless LAN Controller Technical References

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If you enter the switch stack-member-number stack port port-number disable privileged EXEC command
and the stack is in the partial-ring state, you cannot disable the port. This message appears:
Disabling stack port not allowed with current stack configuration.
Examples
This example shows how to disable stack port 2 on member 4:
Controller#
switch 4 stack port 2 disable
Consolidated Platform Command Reference, Cisco IOS XE Release 3SE (Cisco WLC 5700 Series)    
   OL-29471-01
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switch