S3900 SERIES SWITCHES STACKING CONFIGURATION GUIDE
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(4) Check the interface information, the switch will show all the interface, the four ports for stacking will not show in the port list.
Switch#show interfaces brief
Interface Type Admin Link-Status Negotiation Speed/Duplex Group
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Eth 1/1 1000BASE-T Up Down Auto None
Eth 1/ 2 1000BASE-T Up Down Auto None
Eth 1/ 3 1000BASE-T Up Down Auto None
Eth 1/ 4 1000BASE-T Up Down Auto None
Eth 1/ 5 1000BASE-T Up Down Auto None
Eth 1/ 6 1000BASE-T Up Down Auto None
Eth 1/ 7 1000BASE-T Up Down Auto None
Eth 1/ 8 1000BASE-T Up Down Auto None
Eth 1/ 9 1000BASE-T Up Down Auto None
Eth 1/10 1000BASE-T Up Down Auto None
Eth 1/11 1000BASE-T Up Down Auto None
Eth 1/12 1000BASE-T Up Down Auto None
Eth 1/13 1000BASE-T Up Down Auto None
Eth 1/14 1000BASE-T Up Down Auto None
Eth 1/15 1000BASE-T Up Down Auto None
Eth 1/16 1000BASE-T Up Down Auto None
Eth 1/17 1000BASE-T Up Down Auto None
Eth 1/18 1000BASE-T Up Down Auto None
Eth 1/19 1000BASE-T Up Down Auto None
Eth 1/20 1000BASE-T Up Down Auto None
Eth 1/21 1000BASE-T Up Down Auto None
Eth 1/22 1000BASE-T Up Down Auto None
Eth 1/23 1000BASE-T Up Down Auto None
Eth 1/24 1000BASE-T Up Down Auto None
Eth 1/25 1000BASE-T Up Down Auto None
Eth 1/26 1000BASE-T Up Down Auto None
Eth 2/1 1000BASE-T Up Down Auto None
Eth 2/ 2 1000BASE-T Up Down Auto None
Eth 2/ 3 1000BASE-T Up Down Auto None
Eth 2/ 4 1000BASE-T Up Down Auto None
Eth 2/ 5 1000BASE-T Up Down Auto None
Eth 2/ 6 1000BASE-T Up Down Auto None
Eth 2/ 7 1000BASE-T Up Down Auto None
Eth 2/ 8 1000BASE-T Up Down Auto None
Eth 2/ 9 1000BASE-T Up Down Auto None
Eth 2/10 1000BASE-T Up Down Auto None
Eth 2/11 1000BASE-T Up Down Auto None
Eth 2/12 1000BASE-T Up Down Auto None
Eth 2/13 1000BASE-T Up Down Auto None
Eth 2/14 1000BASE-T Up Down Auto None