Hello Brecht.lecluyse1,
To answer you question in the Admin guide his the functions of the stack ports:
Stack Ports:
Ports in a stack must be reserved to be one of the following port types:
• Network Ports—Also known as uplink ports. These are ports that are connected to the network.
• Stack Ports—Ports that connect two units in a stack. Stack ports are used to transfer data and protocol packets among the units. You must indicate to the system (reserve) which ports you plan to use as stack ports (in the System Mode and Stack Management page). All ports that are not reserved to be stack ports, are considered to be network ports.
Link to the admin guide: http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/Sx500/administration_guide/500_Series_Admin_Guide.pdf
Page 74 is where this information is found and any additional information about the ports.
If you have any other question let us know.
Hope this helps,
Michael D.
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