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There are 3 NICs in the Router1 and 24 available ports in the Switch1.
Is there any reason why I can't connect from Router1 to Switch1?
Apparently you can't connect more than 2 links.
The workaround is to add new gigabit ports to your routers.
The module name is NIM-ES2-4 (see picture).
Just drag and drop it to available slots.
Btw, you need to turn off the router, else you can't add the module.
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