Is it possible to block outbound traffic on a layer 2 interface? While still allowing incoming traffic? If so, which commands would I use?
In essence, I want to place two ports on the same VLAN, where one port accepts traffic and the other sends traffic.
It can be done using this command
switchport unicast unicast suppression level
And the same for multicast and broadcast, but not sure why do you want to do that? And i believe it is not gonna work. You need to keep STP in you mind and it will block one of the ports
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If I understand what you'll want to make, I recommend you read about "PRIVATE VLANS", it could be whatever you're looking for.
In this way you could separate ports in different vlans without worrying about STP.