The MX450 is a Meraki Router/Firewall, you can use Internet Port 2 to plug into your network. It will connect automatically, grabbing an IP via dhcp. No need for special configs on your existing switch port. When you see the bright "While/Blue" light on the status light of the meraki, then you should be able to see it on the dashboard. Make sure you have "Claimed" the device on your network using the S/N. PS- I would used Internet port 2 initially to connect it to your network, so that you can then configure a static IP on Internet Port 1.
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