There are switches that can do routing - called 元 switches (actually an oxymoron), and there are routers which understand vlans, and actually switch the traffic. Now, you have all right to be confused as all above is actually not true any more and the "switch - router" demarcation line is blurry. On the other side on a true pedigree "Switch" (like Cisco Catalyst 2950) you can do things above, but cannot assign IPs to interfaces like Fa0/1, cannot configure routing protocols etc. That is what the "Switches" suppose to be for. The "router" is suppose to be "routing" the traffic and not "switching" the traffic. For example until recently there were no global "vlans" on any Cisco "Router", no spanning-tree, and obviously no switchports. So the story is that due to historical reasons Cisco 7200 is "Router" and not a "Switch" and therefore does not behave like a switch. Sometimes seeing how other people think forces you to think out-of-box. You definitively made my day with this one.
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