I have several interfaces showing in an unknown state on my router. I went to try and remove it so I can add it back in the list resources, but I don't see it listed? It's labeled as fastethernet0/0 - fa0/0 in the interface list on the main node page. Could it be showing up as something else in the list resources? This seems to be happening pretty regularly to have an interface show up as unknow state. What could be causing this?