don't use any switch in the middle. Just patch from one patch panel location building_A_incoming_fiber to the corresponding outgoing patch panel location Datacentre_fiber_out . Often these operations are referred as "loop" because you do not terminate the fiber on an active device but you loop it back to another fiber. As above mentioned, if your patch panel is passive (does not refresh the signal) you need to count the total distance and to compare to the type of MM fiber you are using .
I know the basics for Cisco routers and switches but what I want to know is, if I set up VTP on a switch, is there a way to send it through routers to other switches? This will probably end up more hassle than gain, but it's interesting and cool to p...