I have added actually 2 cisco catalyst 3500 XL series switches to our current Catalyst 3750 switch stack (in which we have 5 x 3750's in the stack). I was looking at the spanning-tree summary on one of the 3500's and it say that there are 27 ports in blocked mode. How can that be? Wouldn't any workstation connected to those blocked ports not have network access? Or is that not how it works? Also, something is not configured correctly, can someone enlighten me? Thanks!