We have planned to put a redundant cores switch. We have configured HSRP for all the vlans. All the fiber uplinks from swithces placed at diferent floors are terminating on the primary switch. Now I want the backup fast ethernet copper links to be terminated to secondary switch. I fear if the situation might cause a loop for me. So wanted to know if any specific STP configuuration I need to do on the access level, primary and secondary switches. Attached is a diagram, which could give a better understanding of the situation. Let me know if any changes required.