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Many of these approaches blur the boundaries between SAN security , best-practice SAN design , and high-availability SAN design , but all are important from the perspective that a correctly configured , secure switch can help prevent both deliberate and unintentional disruptions . No new features or functions are added to the major release after it achieves general deployment status . The Cisco Catalyst 3560 Series is equipped with a robust set of features that allow for network scalability and higher availability through IP routing as well as a complete suite of Spanning Tree Protocol enhancements aimed to maximize availability in a Layer 2 network . For more information about OSMs , see the following data sheets . The Remote SPAN ( RSPAN ) feature enables ability to remotely monitor traffic for one or more SPAN sources distributed in one or more source switches in a Fibre Channel fabric . Within the Cisco MDS 9000 Family switches , AAA can be used to centralize the user accounts for the switches . The Cisco MDS 9509 Multilayer Director layers intelligent features onto a high performance core to provide uncompromising high availability , security , scalability , ease of management , and seamless integration of new technologies . In the rare event that a supervisor module is reset , complete synchronization between the active and standby supervisors ensures stateful failover with no disruptions to traffic . These upgrades might be to fix software bugs or add new features . Figure 6 shows these three windows . In those switches using redundant Supervisors , now both Unicast and Multicast traffic flows can continue to be switched in the event of a Supervisor Failover . Few or no new features or functions , which can be potentially destabilizing , are added to the maintenance release .