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With the MDS 9500 Series , Cisco Systems delivers the most comprehensive toolset for troubleshooting and analysis of storage networks . The use of Firewalls , Intrusion Prevention and Detection devices often spring to mind as the first line of defense . No communication is possible between devices in different VSANs except where explicitly allowed through the use of Inter-VSAN Routing . To protect against this scenario , the use of Route Dampening can be put into effect . This need for physical security is addressed by switches in the Cisco MDS 9000 Family . The use of VLAN 's lends itself to the switch architecture , which along with the firewalls and load balancers is VLAN aware and use VLAN technology to segregate server farms . Director-class Fibre Channel switches bring a new level of availability to the storage network . In addition to hardware redundancy , the Cisco MDS 9500 Series provides highly resilient software with an innovative high-availability feature set designed to eliminate downtime in the storage network . The use of these modules in a Data Center allows different user groups to virtualize an instance of that service module which , in turn , allows the creation of an operational configuration tuned to the specific requirements of that group . So , whether using a 3rd party application , or writing custom in-house applications to manage the storage network , the detailed device and topology information that can be gathered via these FC-GS-4 related MIBs allows the user to accurately create and audit a fabric topology and its registrants .