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As a result , IT professionals must view the edge of the network as critical to effectively manage the delivery of information and applications . In addition , the control engine participates in all of the networking control protocols , including all Fibre Channel services . The key to this feature is the ability of the redundant Supervisor to de-couple the control and data plane during this failover . Quality , as usual , is the issue . What is surprising is the solid number of firms that survived the so-called consolidation . The Cisco Catalyst 4500 Series provides an ideal branch-office solution capable of meeting the needs of both small and large operations , as well as small-enterprise applications . Beyond meeting the basic requirements of nondisruptive software upgrades and redundancy of all critical hardware components , the Cisco MDS 9500 Series software architecture offers an unparalleled level of availability . A critical ability of any director-class Fibre Channel switch is the ability to load and activate new software on the switch without disrupting traffic across the SAN . In a multicast deployment , the Rendezvous point ( RP ) plays a critical role in defining and building a path through the network over which multicast traffic can traverse .