The accompanying visual illustrates the comparatively simple nature of a centralized configuration. All devices report their network management information directly to the network management station This occurs on a network-wide basis, so the central station has the only copy of the database. Many types of devices might be involved, including such diverse sources as routers, servers, modems, and components of the network operating system. There is no communication between the managed devices, so if the network management station should fail, there will be no management. In this case, each device may hold its network management data as long as possible before discarding.
Though a centralized approach may seem archaic in an era of distributed computing, this is precisely the approach used to manage an individual local network, such as a LAN.
NetView/390, IBM’s mainframe-based network management product, also conforms to this model. For network management every SNA device within the network reports directly to the NetView/390 application in the host. It is not difficult to imagine the additional traffic load that this configuration places on the network.