1Network Management 2School of BusinessEastern Illinois University © Abdou Illia, Spring 2007(Week 16, Thursday 4/19/2007)2Learning Objectives List main elements in Centralized network management Describe Centralized Network Management principles Describe Manager-Agent communications3Centralized network management ? Remotely managing a network from a central point (for example a PC) :– Gathering data about network performance– Fine-tuning network performance– Diagnosing problems– Fixing problems– Controlling security– Etc. Centralized network management is possible with:– Managed networking components, and– Communication systems based on Network management protocols24Managed networking component ? Managed Networking components– Have objects that can be managed remotely– Include software components that gather data about their operation. Managed networking components can be printers, hubs, switches, routers, application programs, etc. Managed SwitchObjectPropertyPort 1Port 2Port 3ValueStatusStatusStatusOnOnOffSoftware components inside5Centralized network managementNetwork ManagementSoftware (Manager)RMON device The Manager (an application program) is used to communicate with managed components. The RMON is a stand-alone device or a software running in a switch or a router The RMON collects data on network trafficSwitch* RMON = Remote Monitoring6Centralized network managementNetwork ManagementSoftware (Manager)NetworkManagementAgent (Agent)RMON deviceNetworkManagementAgent (Agent) The Agents (software programs) acts on behalf of managed device The Manager doesn’t communicate with the managed device, but rather with its Agent37Centralized network managementManagementInformationBase (MIB)ManagementInformationBase (MIB)ManagementInformationBase (MIB)Network ManagementSoftware (Manager)RMON device The MIB is a data base on objects and their characteristics (properties, etc.) There is a small MIB on managed deviceThere is a complete MIB on the manager’s computer.8Centralized network managementManagementInformationBase (MIB)ManagementInformationBase (MIB)ManagementInformationBase (MIB)Network ManagementSoftware (Manager)Simple NetworkManagement Protocol (SNMP)RMON deviceCommand (Get, Set)ResponseTrap9Summary Questions (Part 1)1) List the main elements in centralized network management 2) Does the Manager communicate directly with the managed devices? Explain.3) Explain the difference between a managed device and objects.4) Where is the MIB (database) stored?410Manager-Agent communicationsNetworkManagementAgent (Agent)Network ManagementSoftware (Manager)Simple NetworkManagement Protocol (SNMP) Communication between the Manager and Agents works through command-response cycles The Manager sends a command The Agent sends back a response11Manager-Agent communicationsNetworkManagementAgent (Agent)Network ManagementSoftware (Manager)Get commands tell the Agent to retrieve certain information and return this information to the Manager.Example: Get status of port 1 and 2 on the switchSet commands tell the Agent to set a parameter (a property of an object) on the managed device.Example: Set the status of Port 2 on the switch to “off”.Command (Get, Set)12Manager-Agent communicationsNetworkManagementAgent (Agent)Network ManagementSoftware (Manager)Sometimes Agents do not wait for commands to send information If the Agent detects a condition the Manager should know about, it can send a Trap message to the ManagerTrap513Summary Questions (Part 2)1) In Manager-Agent communications, which device creates commands? Responses? Traps? 2) Explain the two types of commands.3) What is a
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