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Glossary
- This is a glossary of terms used in the SunNet Manager documentation. Wherever possible, terms have meanings similar to standard usage within the network management community. Some definitions have been slightly modified to better illustrate unique SunNet Manager concepts.
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activity daemon
- Process that keeps a list of active agent requests that have been sent from the host where the daemon is running. The daemon periodically queries the agents to make sure they are still servicing their requests.
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agent
- A process, usually corresponding to a particular managed object, that carries out requests from a manager.
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agent schema
- A formatted description of the groups and attributes available from an agent, with an enumerated list of possible agent errors. This description enables manager processes to make requests for specific groups and attributes.
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agent services
- The function library that allows agents and managers to communicate, as viewed by the agent.
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API
- Application Programming Interface. The function library interface an application can call to perform a particular service.
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attribute
- A named data item corresponding to a property of a managed object.
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attribute name
- The name of an attribute as defined by the agent schema.
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bus
- A non point-to-point network type. Used by the MDB to represent a network link to which many other elements may connect.
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cluster
- A collection of records in the MDB which together represent an element. Cluster records are defined in instance files. Also called cluster record or instance record.
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component
- A type of network element corresponding to devices such as computers, operating systems, gateways, etc.
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connection
- A point-to-point network link connecting two other elements. Connections come in two types: regular and simple. Regular connections are full-fledged elements that can have properties, can be managed by agents, etc. Simple connections are a user-convenience feature that have a graphical representation but no database representation. (They don't have properties, can't be managed by agents, etc.)
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Console
- The window-based manager application that comes with SunNet Manager.
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control
- The ability to modify attribute values to change the characteristics of managed objects.
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data report
- Attributes routinely reported for analysis, as opposed to an event report.
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decay to blue
- The decay-to-blue feature pertains to events and traps that have reached a threshold and then fallen below it, or that have had an event or trap stop being reported. In response to these conditions, the glyph for the affected element turns blue.
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discover function
- Using this function, from the machine on which the SNM Console is running, the Discover Tool finds hosts, routers, networks, and Simple Network Management Protocol (SNMP) devices reachable from the Console machine.
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dispatch function
- Agent routine that calls an appropriate agent function to service a request.
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element
- An individual object subject to management. Examples: "the machine called mgrhost," "ethernet interface le0," "building 14," and so on.
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element type
- A structural definition of a particular kind of element. Examples: component.sun3, bus.ethernet, etc.
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element category
- A family of element types. The SunNet Manager Console defines four element categories: bus, component, connection and view.
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event
- The occurrence of a particular change in the state of an attribute.
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event dispatcher
- Process that acts as a rendezvous for event reports. Management applications can ask this daemon to send them selected copies of reports based on particular criteria.
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event report
- The notification an agent sends when an event is detected on a managed object.
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gateway
- A computer that interconnects two networks and routes packets from one to the other. A gateway has more than one network interface.
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glyph
- A pictorial representation. Similar to icon (except OPEN LOOK distinguishes between the two). The Console provides three forms of glyphs: the fixed-sized image (components, views and connections without both end elements in the current view), the variable length vector with grab handles (buses) and the variable length vector (connections with both end elements in the current view).
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group
- A collection of related attributes. Defined by the agent writer and specified in the agent schema.
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instance
- The data representing a particular element. As used by the MDB, definitions of instances are called instance records.
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instance file
- A collection of agent request and element instance records.
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managed object
- A particular resource (computer system, network interface, etc.) subject to management. In the Console this concept is called an element.
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MDB
- Management database. The collection of all managed object attribute definitions, along with data definitions specific to the SunNet Manager Console.
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manager
- The collection of programs or processes that work on behalf of a user to help manage a particular set of networks and devices. Usually sends requests to agents, accepts collected data from them, and displays the data for the user. Also called manager application or manager process.
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manager services
- The function library that allows agents and managers to communicate, as viewed by the manager.
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manager station
- The workstation where a human manages a particular set of networks and devices, usually running a manager application such snm(1) or snm_cmd(1).
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MIB
- Management Information Base. The logical representation of network devices and their components as managed objects.
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monitor function
- Using this function, the Discover Tool compares the elements stored in the runtime database with the elements it finds at a specified interval or specified time. If new elements are detected, the monitor function stores the elements in
- a "holding area" view and records these elements in a log file. Through the same log file, the monitor function can also notify you if a previously discovered host is down or was down within a given period.
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predefined request
- Provides the user with an easy and quick method of making network management calls from a manager to an agent process, usually to collect and return specific attribute values.
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proxy agent
- An agent that manages on behalf of the manager. Used to manage objects not directly manageable due to different protocol suites or other incompatibilities. Sometimes shortened to proxy.
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proxy system
- The host where a proxy agent runs.
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rendezvous
- Process where an agent sends data and event reports. Also known as rendezvous process.
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report
- Answer (usually from an agent to a manager) containing attribute values or error messages. Sometimes called response.
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request
- Network management call from a manager to an agent process, usually to collect and return specific attribute values.
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RPC
- Remote Procedure Call.
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schema
- A description of element structures and instances. While technically every file (except icons and rasterfiles) that the Console loads into the runtime database is a schema, in practice, records that define the structure of elements are called structure definitions, and records that define the actual elements are called instance records. The remaining schema records, used by agents to define their capabilities, are called agent schema.
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schema file
- A UNIX file containing one or more agent schema. Also called agent schema file.
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SNMP
- Simple Network Management Protocol, the standard network management protocol used in TCP/IP networks.
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SNMPv2
- Simple Network Management Protocol Version 2, an enhanced version of the standard network management protocol used in TCP/IP networks.
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stream
- A logical grouping of reports created according to the name of the requesting agent, type of report, and the request timestamp.
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structure file
- A collection of agent and element structure definitions.
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system
- An instance of a component. Sometimes called host or device.
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target system
- The host where the managed object resides.
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verify function
- Agent routine that checks the validity of a request before the request is dispatched.
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view
- A collection of components in the Console's MDB. Views have members, called elements. Since views are elements, they may be members of other views. Elements may have multiple memberships. Memberships may be circular.
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