Appendix C SNMP Management

LRS-24Installation and Operation Manual

 

 

GetNextRequest Command for retrieving sequentially specific management information from the managed entity. The managed entity responds with a getResponse message.

SetRequest

Command for manipulating specific management information within the

 

managed entity. The managed entity responds with a setResponse

 

message.

Trap

Management message carrying unsolicited information on extraordinary

 

events, e.g., alarms, reported by the managed entity.

The Management Information Base

The Management Information Base (MIB) includes a collection of managed objects. A managed object is defined as a parameter that can be managed, such as a performance statistics value.

MIB includes the definitions of relevant managed objects. Various MIBs can be defined for various management purposes, types of equipment, etc.

An object's definition includes the range of values and the “access” rights:

Read-onlyObject value can be read, but cannot be set

Read-writeObject value can be read or set

Write-onlyObject value can be set, but cannot be read

Not accessible Object value can be neither read nor set

MIB Structure

MIB has an inverted tree-like structure, with each definition of a managed object forming one leaf, located at the end of a branch of that tree. A unique path reaches each leaf in the MIB. Therefore, by numbering the branching points from the top, each leaf can be uniquely defined by a sequence of numbers. The formal description of the managed objects and the MIB structure is provided in a special standardized format, called Abstract Syntax Notation 1 (ASN.1).

Since the general collection of MIBs can also be organized in a similar structure, under the supervision of the Internet Activities Board (IAB), any parameter included in a MIB that is recognized by the IAB is uniquely defined.

To provide the flexibility necessary in a global structure, MIBs are classified in various classes (branches), one of them being the experimental branch, and another the group of private (enterprise-specific) branches. Under the private enterprise-specific branch of MIBs, each enterprise (manufacturer) can be assigned a number, which is its enterprise number. The assigned number designates the top of an enterprise-specific sub-tree of non-standard MIBs. Within this context, RAD has been assigned the enterprise number 164. Therefore, enterprise MIBs published by RAD can be found under 1.3.6.1.4.1.164.

MIBs of general interest are published by the IAB in the form of a

Request for Comment (RFC) document. In addition, MIBs are also often assigned informal names that reflect their primary purpose. Enterprise-specific MIBs are published and distributed by their originator, which is responsible for their contents.

C-2

SNMP Environment

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RAD Data comm LRS-24 operation manual Management Information Base, MIB Structure