P2302R-P1C Support Notes
∙Get
Allows the NMS to retrieve an object variable from the agent.
∙GetNext
Allows the NMS to retrieve the next object variable from a table or list within an agent. In SNMPv1, when a NMS wants to retrieve all elements of a table from an agent, it initiates a Get operation, followed by a series of GetNext operations.
∙Set
Allows the NMS to set values for object variables within an agent.
∙Trap
Used by the agent to inform the NMS of some events.
The SNMPv1 message contains two parts. The first part contains a version and a community name. The second part contains the actual SNMP protocol data unit (PDU) specifying the operation to be performed (Get, Set, and so on) and the object values involved in the operation. The following figure shows the SNMPv1 message format.
The SNMP PDU contains the following fields:
∙PDU type Specifies the type of PDU.
∙Request ID Associates requests with responses.
∙Error status Indicates an error and an error type.
∙Error index Associates the error with a particular object variable.
45
All contents Copyright © 2007 ZyXEL Communications Corporation.
