ZyXEL Communications P-2602HWNLI Support Notes page 70

•
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 messages contains two part. 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
•
Error status
•
Error index
•
Variable-bindings
Associates requests with responses.
Indicates an error and an error type.
Associates the error with a particular object variable.
Associates particular object with their value.
All contents copyright (c) 2006 ZyXEL Communications Corporation.
P-2602HWNLI Support Notes
70