ZyXEL Communications P-2302RL-P1 Support Notes page 45


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

Error status

Error index
Associates requests with responses.
Indicates an error and an error type.
Associates the error with a particular object variable.
All contents Copyright  2007 ZyXEL Communications Corporation.
P2302RL-P1 Support Notes
45