Owner manual

50
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GetBulk -- New for SNMPv2. The GetBulk operation was added to make it easier to
acquire large amounts of related information without initiating repeated get-next
operations. GetBulk was designed to virtually eliminate the need for GetNext
operations.
Set -- Allows the NMS to set values for object instances within an agent.
Trap -- Used by the agent to asynchronously Inform the NMS of some event. The
SNMPv2 trap message is designed to replace the SNMPv1 trap message.
Inform -- New for SNMPv2. The Inform operation was added to allow one NMS to
send trap information to another.
SNMPv1 messages (packets) contain two parts1. 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 instances involved in the operation. Figure 3 illustrates the SNMPv1 message
format.
Figure 3: SNMP v1 Message Format
* Trap messages have a slightly different format; for information on this format,
consult the appropriate SNMP specification.
The version field is used to ensure that all network elements are running software
based on the same SNMP version. The community name assigns an access
environment for a set of NMSs using that community name. NMSs within the
community can be said to exist within the same administrative domain. Because
devices that do not know the proper community name are precluded from SNMP
operations, network management personnel also have used the community name as
a weak form of authentication.
The SNMP PDU has the following fields:
PDU type -- Specifies the type of PDU being transmitted.
Request-ID -- Associates requests with responses.