![]() ![]() ![]() The PDU contains a request ID field, which was used for the same purpose in SNMPv1 and SNMPv2c, but since SNMPv3 allows for encrypted PDUs, the MessageID is in the (unencrypted) header. So, if a manager sends a GetRequest with MessageID x, then it is important that the manager does not re-use x until the outstanding message is answered or timed out. The MessageID is a number used between two entities for message correlation. A value of 2 indicates SNMPv2c and a value of 1 indicates SNMPv1. A value of 3 in this field indicates an SNMPv3 message. This provides for backwards and forwards compatibility. This is located in the same position for all versions of SNMP to allow differentiation during message processing. The first field in the message is the SNMP version. We describe the SNMPv3 message fields in the following sections. So, from Figure 2-1, the first field in the message is MessageVersion, the next field is MessageID, and so on. The format used for SNMPv3 messages follows a left-to-right and top-to-bottom pattern. īoth the context and PDU areas are either encrypted or in plain text. Security model data : This area has three subsections ”one general, one for authentication, and one for privacy data.Ĭontext : These two fields are used to provide the correct context in which the protocol data unit (PDU) should be processed. The message format is broken down into four overall sections made up of the following:Ĭommon data : These fields occur in all SNMPv3 messages. RFC 2572 contains the SNMPv3 message format specification an extract is illustrated in Figure 2-1. ![]()
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