The TCP/IP Guide - SNMP Version 2 (SNMPv2) Message Formats

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The TCP/IP Guide
9 TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9 TCP/IP Network Configuration and Management Protocols (BOOTP, DHCP, SNMP and RMON)
           9 TCP/IP Network Management Framework and Protocols (SNMP and RMON)
                9 TCP/IP Simple Network Management Protocol (SNMP) Protocol
                     9 SNMP Protocol Messaging and Message Formats

SNMP Version 1 (SNMPv1) Message Format

SNMP Version 3 (SNMPv3) Message Format

SNMP Version 2 (SNMPv2) Message Formats
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SNMP Version 2 (SNMPv2p) Message Format

The party-based security model is quite complex, but the basic messaging in this version is described through the definition of a management communication, which describes the source and destination party and makes reference to a context for the communication. The overall message format is described in detail in RFC 1445. This information is summarized in Table 215 and shown graphically in Figure 280.

**Table 215: SNMP Version 2 (SNMPv2p) General Message Format**
Field Name	Syntax	Size (bytes)	Description
*Version*	Integer	4	*Version Number:* Describes the SNMP version number of this message; used for ensuring compatibility between versions. For SNMPv2p, this value is 2.
*Dst Party*	Sequence of Integer	Variable	*Destination Party:* An object identifier that specifies the party that is the intended recipient of the message.
*Src Party*	Sequence of Integer	Variable	*Source Party:* An object identifier that specifies the party that is the sender of the message.
*Context*	Sequence of Integer	Variable	*Context:* Defines a set of MIB object resources that is accessible by a particular entity.
*PDU*	—	Variable	*PDU:* The protocol data unit of the message.

**Figure 280: SNMP Version 2 (SNMPv2p) General Message Format**

SNMP Version 1 (SNMPv1) Message Format

SNMP Version 3 (SNMPv3) Message Format

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