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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 1 2 3 4 5 6 SNMP Version 3 (SNMPv3) Message Format

User-Based SNMP Version 2 (SNMPv2u) Message Format

SNMPv2u was defined as an optional security model at the time that SNMPv2c was standardized. RFC 1910 defines the user-based security model and the message format described in Table 217 and Figure 282.

Table 217: User-Based SNMP Version 2 (SNMPv2u) 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 SNMPv2u, this value is 2. Note that this is the same value as used for SNMPv2p.
Parameters	Octet String	Variable
PDU	—	Variable	Protocol Data Unit: The PDU being communicated as the body of the message. This may be in either encrypted or unencrypted form.

Figure 282: User-Based SNMP Version 2 (SNMPv2u) General Message Format

SNMP Version 1 (SNMPv1) Message Format 1 2 3 4 5 6 SNMP Version 3 (SNMPv3) Message Format

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