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Table Of Contents  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

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SNMP Message Field Definitions, General Message Format and Message Sections
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SNMP Version 2 (SNMPv2) Message Formats
Next Topic/Section

SNMP Version 1 (SNMPv1) Message Format
(Page 3 of 3)

SNMPv1 Trap-PDU Format

Table 214 and Figure 279 show the special format for the SNMPv1 Trap-PDU:


Table 214: SNMP Version 1 (SNMPv1) Trap-PDU Format

Field Name

Syntax

Size (bytes)

Description

PDU Type

Integer (Enumerated)

4

PDU Type: An integer value that indicates the PDU type, which is 4 for a Trap-PDU message.

Enterprise

Sequence of Integer

Variable

Enterprise: An object identifier for a group, which indicates the type of object that generated the trap.

Agent Addr

NetworkAddress

4

Agent Address: The IP address of the SNMP agent that generated the trap. This is of course also in the IP header at lower levels but inclusion in the SNMP message format allows for easier trap logging within SNMP. Also, in the case of a multihomed host, this specifies the preferred address.

Generic Trap

Integer (Enumerated)

4

Generic Trap Code: A code value specifying one of a number of predefined “generic” trap types.

Specific Trap

Integer

4

Specific Trap Code: A code value indicating an implementation-specific trap type.

Time Stamp

TimeTicks

4

Time Stamp: The amount of time since the SNMP entity sending this message last initialized or reinitialized. Used to time stamp traps for logging purposes.

Variable Bindings

Variable

Variable

Variable Bindings: A set of name-value pairs identifying the MIB objects in the PDU. See the general message format topic for more on these bindings.



Figure 279: SNMP Version 1 (SNMPv1) Trap-PDU Format

 


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SNMP Message Field Definitions, General Message Format and Message Sections
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SNMP Version 2 (SNMPv2) Message Formats
Next Topic/Section

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