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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
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SNMP Version 1 (SNMPv1) Message Format
(Page 2 of 3)

SNMPv1 PDU Formats

All of the PDUs in SNMPv1 have the same format, with one exception: Trap-PDU. The exact semantics of each field in the PDU depends on the particular message. For example, the ErrorStatus field only has meaning in a reply and not a request, and object values are used differently in requests and replies as well.

SNMPv1 Common PDU Format

Table 213 and Figure 278 show the common format for most of the SNMPv1 PDUs: GetRequest-PDU, GetNextRequest-PDU, SetRequest-PDU and GetResponse-PDU:


Table 213: SNMP Version 1 (SNMPv1) Common PDU Format

Field Name

Syntax

Size (bytes)

Description

PDU Type

Integer (Enumerated)

4

 

Request ID

Integer

4

Request Identifier: A number used to match requests with replies. It is generated by the device that sends a request and copied into this field in a GetResponse-PDU by the responding SNMP entity.

Error Status

Integer (Enumerated)

4

 

Error Index

Integer

4

Error Index: When Error Status is non-zero, this field contains a pointer that specifies which object generated the error. Always zero in a request.

Variable Bindings

Variable

Variable

Variable Bindings: A set of name-value pairs identifying the MIB objects in the PDU, and in the case of a SetRequest-PDU or GetResponse-PDU, containing their values. See the general message format topic for more on these bindings.



Figure 278: SNMP Version 1 (SNMPv1) Common PDU Format

 


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