Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

Get The TCP/IP Guide for your own computer.
The TCP/IP Guide

Custom Search







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

Previous Topic/Section
SNMP Message Field Definitions, General Message Format and Message Sections
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
SNMP Version 2 (SNMPv2) Message Formats
Next Topic/Section

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

 


Previous Topic/Section
SNMP Message Field Definitions, General Message Format and Message Sections
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
SNMP Version 2 (SNMPv2) Message Formats
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.