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TNM Simple Network Management Protocol Description

The Tnm Tcl extension includes an implementation of the Simple Network Management Protocol (SNMP) which is used to monitor and control devices on the Internet. The Tnm extension supports SNMP version 1 (SNMPv1) as defined in RFC 1157, community based SNMP version 2 (SNMPv2c) as defined in RFC 1901, RFC 1905, RFC 1906 as well as SNMP version 3 (SNMPv3) as defined in RFC 2272 and RFC 2274

The Tcl commands described here follow the conventions defined in the SNMPv2/SNMPv3 standards. The differences between SNMPv1, SNMPv2c and SNMPv3 are hidden as far as possible from the user of this extension by applying automatic conversions where possible (RFC 2089).

All SNMP messages are sent or received by using so called SNMP sessions. SNMP sessions are lightweight objects that keep information about the transport address of the SNMP peer entity, the authentication mechanism and parameters in use as well as some parameters that control the behaviour of the SNMP protocol engine itself.

The Tnm extension supports four different SNMP session types that correspond to SNMP applications as defined in the architecture for describing SNMP management frameworks (RFC 2271). A “generator” SNMP session is used to initiate SNMP get/getnext/getbulk or set requests and a “listener” SNMP session is used to receive event notifications (either unacknowledged traps or acknowledged informs). “Generator” and “listener” SNMP sessions can be used to implement traditional SNMP manager.

A “responder” SNMP session receives incoming get/getnext/getbulk or set requests, processes them and returns response messages. Finally, “notifier” SNMP sessions allow sending notifications as either SNMP traps or informs. The combination of “responder” and “notifier” SNMP sessions is traditionally called an SNMP agent.
The SNMP commands described in this manual page are often used in combination with the Tnm::mib command, which allows retrieving information from Management Information Base (MIB) definitions. The implementation of the SNMP protocol engine also makes internal calls to the MIB module in order to resolve names or to apply conversions.
 


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This software is copyrighted by Juergen Schoenwaelder, the Technical University of Braunschweig, the University of Twente and other parties.  The following terms apply to all files associated with the software unless explicitly disclaimed in individual files.
The authors hereby grant permission to use, copy, modify, distribute, and license this software and its documentation for any purpose, provided that existing copyright notices are retained in all copies and that this notice is included verbatim in any distributions.  No written agreement, license, or royalty fee is required for any of the authorized uses.  Modifications to this software may be copy-righted by their authors and need not follow the licensing terms described here, provided that the new terms are clearly indicated on the first page of each file where they apply.
IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN “AS IS” BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGA-TION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 

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