rfc1161.txt

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RFC 1161                     SNMP over OSI                     June 1990


   consists of establishing a transport connection, sending one or more
   SNMP messages on that connection, and then releasing the transport
   connection.

   Consistent with the SNMP model, the initiator of a connection should
   not require that responses to a request be returned on that
   connection.  However, if a responder to a connection sends SNMP
   messages on a connection, then these MUST be in response to requests
   received on that connection.

   Ideally, the transport connection SHOULD be released by the
   initiator, however, note that the responder may release the
   connection due to resource limitations.  Further note, that the
   amount of time a connection remains established is implementation-
   specific.  Implementors should take care to choose an appropriate
   dynamic algorithm.

   Also consistent with the SNMP model, the initiator should not
   associate any reliability characteristics with the use of a
   connection.  Issues such as retransmission of SNMP messages, etc.,
   always remain with the SNMP application, not with the transport
   service.

4.1.  Addressing Conventions

   Unlike the Internet suite of protocols, OSI does not use well-known
   ports.  Rather demultiplexing occurs on the basis of "selectors",
   which are opaque strings of octets, which have meaning only at the
   destination.  In order to foster interoperable implementations of the
   SNMP over the COTS, it is necessary define a selector for this
   purpose.  However, to be consistent with the various connectivity-
   services, different conventions, based on the actual underlying
   service, will be used.

4.1.1.  Conventions for TP4/CLNP-based service

   When a COTS based on the TP4/CLNP is used to provide the transport
   backing for the SNMP, demultiplexing will occur on the basis of
   transport selector.  The transport selector used shall be the four
   ASCII characters

                                   snmp

   Thus, using the string encoding of [7], such addresses may be
   textual, described as:

                             "snmp"/NS+<nsap>




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RFC 1161                     SNMP over OSI                     June 1990


   where:

   (1)  <nsap> is a hex string defining the nsap, e.g.,

                     "snmp"/NS+4900590800200038bafe00

   Similarly, SNMP traps are, by convention, sent to a manager listening
   on the transport selector

                                 snmp-trap

   which consists of nine ASCII characters.

4.1.2.  Conventions for TP0/X.25-based service

   When a COTS based on the TP0/X.25 is used to provide the transport
   backing for the SNMP, demultiplexing will occur on the basis of X.25
   protocol-ID.  The protocol-ID used shall be the four octets

                                 03018200

   Thus, using the string encoding of [7], such addresses may be textual
   described as:

                        Int-X25=<dte>+PID+03018200

   where:

   (1)  <dte> is the X.121 DTE, e.g.,

                    Int-X25=23421920030013+PID+03018200

   Similarly, SNMP traps are, by convention, sent to a manager listening
   on the protocol-ID

                                 03019000

5.  Acknowledgements

   This document was produced by the SNMP Working Group:

         Karl Auerbach, Epilogue Technology
         David Bridgham, Epilogue Technology
         Brian Brown, Synoptics
         John Burress, Wellfleet
         Jeffrey D. Case, University of Tennessee at Knoxville
         James R. Davin, MIT-LCS
         Mark S. Fedor, PSI, Inc.



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RFC 1161                     SNMP over OSI                     June 1990


         Stan Froyd, ACC
         Satish Joshi, Synoptics
         Ken Key, University of Tennessee at Knoxville
         Gary Malkin, FTP Software
         Randy Mayhew, University of Tennessee at Knoxville
         Keith McCloghrie, Hughes LAN Systems
         Marshall T. Rose, PSI, Inc. (chair)
         Greg Satz, cisco
         Martin Lee Schoffstall, PSI, Inc.
         Bob Stewart, Xyplex
         Geoff Thompson, Synoptics
         Bill Versteeg, Network Research Corporation
         Wengyik Yeong, PSI, Inc.

6.  References

  [1]  Case, J., Fedor, M., Schoffstall, M., and J. Davin, "A Simple
       Network Management Protocol (SNMP)", RFC 1157, SNMP Research,
       Performance Systems International, Performance Systems
       International, and MIT Laboratory for Computer Science, May 1990.

  [2]  Rose M., and K. McCloghrie, "Structure and Identification of
       Management Information for TCP/IP-based internets", RFC 1155,
       Performance Systems International, Hughes LAN Systems, May 1990.

  [3]  McCloghrie K., and M. Rose, "Management Information Base for
       Network Management of TCP/IP-based internets", RFC 1156, Hughes
       LAN Systems, Performance Systems International, May 1990.

  [4]  Information Processing Systems - Open Systems Interconnection,
       "Transport Service Definition", International Organization for
       Standardization, International Standard 8072, June 1986.

  [5]  Information Processing Systems - Open Systems Interconnection,
       "Transport Service Definition - Addendum 1: Connectionless-mode
       Transmission", International Organization for Standardization,
       International Standard 8072/AD 1, December 1986.

  [6]  Postel, J., "User Datagram Protocol", RFC 768, USC/Information
       Sciences Institute, November 1980.

  [7]  Kille, S., "A String Encoding of Presentation Address", Research
       Note RN/89/14, Department of Computer Science, University College
       London, February 1989.

  [8]  Case, J., Davin, J., Fedor, M., and M. Schoffstall, "Network
       Management and the Design of SNMP", ConneXions (ISSN 0894-5926),
       Volume 3, Number 3, March 1989.



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RFC 1161                     SNMP over OSI                     June 1990


7.  Security Considerations

   Security issues are not discussed in this memo.

8.  Author's Address

   Marshall T. Rose
   PSI, Inc.
   PSI California Office
   P.O. Box 391776
   Mountain View, CA 94039

   Phone: [phone]

   Email: [e-mail]




































IETF SNMP Working Group                                         [Page 8]