RFC 1418 (rfc1418) - Page 2 of 4

SNMP over OSI

RFC 1418                     SNMP over OSI                    March 1993


   heterogeneous transport environment, a managed agent should support
   more than one mapping.

2.  Mapping onto the CLTS

   Mapping the SNMP onto the CLTS [7,8] is straight-forward.  The
   elements of procedure are identical to that of using the UDP.  Note
   that the CLTS and the service offered by the UDP both transmit
   packets of information which contain full addressing information.
   Thus, mapping the SNMP onto the CLTS, a "transport address" in the
   context of [1], is simply a transport-selector and network address.

   It should be noted that the mapping of SNMP onto a connectionless-
   mode transport service is wholly consistent with SNMP's architectural
   principles, as described in [1,5].  However, the CLTS itself can be
   realized using either a connectionless-mode or a connection-oriented
   network service.  The mapping described in this mapping allows for
   either realization.  (When both network services are available, the
   CLNS should be used as the basis of realization.)

2.1.  Well-known Addresses

   Unlike the Internet suite of protocols, OSI does not use well-known
   ports.  Rather,
    demultiplexing occurs on the basis of "selectors", opaque strings of
   octets which have local significance.  In order to foster
   interoperable implementations of the SNMP over the CLTS, it is
   necessary define four selectors for this purpose.

   When the CLTS is used to provide the transport backing for the SNMP,
   and the CLTS uses a connectionless-mode network service, then
   transport selector used shall be "snmp-l" which consists of six ASCII
   characters; and, SNMP traps are, by convention, sent to an SNMP
   manager listening on the transport selector "snmpt-l" which consists
   of seven ASCII characters.

   When the CLTS is used to provide the transport backing for the SNMP,
   and the CLTS uses a connection-oriented network service, then
   transport selector used shall be "snmp-o" which consists of six ASCII
   characters; and, SNMP traps are, by convention, sent to an SNMP
   manager listening on the transport selector "snmpt-o" which consists
   of seven ASCII characters.

2.2.  Traps

   When SNMP traps are sent over the CLTS, the agent-addr field in the
   Trap-PDU contains the IP-address "0.0.0.0" An SNMP manager may
   ascertain the source of the trap based on information provided by the



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