
SNMP Number Spaces

(last updated 2003-03-25)

There are three SNMP number spaces administered by IANA, one for
security models, another for message processing models, and a third
for SnmpEngineID formats [RFC2571, RFC3411].


Security Models

The SnmpSecurityModel TEXTUAL-CONVENTION values managed by IANA are in
the range from 0 to 255 inclusive, and are reserved for standards-
track Security Models.  If this range should in the future prove
insufficient, an enterprise number can be allocated to obtain an
additional 255 possible values.

There are several values of securityModel defined for use with SNMP or
reserved for use with supporting MIB objects.  They are as follows:

Value   Description                         References
-----   -----------                         ----------
  0     reserved for 'any'                  [RFC2571, RFC3411]
  1     reserved for SNMPv1                 [RFC2571, RFC3411]
  2     reserved for SNMPv2c                [RFC2571, RFC3411]
  3     User-Based Security Model (USM)     [RFC2571, RFC3411]


Message Processing Models

The SnmpMessageProcessingModel TEXTUAL-CONVENTION values managed by
IANA are in the range 0 to 255, inclusive.  Each value uniquely
identifies a standards-track Message Processing Model of the Message
Processing Subsystem within a SNMP Management Architecture.

Should this range prove insufficient in the future, an enterprise
number may be obtained for the standards committee to get an
additional 256 possible values.

There are several values of messageProcessingModel defined for use
with SNMP.  They are as follows:

Value  Description                             References
-----  -----------                             ----------
  0	   reserved for SNMPv1                     [RFC2571, RFC3411]
  1	   reserved for SNMPv2c                    [RFC2571, RFC3411]
  2	   reserved for SNMPv2u and SNMPv2*        [RFC2571, RFC3411]
  3	   reserved for SNMPv3                     [RFC2571, RFC3411]


SnmpEngineID Formats

The SnmpEngineID TEXTUAL-CONVENTION's fifth octet contains a format
identifier.  The values managed by IANA are in the range 6 to 127, 
inclusive.  Each value uniquely identifies a standards-track 
SnmpEngineID format.


References
----------

[RFC2571]  Harrington, D., et al., "An Architecture for Describing SNMP
           Management Frameworks", RFC 2571, April 1999.

[RFC3411]  D. Harrington, R. Presuhn, and B. Wijnen, "An Architecture for 
           Describing SNMP Management Frameworks", RFC 3411, December 2002.

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