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]. 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 Reference ----- ----------- --------- 0 reserved for 'any' [RFC2571] 1 reserved for SNMPv1 [RFC2571] 2 reserved for SNMPv2c [RFC2571] 3 User-Based Security Model (USM) [RFC2571] 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 Reference ----- ----------- --------- 0 reserved for SNMPv1 [RFC2571] 1 reserved for SNMPv2c [RFC2571] 2 reserved for SNMPv2u and SNMPv2* [RFC2571] 3 reserved for SNMPv3 [RFC2571] SnmpEngineID Formats The SnmpEngineID TEXTUAL-CONVENTION's fifth octet contains a format identifier. 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. People ------ []