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SMI Structure of Managed Information and ASN.1


SMI Stands for Structure of Management Information, which defines the rules for describing management information, using Abstract Syntax Notation One (ASN.1).
Structure of Management Information (SMI), an adapted subset of ASN.1, operates in Simple Network Management Protocol (SNMP) to define sets ("modules") of related managed objects in a Management Information Base (MIB).
SMI subdivides into three parts: module definitions, object definitions, and notification definitions.
Different b/w SMIv1 & V2 is, V2 support counter64, Similar to Counter32, except that the range is now (0 to 2e64 -1). This type may only be used when a 32-bit counter rollover could occur in less than an hour. Otherwise, the Counter32 type must be used.
It may only be used when backwards compatibility is not a requirement because this type is not available in SNMPv1.

Abstract Syntax Notation One (ASN.1) is an interface description language for defining data structures that can be serialized and deserialized in a standard, cross-platform way. It is broadly used in telecommunications and computer networking, and especially in cryptography.


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