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2. Definitions Connected: An Internet Encyclopedia
2. Definitions

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2. Definitions

2. Definitions

SNMPv2-SMI DEFINITIONS ::= BEGIN

-- the path to the root

org            OBJECT IDENTIFIER ::= { iso 3 }
dod            OBJECT IDENTIFIER ::= { org 6 }
internet       OBJECT IDENTIFIER ::= { dod 1 }

directory      OBJECT IDENTIFIER ::= { internet 1 }

mgmt           OBJECT IDENTIFIER ::= { internet 2 }
mib-2          OBJECT IDENTIFIER ::= { mgmt 1 }
transmission   OBJECT IDENTIFIER ::= { mib-2 10 }

experimental   OBJECT IDENTIFIER ::= { internet 3 }

private        OBJECT IDENTIFIER ::= { internet 4 }
enterprises    OBJECT IDENTIFIER ::= { private 1 }

security       OBJECT IDENTIFIER ::= { internet 5 }

snmpV2         OBJECT IDENTIFIER ::= { internet 6 }

-- transport domains
snmpDomains    OBJECT IDENTIFIER ::= { snmpV2 1 }

-- transport proxies
snmpProxys     OBJECT IDENTIFIER ::= { snmpV2 2 }

-- module identities
snmpModules    OBJECT IDENTIFIER ::= { snmpV2 3 }

-- definitions for information modules


MODULE-IDENTITY MACRO ::=
BEGIN
    TYPE NOTATION ::=
                  "LAST-UPDATED" value(Update UTCTime)
                  "ORGANIZATION" Text
                  "CONTACT-INFO" Text
                  "DESCRIPTION" Text
                  RevisionPart

    VALUE NOTATION ::=
                  value(VALUE OBJECT IDENTIFIER)

    RevisionPart ::=
                  Revisions
                | empty
    Revisions ::=
                  Revision
                | Revisions Revision
    Revision ::=
                  "REVISION" value(Update UTCTime)
                  "DESCRIPTION" Text

    -- uses the NVT ASCII character set
    Text ::= """" string """"
END

OBJECT-IDENTITY MACRO ::=
BEGIN
    TYPE NOTATION ::=
                  "STATUS" Status
                  "DESCRIPTION" Text
                  ReferPart

    VALUE NOTATION ::=
                  value(VALUE OBJECT IDENTIFIER)

    Status ::=
                  "current"
                | "deprecated"
                | "obsolete"

    ReferPart ::=
                "REFERENCE" Text
              | empty

    Text ::= """" string """"
END


-- names of objects


ObjectName ::=
    OBJECT IDENTIFIER

NotificationName ::=
    OBJECT IDENTIFIER



-- syntax of objects


ObjectSyntax ::=
    CHOICE {
        simple
            SimpleSyntax,

          -- note that SEQUENCEs for conceptual tables and
          -- rows are not mentioned here...

        application-wide
            ApplicationSyntax
    }


-- built-in ASN.1 types


SimpleSyntax ::=
    CHOICE {
        -- INTEGERs with a more restrictive range
        -- may also be used
        integer-value               -- includes Integer32
            INTEGER (-2147483648..2147483647),

        -- OCTET STRINGs with a more restrictive size
        -- may also be used
        string-value
            OCTET STRING (SIZE (0..65535)),

        objectID-value
            OBJECT IDENTIFIER
    }

-- indistinguishable from INTEGER, but never needs more than
-- 32-bits for a two's complement representation
Integer32 ::=
    [UNIVERSAL 2]
        IMPLICIT INTEGER (-2147483648..2147483647)


-- application-wide types


ApplicationSyntax ::=
    CHOICE {
        ipAddress-value
            IpAddress,

        counter-value
            Counter32,

        timeticks-value
            TimeTicks,

        arbitrary-value
            Opaque,

        big-counter-value
            Counter64,

        unsigned-integer-value  -- includes Gauge32
            Unsigned32
    }

-- in network-byte order
-- (this is a tagged type for historical reasons)
IpAddress ::=
    [APPLICATION 0]
        IMPLICIT OCTET STRING (SIZE (4))

-- this wraps
Counter32 ::=
    [APPLICATION 1]
        IMPLICIT INTEGER (0..4294967295)

-- this doesn't wrap
Gauge32 ::=
    [APPLICATION 2]
        IMPLICIT INTEGER (0..4294967295)

-- an unsigned 32-bit quantity
-- indistinguishable from Gauge32
Unsigned32 ::=
    [APPLICATION 2]
        IMPLICIT INTEGER (0..4294967295)

-- hundredths of seconds since an epoch
TimeTicks ::=
    [APPLICATION 3]
        IMPLICIT INTEGER (0..4294967295)

-- for backward-compatibility only
Opaque ::=
    [APPLICATION 4]
        IMPLICIT OCTET STRING

-- for counters that wrap in less than one hour with only 32 bits
Counter64 ::=
    [APPLICATION 6]
        IMPLICIT INTEGER (0..18446744073709551615)


-- definition for objects


OBJECT-TYPE MACRO ::=
BEGIN
    TYPE NOTATION ::=
                  "SYNTAX" Syntax
                  UnitsPart
                  "MAX-ACCESS" Access
                  "STATUS" Status
                  "DESCRIPTION" Text
                  ReferPart
                  IndexPart
                  DefValPart

    VALUE NOTATION ::=
                  value(VALUE ObjectName)

    Syntax ::=
                  type(ObjectSyntax)
                | "BITS" "{" Kibbles "}"
    Kibbles ::=
                  Kibble
                | Kibbles "," Kibble
    Kibble ::=
                 identifier "(" nonNegativeNumber ")"

    UnitsPart ::=
                  "UNITS" Text
                | empty

    Access ::=
                  "not-accessible"
                | "accessible-for-notify"
                | "read-only"
                | "read-write"
                | "read-create"

    Status ::=
                  "current"
                | "deprecated"
                | "obsolete"

    ReferPart ::=
                  "REFERENCE" Text
                | empty

    IndexPart ::=
                  "INDEX"    "{" IndexTypes "}"
                | "AUGMENTS" "{" Entry      "}"
                | empty
    IndexTypes ::=
                  IndexType
                | IndexTypes "," IndexType
    IndexType ::=
                  "IMPLIED" Index
                | Index
    Index ::=
                    -- use the SYNTAX value of the
                    -- correspondent OBJECT-TYPE invocation
                  value(Indexobject ObjectName)
    Entry ::=
                    -- use the INDEX value of the
                    -- correspondent OBJECT-TYPE invocation
                  value(Entryobject ObjectName)

    DefValPart ::=
                  "DEFVAL" "{" value(Defval Syntax) "}"
                | empty

    -- uses the NVT ASCII character set
    Text ::= """" string """"
END


-- definitions for notifications


NOTIFICATION-TYPE MACRO ::=
BEGIN
    TYPE NOTATION ::=
                  ObjectsPart
                  "STATUS" Status
                  "DESCRIPTION" Text
                  ReferPart

    VALUE NOTATION ::=
                  value(VALUE NotificationName)

    ObjectsPart ::=
                  "OBJECTS" "{" Objects "}"
                | empty
    Objects ::=
                  Object
                | Objects "," Object
    Object ::=
                  value(Name ObjectName)

    Status ::=
                  "current"
                | "deprecated"
                | "obsolete"

    ReferPart ::=
                "REFERENCE" Text
              | empty

    -- uses the NVT ASCII character set
    Text ::= """" string """"
END


-- definitions of administrative identifiers


zeroDotZero    OBJECT-IDENTITY
    STATUS     current
    DESCRIPTION
            "A value used for null identifiers."
    ::= { 0 0 }

END


Next: 3. Information Modules

Connected: An Internet Encyclopedia
2. Definitions

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