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TCP/IP MIB Objects, Object Characteristics and Object Types
(Page 3 of 4)
SMIv2 MIB Object Optional Characteristics
SMIv2 adds the following optional
characteristics that may appear in the definition of an object:
- Units: A text description of the units
associated with the object.
- Reference: A text cross-reference to a
related document or other information of relevance to the object.
- Index: A value used to define objects
that are actually more complex rows of other objects.
- Augments: An alternative to the Index
field.
- DefVal: Defines an acceptable default
value for the object.
SMI Regular Data Types
Table 206
shows the regular data types supported for objects in both SMIv1 and
SMIv2. (The names with 32 in them are the ones used in SMIv2;
they were changed to make the type's bit size explicit.) The first five
entries in the table are primitive types, the rest are defined types,
using the SMIv1 terminology.
Table 206: SNMP SMI Regular Data Types
Data Type
Code
|
Description
|
SMIv1?
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SMIv2?
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Integer
/ Integer32
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A 32-bit signed integer in two's
complement notation, capable of holding a value from -2,147,483,648
to +2,147,483,647. Can also be used to represent an enumerated type;
for example, where 1 represents a particular constant, 2 represents
a different one, and so on.
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Yes
|
Yes
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Octet
String
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A variable-length
string of binary or text data.
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Yes
|
Yes
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Null
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Nothing.
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Yes
|
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Bits
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An enumeration
of named bits. Used to allow a set of bit flags to be treated as a single
data type.
|
|
Yes
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Unsigned
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A 32-bit unsigned integer, from
0 to 4,294,967,295.
|
|
Yes
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Network
Address / IpAddress
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An IP address,
encoded as a 4-byte octet string.
|
Yes
|
Yes
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Counter
/ Counter32
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A 32-bit unsigned integer, that
begins at 0 and increases up to 4,294,967,295, then wraps back to 0.
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Yes
|
Yes
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Gauge
/ Gauge32
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A 32-bit unsigned
integer, that may have a value from 0 to 4,294,967,295 and may increase
or decrease, like a gauge. A minimum and maximum value are associated
with the gauge, indicating its normal range.
|
Yes
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Yes
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TimeTicks
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A 32-bit unsigned integer that
indicates the number of hundredths of seconds since some arbitrary start
date. Used for timestamping and to compute elapsed time.
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Yes
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Yes
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Opaque
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Data using
arbitrary ASN.1 syntax that is to be passed between devices without
being interpreted. As in NFS's XDR,
the term opaque means that the data is treated like a black
box whose internal details cannot be seen.
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Yes
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Yes
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Counter64
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A counter like Counter32 but
64 bits wide, allowing a value from 0 to 18,446,744,073,709,551,615.
|
|
Yes
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Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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