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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.
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.
Data Type Code |
Description |
SMIv1? |
SMIv2? |
Integer / Integer32 |
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. |
Yes |
Yes |
Octet String |
A variable-length string of binary or text data. |
Yes |
Yes |
Null |
Nothing. |
Yes |
— |
Bits |
An enumeration of named bits. Used to allow a set of bit flags to be treated as a single data type. |
— |
Yes |
Unsigned |
A 32-bit unsigned integer, from 0 to 4,294,967,295. |
— |
Yes |
Network Address / IpAddress |
An IP address, encoded as a 4-byte octet string. |
Yes |
Yes |
Counter / Counter32 |
A 32-bit unsigned integer, that begins at 0 and increases up to 4,294,967,295, then wraps back to 0. |
Yes |
Yes |
Gauge / Gauge32 |
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 |
Yes |
TimeTicks |
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. |
Yes |
Yes |
Opaque |
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. |
Yes |
Yes |
Counter64 |
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
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