Lecture 22: Network Management #2

SNMP Basic Data Types

The SNMP MIB is defined in terms of only a few basic (ie, their tag types is UNIVERSAL) ASN.1 object types: the

OBJECT
IDENTIFIER

, its associated

Object
Descriptor

, the INTEGER and the OCTET STRING

SNMP additionally defines some new data types for use in the management framework:

IpAddress

A data type representing an IP address:

IpAddress ::=
    [APPLICATION 0]
    IMPLICIT OCTET STRING (SIZE (4))

Counter

A data type representing a non-negative integer which monotonically increases until it reaches a maximum value when it wraps to zero.

Counter ::=
    [APPLICATION 1]
    IMPLICIT INTEGER (0..4292967295)

Gauge

A data type representing a non-negative integer which may increase or decrease, but which latches at a maximum value.

Gauge ::=
    [APPLICATION 2]
    IMPLICIT INTEGER (0..4292967295)

TimeTicks

hundredths of a second

Opaque

arbitrary encoding

Lecture 22: Network Management #2