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A MIB (Management Information Base) is a structured document that defines the data a device exposes over SNMP — things like interface counters, system uptime, or CPU load. Each module declares a set of named objects, organized into a tree.

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An OID (Object Identifier) is the numeric address of one piece of data in a MIB — a dotted sequence like 1.3.6.1.2.1.1.1, read from the root of a global tree down to one specific object. Names are easier to read; OIDs are what's actually sent over the wire.

Try it: sysDescr (1.3.6.1.2.1.1.1) →

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iso/org/dod/internet/private/enterprises/.25506/.2/.42/hh3cEponDeviceMIB/.1/.1/.3/hh3cEponDeviceEventsLogTable/hh3cEponDeviceEventsLogEntry/hh3cEponDeviceEventsLogType

hh3cEponDeviceEventsLogType

OBJECT-TYPE

1.3.6.1.4.1.25506.2.42.4.1.1.3.2.1.7

Access

read-only

Status

current

Source

HH3C-EPON-DEVICE-MIB

Sub-identifiers

Description

A list of types for Events. Events are ordered according to their significance where 1 is the highest severity. hh3cEponDeviceDyingGaspAlarmState(1) indicates a Dying Gasp Alarm State, hh3cEponDeviceCriticalEventState(2) indicates a Critical Event State, hh3cEponDeviceLocalLinkFaultAlarmState(3) indicates a Local Link Fault Alarm State, hh3cEponDeviceTemperatureEventIndicationState(4) indicates a Temperature Event Indication State, hh3cEponDevicePowerVoltageEventIndicationState(5) indicates a Power Voltage Event Indication State, hh3cEponDeviceGlobalEventState(6) indicates a Global Event State, hh3cEponDeviceErroredSymbolPeriodEventState(7) indicates an Errored Symbol Period Event State, hh3cEponDeviceErroredFrameEventState(8) indicates an Errored Frame Event State, hh3cEponDeviceErroredFramePeriodEventState(9) indicates an Errored Frame Period Event State, hh3cEponDeviceErroredFrameSecondsSummaryEventState(10) indicates an Errored Frame Seconds Summary Event State, hh3cEponDeviceOrganizationSpecificEventState(11) indicates an Organization Specific Event State.

Syntax

INTEGER { hh3cEponDeviceDyingGaspAlarmState (1), hh3cEponDeviceCriticalEventState (2), hh3cEponDeviceLocalLinkFaultAlarmState (3), hh3cEponDeviceTemperatureEventIndicationState (4), hh3cEponDevicePowerVoltageEventIndicationState (5), hh3cEponDeviceGlobalEventState (6), hh3cEponDeviceErroredSymbolPeriodEventState (7), hh3cEponDeviceErroredFrameEventState (8), hh3cEponDeviceErroredFramePeriodEventState (9), hh3cEponDeviceErroredFrameSecondsSummaryEventState (10), hh3cEponDeviceOrganizationSpecificEventState (11) }