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What's a MIB?

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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SNMP (Simple Network Management Protocol) is how network devices — routers, switches, servers — report status and statistics to monitoring tools. It's the protocol; MIBs are the vocabulary it uses to describe what's being asked for.

What's an OID?

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/hh3cEntityExtend/.1/.1/hh3cEntityExtStateTable/hh3cEntityExtStateEntry

hh3cEntityExtStateEntry

OBJECT-TYPE

1.3.6.1.4.1.25506.2.6.1.1.1.1

Access

not-accessible

Status

current

Source

HH3C-ENTITY-EXT-MIB

Sub-identifiers

Description

The information about a particular physical entity.

Syntax

Hh3cEntityExtStateEntry

Children (34)

.1hh3cEntityExtPhysicalIndex .2hh3cEntityExtAdminStatus .3hh3cEntityExtOperStatus .4hh3cEntityExtStandbyStatus .5hh3cEntityExtAlarmLight .6hh3cEntityExtCpuUsage .7hh3cEntityExtCpuUsageThreshold .8hh3cEntityExtMemUsage .9hh3cEntityExtMemUsageThreshold .10hh3cEntityExtMemSize .11hh3cEntityExtUpTime .12hh3cEntityExtTemperature .13hh3cEntityExtTemperatureThreshold .14hh3cEntityExtVoltage .15hh3cEntityExtVoltageLowThreshold .16hh3cEntityExtVoltageHighThreshold .17hh3cEntityExtCriticalTemperatureThreshold .18hh3cEntityExtMacAddress .19hh3cEntityExtErrorStatus .20hh3cEntityExtCpuMaxUsage .21hh3cEntityExtLowerTemperatureThreshold .22hh3cEntityExtShutdownTemperatureThreshold .23hh3cEntityExtPhyMemSize .24hh3cEntityExtPhyCpuFrequency .25hh3cEntityExtFirstUsedDate .26hh3cEntityExtCpuAvgUsage .27hh3cEntityExtMemAvgUsage .28hh3cEntityExtMemType .29hh3cEntityExtCriticalLowerTemperatureThreshold .30hh3cEntityExtShutdownLowerTemperatureThreshold .31hh3cEntityExtCpuUsageRecoverThreshold .32hh3cEntityExtMemSizeRev .33hh3cEntityExtCpuUsageIn1Minute .34hh3cEntityExtCpuUsageIn5Minutes