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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.

What's SNMP?

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/.1966/.21/.1/mcrMGTMIB/.1/.1/.4/.5/mcrMgtEthStatsTable/mcrMgtEthStatsEntry

mcrMgtEthStatsEntry

OBJECT-TYPE

1.3.6.1.4.1.1966.21.1.1.1.1.4.5.4.1

Access

not-accessible

Status

current

Source

PERLE-MCR-MGT-MIB

Sub-identifiers

Description

An entry in the Ethernet statistics table, each relating to an Ethernet interface.

Syntax

McrMgtEthStatsEntry

Children (39)

.2mgtEthSlotIndex .3mgtEthStatsIfIndex .4mgtEthStatsName .5mgtEthStatsMacAddress .6mgtEthStatsStatus .7mgtEthStatsSpeedDuplex .8mgtEthStatsBroadcast .9mgtEthStatsDebug .10mgtEthStatsLoopback .11mgtEthStatsPointtoPoint .12mgtEthStatsNoTrailers .13mgtEthStatsRunning .14mgtEthStatsNoArp .15mgtEthStatsPromiscuous .16mgtEthStatsRxMulticast .17mgtEthStatsMasterLoadBalancer .18mgtEthStatsSlaveLoadBalancer .19mgtEthStatsMulticast .20mgtEthStatsSetMedia .21mgtEthStatsAutoMedia .22mgtEthStatsDynamic .23mgtEthStatsLocalAddress .24mgtEthStatsSubnetMask .25mgtEthStatsBroadcastAddress .26mgtEthStatsMtu .27mgtEthStatsTxQLen .28mgtEthStatsRxBytes .29mgtEthStatsTxBytes .30mgtEthStatsRxPackets .31mgtEthStatsTxPackets .32mgtEthStatsRxErrors .33mgtEthStatsTxPktErrors .34mgtEthStatsRxDroppedPkts .35mgtEthStatsTxDroppedPkts .36mgtEthStatsRxOverruns .37mgtEthStatsTxOverruns .38mgtEthStatsRxFrameErrs .39mgtEthStatsTxCarrierErrs .40mgtEthStatsCollisions