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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/.4756/frm220/.361/f16E1RemoteTable/f16E1RemoteEntry/fa16e1et100TimingSourceRemote

fa16e1et100TimingSourceRemote

OBJECT-TYPE

1.3.6.1.4.1.4756.20.361.20.1.154

Access

read-write

Status

current

Source

CTC-FRM220-MIB

Sub-identifiers

Description

16E1-ET100(T/S) Series card clock: 0:Internal oscillatro 1:Recovery from E1 channel 1 2:Recovery from E1 channel 2 3:Recovery from E1 channel 3 4:Recovery from E1 channel 4 5:Recovery from E1 channel 5 6:Recovery from E1 channel 6 7:Recovery from E1 channel 7 8:Recovery from E1 channel 8 9:Recovery from E1 channel 9 10:Recovery from E1 channel 10 11:Recovery from E1 channel 11 12:Recovery from E1 channel 12 13:Recovery from E1 channel 13 14:Recovery from E1 channel 14 15:Recovery from E1 channel 15 16:Recovery from E1 channel 16

Syntax

INTEGER { internalOscillator(0), recoveryFromE1Channel1(1), recoveryFromE1Channel2(2), recoveryFromE1Channel3(3), recoveryFromE1Channel4(4), recoveryFromE1Channel5(5), recoveryFromE1Channel6(6), recoveryFromE1Channel7(7), recoveryFromE1Channel8(8), recoveryFromE1Channel9(9), recoveryFromE1Channel10(10), recoveryFromE1Channel11(11), recoveryFromE1Channel12(12), recoveryFromE1Channel13(13), recoveryFromE1Channel14(14), recoveryFromE1Channel15(15), recoveryFromE1Channel16(16) }