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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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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.

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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/.259/.10/.1/ecs4510MIB/.1/.2/portTable/portEntry/portSpeedDpxCfg

portSpeedDpxCfg

OBJECT-TYPE

1.3.6.1.4.1.259.10.1.24.1.2.1.1.4

Access

read-write

Status

current

Source

ECS4510-MIB

Sub-identifiers

Description

Configures the speed and duplex mode for a port or trunk, according to: halfDuplex10(2) - 10Mbps and half duplex mode fullDuplex10(3) - 10Mbps and full duplex mode halfDuplex100(4) - 100Mbps and half duplex mode fullDuplex100(5) - 100Mbps and full duplex mode halfDuplex1000(6) - 1000Mbps and half duplex mode fullDuplex1000(7) - 1000Mbps and full duplex mode halfDuplex10g(8) - 10g and half duplex mode fullDuplex10g(9) - 10g and full duplex mode hundredBaseTX port can be set as: halfDuplex10(2) fullDuplex10(3) halfDuplex100(4) fullDuplex100(5) hundredBaseFX port can be set as: fullDuplex100(5) thousandBaseSX port can be set as: fullDuplex1000(7) thousandBaseLX port can be set as: fullDuplex1000(7) thousandBaseT port can be set as: halfDuplex10(2) fullDuplex10(3) halfDuplex100(4) fullDuplex100(5) thousandBaseGBIC port can be set as: fullDuplex1000(7) thousandBaseSfp port can be set as: fullDuplex1000(7) hundredBaseFxScSingleMode port can be set as: fullDuplex100(5) hundredBaseFxScMultiMode port can be set as: fullDuplex100(5) thousandBaseCX port can be set as: fullDuplex1000(7) tenG port can be set as: halfDuplex10g(8) fullDuplex10g(9) The actual operating speed and duplex of the port is given by portSpeedDpxStatus.

Syntax

INTEGER { reserved(1), halfDuplex10(2), fullDuplex10(3), halfDuplex100(4), fullDuplex100(5), halfDuplex1000(6), fullDuplex1000(7), halfDuplex10g(8), fullDuplex10g(9) }