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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/.2011/hwProducts/atm/atmAccess/.1/.1/.15/.2/cbrDS1E1PortConfTable/cbrDS1E1PortConfEntry/cbrDS1E1PortConfFraming

cbrDS1E1PortConfFraming

OBJECT-TYPE

1.3.6.1.4.1.2011.2.1.1.1.1.15.2.1.1.4

Access

read-write

Status

mandatory

Source

C-PRODUCT-CBR-MIB

Sub-identifiers

Description

This object indicates the type of frame organization configured for the specified T1/E1 port interface. D4 and ESF frame organizations apply to T1 interfaces ONLY. Single-frame and multi-frame organizations pertain to E1 interfaces ONLY. An error is returned if a set is applied to an inappropriate cardtype (eg. T1-D4 is applied to an E1 cardtype). Unframed is not a valid configuration in a structured mode. The E1 interface will not allow framing to be changed in structured voice mode. Changing the framing configuration for an E1 interface will cause the following parameters to be changed in unstructured and structured data modes. . signaling crc-4 . . E1 unframed disable disable . single-frame disable* disable . multi-frame enable* enable * signaling is automatically changed in unstructured mode only The default value is unframed (1).

Syntax

INTEGER { unframed(1), t1-D4(2), t1-ESF(3), e1-single-frame(4), e1-multi-frame(5) }