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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/.25506/.2/hh3cBgpVpn/.1/.1/hh3cBgpPeerSessionTable/hh3cBgpPeerSessionEntry/hh3cBgpPeerSessionReason

hh3cBgpPeerSessionReason

OBJECT-TYPE

1.3.6.1.4.1.25506.2.202.1.1.6.1.10

Access

read-only

Status

current

Source

HH3C-BGP-VPN-MIB

Sub-identifiers

Description

The reason of BGP states change.

Syntax

INTEGER { otherErrCode(1), errSubCodeUnspecified(2), unknownErrSubcode(3), connectionNoSynchronized(4), badMessageLength(5), badMessageType(6), unsupportedVersionNumber(7), badPeerAS(8), badBGPIdentifier(9), unsupportedOptionalParameter(10), authenticationFailure(11), unacceptableHoldTime(12), unsupportedCapability(13), malformedAttributeList(14), unrecognizedWellknownAttr(15), missingWellknownAttribute(16), attributeFlagsError(17), attributeLengthError(18), invalidORIGINAttribute(19), asRoutingLoop(20), invalidNEXTHOPAttribute(21), optionalAttributeError(22), invalidNetworkField(23), malformedASPATH(24), receiveUnexpectedMessageinOpenSent(25), receiveUnexpectedMessageinOpenConfirm(26), receiveUnexpectedMessageinEstablished(27), maximumNumberofPrefixesReached(28), administrativeShutdown(29), peerDeconfigured(30), administrativeReset(31), connectionRejected(32), otherConfigurationChange(33), connectionCollisionResolution(34), outofResources(35) }