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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/.6/hwTest/hwNTest/.1/.1/hwISDNDiagnoseTestTable/hwISDNDiagnoseTestEntry/hwISDNDiagnoseTestResult

hwISDNDiagnoseTestResult

OBJECT-TYPE

1.3.6.1.4.1.2011.6.21.2.1.1.31.1.5

Access

read-only

Status

current

Source

HUAWEI-NTEST-MIB

Sub-identifiers

Description

Test Result. Options: 1. activeok(1) -indicates line active ok 2. selfcheckfault(2) -indicates board selfcheck fault 3. loopback1operfault(3) -indicates loopback1 operation fault 4. loopback1cancelfault(4) -indicates loopback1 cancel fault 5. loopback1crccheckfault(5) -indicates loopback1 crc check fault 6. activent1fault(6) -indicates active nt1 fault 7. nt1crccheckfault(7) -indicates nt1 crc check fault 8. ufaultloopback0succ(8) -indicates u fault loopback0 success 9. loopback2operfault(9) -indicates loopback2 operation fault 10. loopbackcancelfault(10) -indicates loopback2 cancel fault 11. loopback2crccheckfault(11) -indicates loopback2 crc check fault 12. noterminal(12) -indicates no terminal 13. timeout(13) -indicates time out 14. userstopsucc(14) -indicates user stop test success 15. exceptstop(15) -indicates except stop 16. nt1fault(16) -indicates nt1 fault 17. testcanceled(17) -indicates test is canceled;

Syntax

INTEGER { activeok(1), selfcheckfault(2), loopback1operfault(3), loopback1cancelfault(4), loopback1crccheckfault(5), activent1fault(6), nt1crccheckfault(7), ufaultloopback0succ(8), loopback2operfault(9), loopbackcancelfault(10), loopback2crccheckfault(11), noterminal(12), timeout(13), userstopsucc(14), exceptstop(15), nt1fault(16), testcanceled(17) }