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SNMP & MIB Basics

What's a MIB?

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SNMP (Simple Network Management Protocol) is how routers, switches, servers, and other network devices report status and statistics back to monitoring tools. It's the transport; MIBs are the vocabulary that gives the data it carries any meaning. Most monitoring platforms — Zabbix, PRTG, LibreNMS, Prometheus's SNMP exporter, and plenty of others — rely on this same underlying protocol and MIB structure.

What's an OID?

An OID is the actual address of one piece of data — a dotted sequence like 1.3.6.1.2.1.1.1, read from the root of a shared global tree down to one specific object. Names are for humans; OIDs are what actually gets sent over the wire. Every vendor's private MIBs live under that vendor's own reserved branch of the same tree, which is what lets one numbering system cover both universal and proprietary data.

What is a MIB browser?

A MIB browser is a tool for reading and navigating MIB files — the definitions that describe what data a device can report over SNMP. Instead of reading raw ASN.1 text by hand, a MIB browser renders each object's name, OID, syntax, and description in a searchable, navigable form. MIB Viewer does this entirely in your browser, for MIBs already in its database or ones you upload yourself.

What is an OID lookup tool?

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Can I look up a MIB from a specific vendor?

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Guides & Resources

Beyond the lookup tool, the site includes practical, hands-on guides and reference material — installing and using the standard SNMP tools, configuring SNMP on specific vendor hardware, monitoring DOCSIS cable modems and CMTSs, and working through the errors people run into most. A few places to start:

SNMP Fundamentals

The manager/agent model, MIBs and OIDs, versions, access control, and all six core operations in one place.

Using net-snmp

Installing the standard Linux SNMP toolkit, the client commands, running an agent, receiving traps, and loading MIBs into each one.

Configuring SNMP on Cisco devices

Community strings, SNMPv3 users, and trap destinations across classic IOS, IOS-XE, and NX-OS — including where NX-OS's syntax genuinely diverges.

Configuring SNMP on Fortinet devices

FortiOS's config system snmp syntax for communities, SNMPv3 users, and choosing which events actually generate a trap.

Understanding MIBs

How objects, tables, and notifications are actually defined, and how vendor-specific numbering keeps everyone's private OIDs from colliding.

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Signal quality and status OIDs for both the modem and CMTS side, what changed across DOCSIS versions, and how DOCS-IF3/IF31-MIB extend it for bonded and OFDM channels.

Linux snmpd passthrough

NET-SNMP-EXTEND-MIB and the extend directive in snmpd.conf, used to expose the output of shell scripts as custom OIDs.

Get started

Search for a MIB or OID above, or pick one from the list on the left.

Have your own MIB file? Drop it on the upload zone in the sidebar (or click to browse) to parse and explore it right away. It's sent to the server to be parsed and isn't added to the shared, publicly searchable database — it stays scoped to your own session in the tree on the left.

New here? The Guides menu above is the place to start if you want the concepts explained rather than just looked up.

INFINERA-PM-SDHCLIENTCTP-MIB

50 objects

No module-level DESCRIPTION found.

Imported Objects

HC-PerfHist-TC-MIB	HCPerfIntervalCount
IF-MIB	ifIndex
INFINERA-REG-MIB	commonPerfMon
INFINERA-TC-MIB	FloatArbitraryPrecision FloatHundredths InfnServiceType
SNMPv2-CONF	MODULE-COMPLIANCE OBJECT-GROUP
SNMPv2-SMI	Counter64 Integer32 MODULE-IDENTITY OBJECT-TYPE
SNMPv2-TC	DisplayString TruthValue

OID	Name	Access	Status	Description
1.3.6.1.4.1.21296.2.2.1.11.1	IdentitysdhClientCtpPmMIB
1.3.6.1.4.1.21296.2.2.1.11.1.1	TablesdhClientCtpPmRealTable	not-accessible	current	A list of SdhClientCtpPmReal entries. Each entry is uniquely identified by the value of ifIndex.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1	RowsdhClientCtpPmRealEntry	not-accessible	current	A SdhClientCtp entry containing real-time performance information pertaining to Infinera SdhClientCtp interfaces. Entries will exist in this table for interfac…
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.1	ColumnsdhClientCtpPmRealRxBE	read-only	current	Count of the number of errors within a block in the incoming client�s SDH signal. All Infinera SDH interfaces use 8000 blocks/sec, regardless of signal rate.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.2	ColumnsdhClientCtpPmRealRxES	read-only	current	Count of the number of seconds during which (at any point during the second) at least one RS block error was detected or an LOS or LOF defect is present.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.3	ColumnsdhClientCtpPmRealRxSES	read-only	current	Count of the seconds during which 30% or more RS block errors (BE) were detected or an LOF or LOS defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.4	ColumnsdhClientCtpPmRealRxOFS	read-only	current	Regenerator Section - Out of Frame Seconds. Count of seconds during which an OOF defect is present (at any point in the second).
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.5	ColumnsdhClientCtpPmRealRxLOSS	read-only	current	Regenerator Section - Loss of Signal Seconds. Count of seconds during which any LOS defect (OLOS or dLOS) existed.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.6	ColumnsdhClientCtpPmRealTxBE	read-only	current	Count of the number of errors within a block in the SDH signal received from the network and to be transmitted to the receiving client. NOTE: All Infinera SDH …
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.7	ColumnsdhClientCtpPmRealTxES	read-only	current	Count of the number of seconds during which (at any point during the second) at least one Tx RS block error was detected or a de-encap (Tx) LOS or LOF defect w…
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.8	ColumnsdhClientCtpPmRealTxSES	read-only	current	Count of the seconds during which 30% or more Tx RS block errors (BE) were detected or a de-encap (Tx) LOF or LOS defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.9	ColumnsdhClientCtpPmRealTxOFS	read-only	current	Regenerator Section - Out of Frame Seconds. Count of seconds during which a de-encap (Tx) OOF defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.10	ColumnsdhClientCtpPmRealCktId	read-only	current	Circuit ID(s) of the connection created on the SDH termination point.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.11	ColumnsdhClientCtpPmRealLinePRBSSyncErr	read-only	current	Count of the number of times re-sync has been attempted after initial sync was achieved. Incremented only when Line PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.12	ColumnsdhClientCtpPmRealLinePRBSErr	read-only	current	Count of the number of bits not matching the expected pattern (whether synch has been achieved or not). Incremented only when Line PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.13	ColumnsdhClientCtpPmRealTribPRBSSyncErr	read-only	current	Count of the number of times re-sync has been attempted after initial sync was achieved. Incremented only when Trib PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.14	ColumnsdhClientCtpPmRealTribPRBSErr	read-only	current	Count of the number of bits not matching the expected pattern (whether synch has been achieved or not). Incre mented only when Trib PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.15	ColumnsdhClientCtpPmRealRxUAS	read-only	current	Regenerator Section - Unavailable seconds.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.16	ColumnsdhClientCtpPmRealTxUAS	read-only	current	Count of Un available seconds.
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.17	ColumnsdhClientCtpPmRealRxBER	read-only	current	Receive Bit Error Rate..
1.3.6.1.4.1.21296.2.2.1.11.1.1.1.18	ColumnsdhClientCtpPmRealTxBER	read-only	current	Transmit Bit Error Rate.
1.3.6.1.4.1.21296.2.2.1.11.1.2	TablesdhClientCtpPmTable	not-accessible	current	A list of SdhClientCtpPm entries. Each entry is uniquely identified by the value of ifIndex, sampleDuration and sdhClientCtpPmTimestamp.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1	RowsdhClientCtpPmEntry	not-accessible	current	A SdhClientCtp entry containing historical performance information pertaining to Infinera SdhClientCtp interfaces. Entries will exist in this table for interfa…
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.1	ColumnsdhClientCtpPmTimestamp	not-accessible	current	End Time stamp for this interval. If this time is later than the current time, then the data for this bucket is currently being collected.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.2	ColumnsdhClientCtpPmSampleDuration	not-accessible	current	The duration of this sample.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.3	ColumnsdhClientCtpPmValidity	read-only	current	Flag indicating if data was valid for the entire interval
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.4	ColumnsdhClientCtpPmRxBE	read-only	current	Count of the number of errors within a block in the incoming client�s SDH signal. All Infinera SDH interfaces use 8000 blocks/sec, regardless of signal rate.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.5	ColumnsdhClientCtpPmRxES	read-only	current	Count of the number of seconds during which (at any point during the second) at least one RS block error was detected or an LOS or LOF defect is present.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.6	ColumnsdhClientCtpPmRxSES	read-only	current	Count of the seconds during which 30% or more RS block errors (BE) were detected or an LOF or LOS defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.7	ColumnsdhClientCtpPmRxOFS	read-only	current	Regenerator Section - Out of Frame Seconds. Count of seconds during which an OOF defect is present (at any point in the second).
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.8	ColumnsdhClientCtpPmRxLOSS	read-only	current	Regenerator Section - Loss of Signal Seconds. Count of seconds during which any LOS defect (OLOS or dLOS) existed.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.9	ColumnsdhClientCtpPmTxBE	read-only	current	Count of the number of errors within a block in the SDH signal received from the network and to be transmitted to the receiving client. All Infinera SDH interf…
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.10	ColumnsdhClientCtpPmTxES	read-only	current	Count of the number of seconds during which (at any point during the second) at least one Tx RS block error was detected or a de-encap (Tx) LOS or LOF defect w…
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.11	ColumnsdhClientCtpPmTxSES	read-only	current	Count of the seconds during which 30% or more Tx RS block errors (BE) were detected or a de-encap (Tx) LOF or LOS defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.12	ColumnsdhClientCtpPmTxOFS	read-only	current	Regenerator Section - Out of Frame Seconds. Count of seconds during which a de-encap (Tx) OOF defect was present.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.13	ColumnsdhClientCtpPmCktId	read-only	current	Circuit ID(s) of the connection created on the SDH termination point.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.14	ColumnsdhClientCtpPmTribPRBSSyncErr	read-only	current	Count of the number of times re-sync has been attempted after initial sync was achieved. Incremented only when Trib PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.15	ColumnsdhClientCtpPmTribPRBSErr	read-only	current	Count of the number of bits not matching the expected pattern (whether synch has been achieved or not). Incre mented only when Trib PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.16	ColumnsdhClientCtpPmPayloadType	read-only	current	The payload type.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.17	ColumnsdhClientCtpPmRxUAS	read-only	current	Count of the Unavailable seconds.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.18	ColumnsdhClientCtpPmTxUAS	read-only	current	Count of the Unavailable seconds.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.19	ColumnsdhClientCtpPmLinePRBSSyncErr	read-only	current	Count of the number of times re-sync has been attempted after initial sync was achieved. Incremented only when Line PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.2.1.20	ColumnsdhClientCtpPmLinePRBSErr	read-only	current	Count of the number of bits not matching the expected pattern (whether synch has been achieved or not). Incre mented only when Line PRBS monitoring is enabled.
1.3.6.1.4.1.21296.2.2.1.11.1.3	NodesdhClientCtpPmConformance
1.3.6.1.4.1.21296.2.2.1.11.1.3.1	NodesdhClientCtpPmCompliances
1.3.6.1.4.1.21296.2.2.1.11.1.3.1.1	CompliancesdhClientCtpPmCompliance		current	Describes the requirements for conformance to the PM-SDHCLIENTCTP-MIB
1.3.6.1.4.1.21296.2.2.1.11.1.3.1.2	CompliancesdhClientCtpPmRealCompliance		current	Describes the requirements for conformance to the sdhClientCtpPmReal-MIB
1.3.6.1.4.1.21296.2.2.1.11.1.3.2	NodesdhClientCtpPmGroups
1.3.6.1.4.1.21296.2.2.1.11.1.3.2.1	GroupsdhClientCtpPmGroup		current	A collection of objects for reading the performance of the sdhClientCtp.
1.3.6.1.4.1.21296.2.2.1.11.1.3.2.2	GroupsdhClientCtpPmRealGroup		current	A collection of objects for reading the real-time performance of the sdhClientCtp.