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What's a MIB?

A MIB (Management Information Base) defines the data a device can report over SNMP — things like interface counters, system uptime, or CPU load — organizing each value under a name and a fixed numeric address. Every MIB module declares a tree of related objects, and a device typically implements dozens of MIBs at once: a handful of universal ones every vendor supports, plus whatever proprietary ones that specific vendor has published.

What's SNMP?

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.

Try it: sysDescr (1.3.6.1.2.1.1.1) → Read more →

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SNMP Fundamentals

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Using net-snmp

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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.

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DOCSIS Monitoring

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.

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

ChrComIfifTable-MIB

9 objects

No module-level DESCRIPTION found.

Imported Objects

Chromatis-MIB	chrComIf
ChrTyp-MIB MISSING	AdminStatus OperStatus
RFC1213-MIB	DisplayString
SNMPv2-SMI	Counter32 Integer32 OBJECT-TYPE Unsigned32

OID	Name	Access	Status	Description
1.3.6.1.4.1.3695.1.2.10	TablechrComIfifTableTable	not-accessible	current	Chromatis Interface Table
1.3.6.1.4.1.3695.1.2.10.1	RowchrComIfifTableEntry	not-accessible	current
1.3.6.1.4.1.3695.1.2.10.1.1	ColumnchrComIfifIndex	read-only	current
1.3.6.1.4.1.3695.1.2.10.1.2	ColumnchrComIfifName	read-write	current	String of text defining the name of the port given by the user.
1.3.6.1.4.1.3695.1.2.10.1.3	ColumnchrComIfifAdminStatus	read-write	current	The desired state of the interface. The testing(3) state indicates that no operational packets can be passed. When a managed system initializes, all interfaces…
1.3.6.1.4.1.3695.1.2.10.1.4	ColumnchrComIfifOperStatus	read-only	current	The down state of ifOperStatus has two meanings, depending on the value of ifAdminStatus. (1) if ifAdminStatus is not down and ifOperStatus is down then a faul…
1.3.6.1.4.1.3695.1.2.10.1.5	ColumnchrComIfvirtualIfIndex	read-only	current	This attribute is an outcome of the card/Path Protection attribute of the equipment table. The peer ID is a virtual card ID (which is the higher of the two pee…
1.3.6.1.4.1.3695.1.2.10.1.6	ColumnchrComIfreal1IfIndex	read-only	current	This field represents the first real IfIndex , if IfIndex is virtual.
1.3.6.1.4.1.3695.1.2.10.1.7	ColumnchrComIfreal2IfIndex	read-only	current	This field represents the second real IfIndex , if IfIndex is virtual.

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