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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

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

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.

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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Modem/MTA bootfiles

Compiling modem and MTA configuration files from plain text, and reading real Arris and Hitron examples OID by OID.

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.

Get started

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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.

iso/org/dod/internet/private/enterprises/.3902/.15/.2/.11/.17/extendedAclTable/extendedAclEntry/ruleExtendedProtocol

ruleExtendedProtocol

OBJECT-TYPE

1.3.6.1.4.1.3902.15.2.11.17.3.1.4

Access

read-write

Status

current

Source

Es2952-MIB

Sub-identifiers

Description

Extended acl config for other protocol. The format is P:RULE. P means protocol value, P is IC,known as icmp(1) protocol, the format of RULE is X-A.B.C.D/N-A.B.C.D/N-IC-C-D-F; P is I,known as ip protocol, the format of RULE is X-A.B.C.D/N-A.B.C.D/N-D-F; P is T,known as tcp(6) protocol, the format of RULE is X-A.B.C.D/N-S-A.B.C.D/N-DE-E-D-F; P is U,known as udp(17) protocol, the format of RULE is X-A.B.C.D/N-S-A.B.C.D/N-DE-D-F; P is A,known as arp protocol, the format of RULE is X-A.B.C.D/N-A.B.C.D/N; P is 0-255(except 1,6 and 17),known as protocol id 0-255(except 1,6 and 17), the format of RULE is X-A.B.C.D/N-A.B.C.D/N-D-F; If P is 1(ICMP),the format of RULE is X-A.B.C.D/N-A.B.C.D/N-IC-C-D-F; If P is 6(TCP),the format of RULE is X-A.B.C.D/N-S-A.B.C.D/N-DE-E-D-F; If P is 17(UDP),the format of RULE is X-A.B.C.D/N-S-A.B.C.D/N-DE-D-F; Here X is 1:deny;2:permit; the first A.B.C.D/N is source ip and mask.if 'x' means any; the second A.B.C.D/N is destination ip and mask.if 'x' means any; IC takes the value of 0-255; 0 means no icmp message type set; 1-255 means icmp message type (0-254) set ; C takes the value of 0-255; 0 means no icmp code type set; 1-255 means icmp code type (0-254) set ; E: 0 means tcp connectiong mode set; 1 means establishing set;2 means established set; S takes the format of P*Q,P: 0: no source port set,Q is also 0; 1-65536: source port 0-65535 ,same scope for Q. DE takes the format of P*Q,P: 0: no destination port set,Q is also 0; 1-65536: destination port 0-65535 ,same scope for Q. D takes the value of 0-64; 0 means no dscp value set; 1-64 means dscp value (0-63) set ; F : 0 means no fragment set;1 means fragment set.

Syntax

OCTET STRING

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