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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/.7483/.6/.1/.2/.24/.2/tnSapIgmpSnpgConfigTable/tnSapIgmpSnpgConfigEntry/tnSapIgmpSnpgCfgMcacPrRsvMndBW

tnSapIgmpSnpgCfgMcacPrRsvMndBW

OBJECT-TYPE

1.3.6.1.4.1.7483.6.1.2.24.2.1.1.17

Access

read-write

Status

current

Source

TN-IGMP-SNOOPING-MIB

Sub-identifiers

Description

The value of tnSapIgmpSnpgCfgMcacPrRsvMndBW specifies the bandwidth pre-reserved for all the mandatory channels on a given interface in kilo-bits per second(kbps). If the value of tnSapIgmpSnpgCfgMcacUnconstBW is '0', no mandatory channels are allowed. If the value of tnSapIgmpSnpgCfgMcacPrRsvMndBW is '-1', then all mandatory and optional channels are allowed. If the value of tnSapIgmpSnpgCfgMcacPrRsvMndBW is equal to the value of tnSapIgmpSnpgCfgMcacUnconstBW, then all the unconstrained bandwidth on a given interface is allocated to mandatory channels configured through multicast CAC policy on that interface and no optional groups (channels) are allowed. The value of tnSapIgmpSnpgCfgMcacPrRsvMndBW should always be less than or equal to that of tnSapIgmpSnpgCfgMcacUnconstBW. An attempt to set the value of tnSapIgmpSnpgCfgMcacPrRsvMndBW greater than that of tnSapIgmpSnpgCfgMcacUnconstBW will result in inconsistent value error.

Syntax

Integer32 (-1|0..2147483647)