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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.

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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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ZYXEL-DIFFSERV-MIB

10 objects

The subtree for Differentiated services (Diffserv)

Imported Objects

BRIDGE-MIB	dot1dBasePort
P-BRIDGE-MIB	EnabledStatus
SNMPv2-SMI	-- RFC2578 MODULE-IDENTITY OBJECT-TYPE
ZYXEL-ES-SMI	esMgmt

OID	Name	Access	Status	Description
1.3.6.1.4.1.890.1.15.3.22	IdentityzyxelDiffserv			The subtree for Differentiated services (Diffserv)
1.3.6.1.4.1.890.1.15.3.22.1	NodezyxelDiffservSetup
1.3.6.1.4.1.890.1.15.3.22.1.1	ScalarzyDiffservState	read-write	current	Enable/Disable DiffServ on the switch. DiffServ is a class of service (CoS) model that marks packets so that they receive specific per-hop treatment at DiffSer…
1.3.6.1.4.1.890.1.15.3.22.1.2	TablezyxelDiffservMapTable	not-accessible	current	The table contains Diffserv map configuration.
1.3.6.1.4.1.890.1.15.3.22.1.2.1	RowzyxelDiffservMapEntry	not-accessible	current	An entry contains Diffserv map configuration.
1.3.6.1.4.1.890.1.15.3.22.1.2.1.1	ColumnzyDiffservMapDscp	not-accessible	current	The DSCP classification identification number.
1.3.6.1.4.1.890.1.15.3.22.1.2.1.2	ColumnzyDiffservMapPriority	read-write	current	Set the IEEE 802.1p priority mapping.
1.3.6.1.4.1.890.1.15.3.22.1.3	TablezyxelDiffservPortTable	not-accessible	current	The table contains Diffserv port configuration.
1.3.6.1.4.1.890.1.15.3.22.1.3.1	RowzyxelDiffservPortEntry	not-accessible	current	An entry contains Diffserv port configuration.
1.3.6.1.4.1.890.1.15.3.22.1.3.1.1	ColumnzyDiffservPortState	read-write	current	Enable/Disable DiffServ on the port.