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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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ARISTA-BRIDGE-EXT-MIB

11 objects

This MIB contains extensions to the BRIDGE-MIB.

Imported Objects

ARISTA-SMI-MIB	aristaMibs
Q-BRIDGE-MIB	dot1qFdbId dot1qTpFdbAddress
RMON2-MIB	TimeFilter
SNMPv2-CONF	MODULE-COMPLIANCE OBJECT-GROUP
SNMPv2-SMI	Counter32 MODULE-IDENTITY OBJECT-TYPE TimeTicks

OID	Name	Access	Status	Description
1.3.6.1.4.1.30065.3.2	IdentityaristaBridgeExtMIB			This MIB contains extensions to the BRIDGE-MIB.
1.3.6.1.4.1.30065.3.2.1	TablearistaDot1qTpFdbTable	not-accessible	current	A table that contains host move information about unicast entries for which the device has forwarding information.
1.3.6.1.4.1.30065.3.2.1.1	RowaristaDot1qTpFdbEntry	not-accessible	current	Information about a specific unicast MAC address for which the device has some forwarding information.
1.3.6.1.4.1.30065.3.2.1.1.1	ColumnaristaDot1qTpFdbTimeMark	not-accessible	current	A TimeFilter that can be used to filter out entries that have not moved recently. If you don't want to filter, make sure to pass '0' for the value of this inde…
1.3.6.1.4.1.30065.3.2.1.1.2	ColumnaristaDot1qTpFdbNumMoves	read-only	current	The number of times a given MAC address has changed ports without having been aged out, or the value 1 for a MAC address that was not previously in the table b…
1.3.6.1.4.1.30065.3.2.1.1.3	ColumnaristaDot1qTpFdbLastMove	read-only	current	The value of sysUpTime the last time the value of aristaDot1qTpFdbNumMoves was incremented.
1.3.6.1.4.1.30065.3.2.2	NodearistaBridgeExtConformance
1.3.6.1.4.1.30065.3.2.2.1	NodearistaBridgeExtGroups
1.3.6.1.4.1.30065.3.2.2.1.1	GrouparistaBridgeExtBaseGroup		current	A collection of objects providing MAC move count and times.
1.3.6.1.4.1.30065.3.2.2.2	NodearistaBridgeExtCompliances
1.3.6.1.4.1.30065.3.2.2.2.1	CompliancearistaBridgeExtCompliance		current	The compliance statement for device support of MAC move count and times.