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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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HH3C-IPMCAST-MIB

10 objects

IP Multicast Management MIB

Imported Objects

HH3C-OID-MIB	hh3cCommon
INET-ADDRESS-MIB	InetAddressType
SNMPv2-SMI	MODULE-IDENTITY NOTIFICATION-TYPE OBJECT-TYPE Unsigned32

OID	Name	Access	Status	Description
1.3.6.1.4.1.25506.2.212	Identityhh3cIpMcast			IP Multicast Management MIB
1.3.6.1.4.1.25506.2.212.0	Nodehh3cIpMcastNotifications
1.3.6.1.4.1.25506.2.212.0.1	Notificationhh3cIpMcastEntryExceed		current	The hh3cMcastEntryExceed is generated when the IP multicast entries exceeded global entry limit of IP multicast routing-table.
1.3.6.1.4.1.25506.2.212.0.2	Notificationhh3cIpMcastEntryExceedClear		current	The hh3cMcastEntryExceedClear is generated when the IP multicast entries fell below global entry limit of IP multicast routing-table.
1.3.6.1.4.1.25506.2.212.1	Nodehh3cIpMcastObjects
1.3.6.1.4.1.25506.2.212.2	Nodehh3cIpMcastTrapBindObjects
1.3.6.1.4.1.25506.2.212.2.1	Scalarhh3cIpMcastEntryLimitType	accessible-for-notify	current	This variable defines IP multicast entry limit type. The star-group is (*, G) entry. The source-group is (S, G) entry.
1.3.6.1.4.1.25506.2.212.2.2	Scalarhh3cIpMcastAddressFamily	accessible-for-notify	current	It is address family of IP multicast.
1.3.6.1.4.1.25506.2.212.2.3	Scalarhh3cIpMcastEntryLimitCount	accessible-for-notify	current	It is the IP multicast entry limit value.
1.3.6.1.4.1.25506.2.212.2.4	Scalarhh3cIpMcastEntryLimitReasonType	accessible-for-notify	current	Describe the reason for trap sending: The 'entryDeleted' status indicates that the reason is table entry deletion. The 'configurationChanged' status indicates …