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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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iso/org/dod/internet/private/enterprises/.2636/.3/.49/jnxL2tp/.1/jnxL2tpTunnelStatsTable/jnxL2tpTunnelStatsEntry/jnxL2tpTunnelStatsState

jnxL2tpTunnelStatsState

OBJECT-TYPE

1.3.6.1.4.1.2636.3.49.1.1.3.1.9

Access

read-only

Status

current

Source

JNX-L2TP-MIB

Sub-identifiers

Description

This field contains the current state of the control tunnel - one of the internal tunnel state names as described below: cc_responder_accept_new The tunnel has received and accepted the start control connection request (SCCRQ) cc_responder_reject_new The tunnel has received and rejected the SCCRQ cc_responder_idle The tunnel has just been created cc_responder_wait_ctl_conn The tunnel has sent the start control connection response (SCCRP) and is waiting for the start control connection connected (SCCCN) message cleanup The tunnel is being cleaned up closed The tunnel is being closed destroyed The tunnel is being destroyed established The tunnel is operating terminate The tunnel is terminating Unknown The tunnel is not connected to the router.

Syntax

INTEGER { cc-responder-accept-new(1), cc-responder-reject-new(2), cc-responder-idle(3), cc-responder-wait-ctl-conn(4), cleanup(5), closed(6), destroyed(7), established(8), terminate(9), unknown(10) }