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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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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/.6527/.3/.1/.2/.36/tmnxOspfSrPfxTable/tmnxOspfSrPfxEntry/tmnxOspfSrPfxSidFlags

tmnxOspfSrPfxSidFlags

OBJECT-TYPE

1.3.6.1.4.1.6527.3.1.2.36.40.1.8

Access

read-only

Status

current

Source

TIMETRA-OSPF-NG-MIB

Sub-identifiers

Description

The value of the object tmnxOspfSrPfxSidFlags indicates the flags of a Prefix-SID advertised extended prefix TLV. bitN (0) - Node-SID flag. The N-Flag is set on Prefix-SIDs attached to a router loopback address. bitP (1) - no-PHP flag. If set, then the penultimate hop MUST NOT pop the Prefix-SID before delivering the packet to the node that advertised the Prefix-SID. bitM (2) - Mapping Server flag. If set, the SID is advertised from the Segment Routing Mapping Server functionality bitE (3) - Explicit-Null Flag. If set, any upstream neighbor of the Prefix-SID originator MUST replace the Prefix-SID with a Prefix-SID having an Explicit-NULL value (0 for IPv4) before forwarding the packet. bitV (4) - Value flag. If set, then the Prefix-SID carries a value (instead of an index). bitL (5) - Local Flag. If set, then the value/index carried by the Prefix-SID has local significance. bitIA (6) - Inter Area flag. bitAT (7) - Attached flag. bitB (8) - Backup SID (Seamless MPLS)

Syntax

BITS { bitN (0), bitP (1), bitM (2), bitE (3), bitV (4), bitL (5), bitIA (6), bitAT (7), bitB (8) }