DOT12-IF-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › DOT12-IF-MIB

Organization: IETF 100VG-AnyLAN MIB Working Group

Last Updated: 1996-02-22

Category: Network Interfaces

Description: Defines managed objects for IEEE 802.12 (100VG-AnyLAN) interfaces.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring DOT12-IF-MIB with a free 30-day trial of IPNetwork Monitor.

What Is DOT12-IF-MIB?

DOT12-IF-MIB is an IETF standards-track MIB (RFC 2020) developed by the 802.12-AnyLAN MIB Working Group that defines managed objects for IEEE 802.12 (100VG-AnyLAN) interfaces, a now-obsolete 100 Mbps LAN technology using demand-priority access. It exposes per-interface configuration in dot12ConfigTable (dot12CurrentFramingType/DesiredFramingType distinguishing 802.3 vs. 802.5 frame emulation, dot12DesiredPromiscStatus, dot12ControlMode for master/slave/learn mode, dot12Commands for open/close/reset actions, and dot12Status reflecting training state such as opened, opening, openFailure, linkFailure), plus per-interface traffic statistics in dot12StatTable (dot12InHighPriorityFrames/Octets, dot12InNormPriorityFrames/Octets, dot12InDataErrors, dot12TransitionIntoTrainings, and 64-bit counter variants). This is useful for confirming that a 100VG-AnyLAN interface has completed its demand-priority training sequence and for tracking priority-traffic volumes and training-related link flaps. It depends on IF-MIB for ifIndex as its table index and applies to any vendor's 802.12-compliant repeater/end-station hardware, a technology now essentially retired; readers can consult the DOT12-IF-MIB RFC for the full object definitions.

IPNetwork Monitor allows you to monitor SNMP objects defined in DOT12-IF-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • vendor-neutral, standards-based MIB (RFC 2020), not tied to a specific manufacturer — applies to IEEE 802.12 (100VG-AnyLAN) interfaces

Monitoring Examples

An operator polls dot12Status on a 100VG-AnyLAN port to confirm it reads opened rather than cycling between opening and linkFailure, and watches dot12TransitionIntoTrainings; a rising transitions counter combined with dot12Status stuck at openFailure would indicate a persistent cabling or configuration mismatch preventing successful demand-priority training.

What Can Be Monitored

  • interface framing type (current/desired) and capability
  • training/link status (opened, opening, failure states)
  • control mode (master/slave/learn)
  • high/normal priority frame and octet counters
  • training transition and data error counters
Imported Objects

From IF-MIB

ifIndexOBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
MODULE-IDENTITY
OBJECT-TYPE
transmission

How to Use in IPNetwork Monitor

Example using dot12InHighPriorityFrames OID:

Select an IEEE 802.12 100VG-AnyLAN network interface (vendor-neutral IETF standard RFC 2020) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type dot12InHighPriorityFrames into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. This object is a count of high priority frames that have been received on this interface. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

IEEE 802.12 (100VG-AnyLAN) network interface management including configuration and status monitoring.

Start monitoring IEEE 802.12 100VG-AnyLAN network interface (vendor-neutral IETF standard RFC 2020) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download DOT12-IF-MIB