IEEE8021-ST-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsIEEE8021-ST-MIB

Organization: IEEE 802.1 Working Group

Last Updated: 2018-06-21

Category: Quality of Service, Standard: IEEE 802, Technology: Time Synchronization

Description: IEEE 802.1 MIB for Scheduled Traffic (802.1Qbv) managing time-aware traffic scheduling for time-sensitive networking (TSN).

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What Is IEEE8021-ST-MIB?

IEEE8021-ST-MIB is a vendor-neutral IEEE 802.1 standards MIB for the Scheduled Traffic feature (IEEE 802.1Qbv), a core Time-Sensitive Networking (TSN) mechanism that opens and closes per-traffic-class transmission gates on a strict schedule to guarantee deterministic latency. It exposes gate configuration and state data, including administrative and operational gate states, gate control list lengths, per-traffic-class maximum SDU (frame size) limits, and transmission overrun events. As a monitoring tool it is primarily used to verify software/protocol state health by confirming gates are operating as scheduled (matching administrative intent) and watching for transmissionOverrun notifications, which flag frames that missed their scheduled transmission window, a direct fault indicator in TSN networks. It builds on the base IEEE 802.1Q Bridge MIB and is closely related to other TSN MIBs such as the TSN remote management MIB. It is typically deployed in industrial automation, automotive, and professional audio/video networks requiring deterministic, low-jitter Ethernet delivery, where engineers often consult the IEEE8021-ST-MIB RFC and underlying 802.1Qbv specification for the full gate-scheduling object definitions.

IPNetwork Monitor allows you to monitor SNMP objects defined in IEEE8021-ST-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

  • Time-Sensitive Networking (TSN) switches
  • industrial Ethernet bridges
  • vendor-neutral, standards-based MIB, not tied to a specific manufacturer

Monitoring Examples

An engineer checks ieee8021STParametersTable/ieee8021STParametersEntry to compare ieee8021STAdminGateStates against ieee8021STOperGateStates on a port; a mismatch suggests the gate schedule failed to apply correctly. Monitoring ieee8021TransmissionOverrun for a rising count reveals that time-critical frames are being delayed past their scheduled gate window, indicating clock synchronization or oversubscription problems. The ieee8021STMaxSDUTable/Entry lets an admin confirm per-traffic-class frame size limits (ieee8021STMaxSDU) match the expected TSN stream configuration, and ieee8021STNotifications would fire traps when overruns occur.

What Can Be Monitored

  • gate enabled state
  • administrative vs operational gate states
  • gate control list length
  • per-traffic-class maximum SDU
  • transmission overrun events
Imported Objects

From IEEE8021-BRIDGE-MIB

ieee8021BridgeBaseComponentIdOBJECT-TYPE
ieee8021BridgeBasePortOBJECT-TYPE

From IEEE8021-TC-MIB

ieee802dot1mibsOBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using ieee8021TransmissionOverrun OID:

Select a device implementing IEEE8021-ST-MIB 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 ieee8021TransmissionOverrun 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. It reports a counter of transmission overrun events, where a PDU is still being transmitted by a MAC at the time when the transmission gate for the queue closed. 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 Counter64-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 802.1 vendor-private MIB for Stream Reservation Protocol (SRP) and stream management on bridged networks.

Start monitoring Vendor-neutral IEEE 802.1Qbv standard (TSN-capable Ethernet bridge/switch, scheduled traffic) 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 IEEE8021-ST-MIB