TN-LINK-OAM-MIB

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Organization: Transition Networks, Inc.

Last Updated: 2013-05-28

Category: Ethernet OAM, Transition Networks Media Converters

Description: Manages Transition Networks IEEE 802.3ah link OAM discovery and event notification.

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What Is TN-LINK-OAM-MIB?

This is a Transition Networks vendor MIB implementing IEEE 802.3ah Ethernet Link OAM for point-to-point Ethernet links on TN switches and media converters. It exposes per-port OAM capability flags (loopback support, link monitoring support, remote MIB retrieval support), loopback control, and OAM PDU statistics counters. It is used in monitoring hardware/link health by tracking link-fault and dying-gasp PDU counts, which reveal a remote device power loss or physical layer fault, and by allowing remote loopback tests to verify link integrity. It builds directly on the IEEE 802.3ah (Clause 57) Link OAM standard that defines the discovery, monitoring, and remote-loopback mechanisms it implements. It is typically deployed on managed Ethernet access/aggregation switches and media converters at the edge of carrier or industrial networks where remote link diagnostics are valuable. Engineers can download the TN-LINK-OAM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-LINK-OAM-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

Transition Networks managed Ethernet switches
Ethernet media converters

Monitoring Examples

An admin would monitor the tnLinkOamStatisticsTable (tnLinkOamStatisticsEntry) counters tnLinkOamLinkfaultPDUsRx/Tx and tnLinkOamDyingGaspRx to detect when a remote peer signals an imminent link fault or unexpected power-down. The tnLinkOamPortConfigTable exposes per-port tnLinkOamLoopbackSupport and tnLinkOamLinkMonitorSupport flags, and tnLinkOamLoopbackOperation can be set to trigger a remote loopback test for cable/link verification. A spike in dying-gasp events across multiple ports would suggest a power outage affecting remote-end equipment.

What Can Be Monitored

link-fault PDU counts
dying gasp events
loopback support/operation state
link monitor support
remote MIB retrieval capability

Imported Objects

From DOT3-OAM-MIB

dot3OamEntry	OBJECT-TYPE
dot3OamEventConfigEntry	OBJECT-TYPE
dot3OamPeerEntry	OBJECT-TYPE
dot3OamStatsEntry	OBJECT-TYPE

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-SMI

Counter32
Counter64
Integer32
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
TimeStamp
TruthValue

From TRANSITION-SMI

tnProducts

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using tnLinkOamLinkfaultPDUsRx OID:

Select a Transition Networks managed Ethernet switches, Ethernet media converter (802.3ah Link OAM/loopback status) 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 tnLinkOamLinkfaultPDUsRx 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 count of the number of Link fault PDU's received. 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 (in frames), 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

OID symbolic	OID numeric	Type	Access	Description
tnLinkOamMIB	1.3.6.1.4.1.868.2.5.140			The mib module for managing Link OAM.
tnLinkOamNotifications	1.3.6.1.4.1.868.2.5.140.0
tnLinkOamObjects	1.3.6.1.4.1.868.2.5.140.1
tnLinkOamPortConfigTable	1.3.6.1.4.1.868.2.5.140.1.1		not-accessible	This table allows the user to inspect the current Link OAM port configurations, and change them as well.
tnLinkOamPortConfigEntry	1.3.6.1.4.1.868.2.5.140.1.1.1		not-accessible	An entry in the table that contains information of OAM port configurations.
INT tnLinkOamLoopbackSupport	1.3.6.1.4.1.868.2.5.140.1.1.1.1	INTEGER	read-write	Controls whether the loopback support is enabled for the switch port. Link OAM remote loopback can be used for fault localization and link performance testing. Enabling the loopback support will allow the DTE to execute the remote loopback command that helps in the fault detection.
INT tnLinkOamLinkMonitorSupport	1.3.6.1.4.1.868.2.5.140.1.1.1.2	INTEGER	read-write	Controls whether the Link Monitor support is enabled for the switch port. On enabling the Link Monitor support, the DTE supports event notification that permits the inclusion of diagnostic information.
INT tnLinkMIBRetrievalSupport	1.3.6.1.4.1.868.2.5.140.1.1.1.3	INTEGER	read-write	Controls whether the MIB Retrieval Support is enabled for the switch port. On enabling the MIB retrieval support, the DTE supports polling of various Link OAM based MIB variables' contents.
INT tnLinkOamLoopbackOperation	1.3.6.1.4.1.868.2.5.140.1.1.1.4	INTEGER	read-write	If the Loopback support is enabled, enabling this field will start a loopback operation for the port.
tnLinkOamStatisticsTable	1.3.6.1.4.1.868.2.5.140.1.2		not-accessible	This table contains statistics for the OAM function on a particular Ethernet-like interface. There is an entry in the table for every entry in the tnLinkOamTable. The displayed counters represent the total number of OAM frames received and transmitted for the selected port. Discontinuities of these counter can occur at re-initialization of the management system.
tnLinkOamStatisticsEntry	1.3.6.1.4.1.868.2.5.140.1.2.1		not-accessible	An entry in the table containing statistics information on the Ethernet OAM function for a single Ethernet-like interface.
C32 tnLinkOamLinkfaultPDUsRxEx	1.3.6.1.4.1.868.2.5.140.1.2.1.1	Counter32	read-only	A count of the number of Link fault PDU's received.
C32 tnLinkOamLinkfaultPDUsTx	1.3.6.1.4.1.868.2.5.140.1.2.1.2	Counter32	read-only	A count of the number of Link fault PDU's transmitted.
C32 tnLinkOamDyingGaspRx	1.3.6.1.4.1.868.2.5.140.1.2.1.3	Counter32	read-only	A count of the number of Dying Gasp events received.
C32 tnLinkOamDyingGaspTx	1.3.6.1.4.1.868.2.5.140.1.2.1.4	Counter32	read-only	A count of the number of Dying Gasp events transmitted.
C32 tnLinkOamCriticalEventPDUsRx	1.3.6.1.4.1.868.2.5.140.1.2.1.5	Counter32	read-only	A count of the number of Critical event PDU's received.
C32 tnLinkOamCriticalEventPDUsTx	1.3.6.1.4.1.868.2.5.140.1.2.1.6	Counter32	read-only	A count of the number of Critical event PDU's transmitted.
tnLinkOamLocalPortConfigStatusTable	1.3.6.1.4.1.868.2.5.140.1.3		not-accessible	This table provides Local Link OAM configuration operational status.
tnLinkOamLocalPortConfigStatusEntry	1.3.6.1.4.1.868.2.5.140.1.3.1		not-accessible	An entry in the table containing information of Peer Link OAM configuration operational status.
INT tnLinkOamPDUPermission	1.3.6.1.4.1.868.2.5.140.1.3.1.1	INTEGER	read-only	This field is available only for the Local DTE. It displays the current permission rules set for the local DTE. Possible values are 'Link fault', 'Receive only', 'Information exchange only', 'ANY'.
INT tnLinkOamLocalMultiplexerState	1.3.6.1.4.1.868.2.5.140.1.3.1.2	INTEGER	read-only	When in forwarding state, the Device is forwarding non-OAMPDUs to the lower sublayer. Incase of discarding, the device discards all the non-OAMPDU's.
INT tnLinkOamLocalParserState	1.3.6.1.4.1.868.2.5.140.1.3.1.3	INTEGER	read-only	When in forwarding state, Device is forwarding non-OAMPDUs to higher sublayer. When in loopback, Device is looping back non-OAMPDUs to the lower sublayer. When in discarding state, Device is discarding non-OAMPDUs.
STR tnLinkOamLocalOrganizationalUniqueIdentifi	1.3.6.1.4.1.868.2.5.140.1.3.1.4	DisplayString	read-only	24-bit Organizationally Unique Identifier of the vendor.
tnLinkOamPeerPortConfigStatusTable	1.3.6.1.4.1.868.2.5.140.1.4		not-accessible	This table provides Peer Link OAM configuration operational status.
tnLinkOamPeerPortConfigStatusEntry	1.3.6.1.4.1.868.2.5.140.1.4.1		not-accessible	An entry in the table containing information of Peer Link OAM configuration operational status.
INT tnLinkOamPeerMultiplexerState	1.3.6.1.4.1.868.2.5.140.1.4.1.1	INTEGER	read-only	When in forwarding state, the Device is forwarding non-OAMPDUs to the lower sublayer. Incase of discarding, the device discards all the non-OAMPDU's.
INT tnLinkOamPeerParserState	1.3.6.1.4.1.868.2.5.140.1.4.1.2	INTEGER	read-only	When in forwarding state, Device is forwarding non-OAMPDUs to higher sublayer. When in loopback, Device is looping back non-OAMPDUs to the lower sublayer. When in discarding state, Device is discarding non-OAMPDUs.
STR tnLinkOamPeerOrganizationalUniqueIdentifi	1.3.6.1.4.1.868.2.5.140.1.4.1.3	DisplayString	read-only	24-bit Organizationally Unique Identifier of the vendor.
tnLinkOamLinkEventStatusTable	1.3.6.1.4.1.868.2.5.140.1.5		not-accessible	This table shows frame error status.
tnLinkOamLinkEventStatusEntry	1.3.6.1.4.1.868.2.5.140.1.5.1		not-accessible	An entry in the table containing information of frame error status.
U32 tnLinkOamLocationIndex	1.3.6.1.4.1.868.2.5.140.1.5.1.1	Unsigned32	not-accessible	The index of the loacation of the OAM unit event status accessed. When the value of index is '1', the table will display the Event status for the Local OAM unit. While the value is '2', the table will display the status for the Peer for the respective port.
C32 tnLinkOamSequenceNumber	1.3.6.1.4.1.868.2.5.140.1.5.1.2	Counter32	read-only	This two-octet field indicates the total number of events occurred at the remote end.
TIM tnLinkOamFrameErrorEventTimestamp	1.3.6.1.4.1.868.2.5.140.1.5.1.3	TimeStamp	read-only	This two-octet field indicates the time reference when the event was generated, in terms of 100 ms intervals.
C32 tnLinkOamFrameErrorEventWindow	1.3.6.1.4.1.868.2.5.140.1.5.1.4	Counter32	read-only	This two-octet field indicates the duration of the period in terms of 100 ms intervals. 1) The default value is one second. 2) The lower bound is one second. 3) The upper bound is one minute.
C32 tnLinkOamFrameErrorEventThreshold	1.3.6.1.4.1.868.2.5.140.1.5.1.5	Counter32	read-only	This four-octet field indicates the number of detected errored frames in the period is required to be equal to or greater than in order for the event to be generated. 1) The default value is one frame error. 2) The lower bound is zero frame errors. 3) The upper bound is unspecified.
C32 tnLinkOamFrameErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.6	Counter32	read-only	This four-octet field indicates the number of detected errored frames in the period.
C64 tnLinkOamTotalFrameErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.7	Counter64	read-only	This eight-octet field indicates the sum of errored frames that have been detected since the OAM sublayer was reset.
C32 tnLinkOamTotalFrameErrorEvents	1.3.6.1.4.1.868.2.5.140.1.5.1.8	Counter32	read-only	This four-octet field indicates the number of Errored Frame Event TLVs that have been generated since the OAM sublayer was reset.
TIM tnLinkOamFramePeriodErrorEventTimestamp	1.3.6.1.4.1.868.2.5.140.1.5.1.9	TimeStamp	read-only	This two-octet field indicates the time reference when the event was generated, in terms of 100 ms intervals.
C32 tnLinkOamFramePeriodErrorEventWindow	1.3.6.1.4.1.868.2.5.140.1.5.1.10	Counter32	read-only	This four-octet field indicates the duration of period in terms of frames.
C32 tnLinkOamFramePeriodErrorEventThreshold	1.3.6.1.4.1.868.2.5.140.1.5.1.11	Counter32	read-only	This four-octet field indicates the number of errored frames in the period is required to be equal to or greater than in order for the event to be generated.
C32 tnLinkOamFramePeriodsErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.12	Counter32	read-only	This four-octet field indicates the number of frame errors in the period.
C64 tnLinkOamTotalFramePeriodsErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.13	Counter64	read-only	This eight-octet field indicates the sum of frame errors that have been detected since the OAM sublayer was reset.
C32 tnLinkOamTotalFramePerioderrorEvents	1.3.6.1.4.1.868.2.5.140.1.5.1.14	Counter32	read-only	This four-octet field indicates the number of Errored Frame Period Event TLVs that have been generated since the OAM sublayer was reset.
TIM tnLinkOamSymbolPeriodErrorEventTimestamp	1.3.6.1.4.1.868.2.5.140.1.5.1.15	TimeStamp	read-only	This two-octet field indicates the time reference when the event was generated, in terms of 100 ms intervals.
C64 tnLinkOamSymbolPeriodErrorEventWindow	1.3.6.1.4.1.868.2.5.140.1.5.1.16	Counter64	read-only	This eight-octet field indicates the number of symbols in the period.
C64 tnLinkOamSymbolPeriodErrorEventThreshold	1.3.6.1.4.1.868.2.5.140.1.5.1.17	Counter64	read-only	This eight-octet field indicates the number of errored symbols in the period is required to be equal to or greater than in order for the event to be generated.
C64 tnLinkOamSymbolPeriodsErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.18	Counter64	read-only	This eight-octet field indicates the number of symbol errors in the period.
C64 tnLinkOamSymbolFramePeriodErrors	1.3.6.1.4.1.868.2.5.140.1.5.1.19	Counter64	read-only	This eight-octet field indicates the sum of symbol errors since the OAM sublayer was reset.
C32 tnLinkOamTotalSymbolFramePerioderrorEvents	1.3.6.1.4.1.868.2.5.140.1.5.1.20	Counter32	read-only	This four-octet field indicates the number of Errored Symbol Period Event TLVs that have been generated since the OAM sublayer was reset.
TIM tnLinkOamEventSecondsSummaryTimestamp	1.3.6.1.4.1.868.2.5.140.1.5.1.21	TimeStamp	read-only	This two-octet field indicates the time reference when the event was generated, in terms of 100 ms intervals, encoded as a 16-bit unsigned integer.
C32 tnLinkOamEventSecondsSummaryWindow	1.3.6.1.4.1.868.2.5.140.1.5.1.22	Counter32	read-only	This two-octet field indicates the duration of the period in terms of 100 ms intervals, encoded as a 16-bit unsigned integer.
C32 tnLinkOamEventSecondsSummaryThreshold	1.3.6.1.4.1.868.2.5.140.1.5.1.23	Counter32	read-only	This two-octet field indicates the number of errored frame seconds in the period is required to be equal to or greater than in order for the event to be generated, encoded as a 16-bit unsigned integer.
C32 tnLinkOamEventSecondsSummarysEvents	1.3.6.1.4.1.868.2.5.140.1.5.1.24	Counter32	read-only	This two-octet field indicates the number of errored frame seconds in the period, encoded as a 16-bit unsigned integer.
C32 tnLinkOamEventSecondsSummaryErrorTotal	1.3.6.1.4.1.868.2.5.140.1.5.1.25	Counter32	read-only	This four-octet field indicates the sum of errored frame seconds that have been detected since the OAM sublayer was reset.
C32 tnLinkOamTotalEventSecondsSummaryEventTotal	1.3.6.1.4.1.868.2.5.140.1.5.1.26	Counter32	read-only	This four-octet field indicates the number of Errored Frame Seconds Summary Event TLVs that have been generated since the OAM sublayer was reset, encoded as a 32bit unsigned integer.
tnLinkOamConformance	1.3.6.1.4.1.868.2.5.140.2

RFC description

Ericsson MINI-LINK TN enterprise SNMP MIB module defining OAM (Operations, Administration, and Maintenance) objects for network link monitoring and management on MINI-LINK TN microwave transmission systems.

Start monitoring Transition Networks managed Ethernet switches, Ethernet media converters (802.3ah Link OAM/loopback status) 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 TN-LINK-OAM-MIB