TN-ELPS-MIB

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Category: Transition Networks Media Converters

Description: Manages Transition Networks Ethernet linear protection switching state and configuration.

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What Is TN-ELPS-MIB?

TN-ELPS-MIB is a Transition Networks proprietary SNMP MIB for Ethernet Linear Protection Switching (ELPS, per ITU-T G.8031), a mechanism providing fast failover between a working and protection path on a point-to-point Ethernet link. It exposes per-instance configuration such as protection architecture, working/protection flow port IDs, associated MEP IDs used for signal-fail detection, APS signaling, and switch direction. It is used to monitor the hardware/software status of the protection mechanism itself: whether the link is configured and which of the working or protection path is currently active, revealing whether a protection switchover has occurred due to a link failure. It depends on the underlying CFM/MEP infrastructure (802.1ag) for signal-fail detection, since the working/protection signal-fail MEP IDs reference MEPs on each path. It is deployed on Transition Networks Carrier Ethernet switches providing resilient point-to-point services in metro/access networks. Engineers can download the TN-ELPS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-ELPS-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 Carrier Ethernet switch

Monitoring Examples

An operator polls tnElpsCfgTable/tnElpsCfgEntry keyed by tnElpsInstance to check tnElpsConfigured and tnElpsDirection, confirming the protection group is active and correctly configured for unidirectional or bidirectional switching. tnElpsWSfMepId and tnElpsPSfMepId are cross-referenced against CFM MEP state to see which path (working via tnElpsWFlowPortId or protection via tnElpsPFlowPortId) currently reports a signal-fail condition, explaining an unexpected traffic path change. tnElpsApsMepId identifies the MEP carrying APS protocol messages between the two ends of the protected link.

What Can Be Monitored

ELPS instance configuration/active state
working vs protection path in use
signal-fail MEP state per path
protection architecture and direction

Imported Objects

From IEEE8021-CFM-MIB

Dot1agCfmMepId

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
RowStatus
TruthValue

From TN-PROTECTION-MIB

tnProtectionMIB

MODULE-IDENTITY

From TRANSITION-SMI

tnProducts

OBJECT-IDENTITY

OIDs

OID symbolic	OID numeric	Type	Access	Description
tnElpsMib	1.3.6.1.4.1.868.2.5.109.2
tnElpsMibNotifications	1.3.6.1.4.1.868.2.5.109.2.0
NTF tnElpsAlarmUp	1.3.6.1.4.1.868.2.5.109.2.0.1			A Elps has a persistent defect condition. A notification (fault alarm) is sent to the management entity with the OID of the Elps that has detected the fault. The management entity receiving the notification can identify the system from the network source address of the notification, and can identify the ELPS reporting the defect by the indices in the OID of the variables in the notification: tnElpsInstance - Also the index of the EPLS state table entry (tnElpsStateTable).
NTF tnElpsAlarmDown	1.3.6.1.4.1.868.2.5.109.2.0.2			A Elps has a persistent defect condition. A notification (fault alarm) is sent to the management entity with the OID of the Elps that has detected the fault. The management entity receiving the notification can identify the system from the network source address of the notification, and can identify the ELPS reporting the defect by the indices in the OID of the variables in the notification: tnElpsInstance - Also the index of the EPLS state table entry (tnElpsStateTable).
tnElpsMibObjects	1.3.6.1.4.1.868.2.5.109.2.1
tnElpsCfgMgmt	1.3.6.1.4.1.868.2.5.109.2.1.1
tnElpsCfgTable	1.3.6.1.4.1.868.2.5.109.2.1.1.1		not-accessible	This table provides configuration of ELPS.
tnElpsCfgEntry	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1		not-accessible	A entry in the table represents a configuration for ELPS.
U32 tnElpsInstance	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.1	Unsigned32	not-accessible	The ID of the ELPS.
INT tnElpsDomain	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.2	INTEGER	read-create	Port: This will create a ELPS in the Port Domain. 'W/P Flow' is a Port.
INT tnElpsArchitecture	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.3	INTEGER	read-create	Port: This will create a 1+1 ELPS. Port: This will create a 1:1 ELPS.
NUM tnElpsWFlowPortId	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.4	InterfaceIndex	read-create	The working flow for the ELPS - See 'Domain' above.
NUM tnElpsPFlowPortId	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.5	InterfaceIndex	read-create	The protecting flow for the ELPS - See 'Domain' above.
DOT tnElpsWSfMepId	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.6	Dot1agCfmMepId	read-create	The working Signal Fail reporting MEP.
DOT tnElpsPSfMepId	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.7	Dot1agCfmMepId	read-create	The protecting Signal Fail reporting MEP.
DOT tnElpsApsMepId	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.8	Dot1agCfmMepId	read-create	The APS PDU handling MEP.
T/F tnElpsConfigured	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.9	TruthValue	read-only	False: This ELPS is only created and has not yet been configured - is not active. True: This ELPS is configured - is active.
INT tnElpsDirection	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.10	INTEGER	read-create	Unidirectional: ELPS in the two ends can select traffic from different working/protecting flow. This is only possible in case of 1+1. Bidirectional: ELPS in the two ends is selecting traffic from the same working/protecting flow. This requires APS enabled. This is mandatory for 1:1.
T/F tnElpsApsEnable	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.11	TruthValue	read-create	The Automatic Protection Switching protocol can be enabled/disabled. This is mandatory for 1:1.
T/F tnElpsRevertiveEnable	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.12	TruthValue	read-create	The revertive switching to working flow can be enabled/disabled.
INT tnElpsWTRTime	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.13	INTEGER	read-create	The Wait To Restore timing value to be used in revertive switching.
INT tnElpsHoldOffTime	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.14	INTEGER	read-create	The timing value to be used to make persistent check on Signal Fail before switching.
INT tnElpsCmd	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.15	INTEGER	read-create	None: There is no active local command on this instance. Clear: The active local command will be cleared. Lock Out: This ELPS is locked to working (not active). In case of 1:N (more than one ELPS with same protecting flow) - when one ELPS switch to protecting flow, other ELPS is enforced this command Forced Switch: Forced switch to protecting. Manual Switch P: Manual switch to protecting. Manual Switch W: Manual switch to working - this is only possible in 1:1 non-revertive. Exercise: Exercise of the protocol - not traffic effecting. Freeze: This ELPS is locally freezed - ignoring all input. Lock Out Local: This ELPS is locally 'locked out' - ignoring local SF detected on working.
ROW tnElpsStatus	1.3.6.1.4.1.868.2.5.109.2.1.1.1.1.16	RowStatus	read-create	The status of the row. The writable columns in a row can not be changed if the row is active. All columns must have a valid value before a row can be activated.
tnElpsStateMgmt	1.3.6.1.4.1.868.2.5.109.2.1.2
tnElpsStateTable	1.3.6.1.4.1.868.2.5.109.2.1.2.1		not-accessible	This table provides configuration about ELPS state
tnElpsStateEntry	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1		not-accessible	This entry represents configuration about ELPS state
TNE tnElpsProtectionState	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.1	TnElpsProtSwitchState	read-only	ELPS Protection state
TNE tnElpsWFlowState	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.2	TnElpsDefectState	read-only	signalOk: State of working flow is ok signalFail: State of working flow is Signal Fail signalDegrade: State of working flow is Signal Degrade (for future use)
TNE tnElpsPFlowState	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.3	TnElpsDefectState	read-only	signalOk: State of protecting flow is ok signalFail: State of protecting flow is Signal Fail signalDegrade: State of protecting flow is Signal Degrade (for future use)
TNE tnElpsTransmitRequestType	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.4	TnElpsRequestType	read-only	The transmitted request type.
U32 tnElpsTransmitRequestedSignal	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.5	Unsigned32	read-only	The transmitted request signal.
U32 tnElpsTransmitBridgedSignal	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.6	Unsigned32	read-only	The transmitted bridged signal.
TNE tnElpsReceiveRequestType	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.7	TnElpsRequestType	read-only	The requested type that is received from APS.
U32 tnElpsReceiveRequestedSignal	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.8	Unsigned32	read-only	The requested signal received from APS.
U32 tnElpsReceiveBridgedSignal	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.9	Unsigned32	read-only	The bridged signal received from APS .
T/F tnElpsArchitectureMismatch	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.10	TruthValue	read-only	The architecture indicated in the received APS does not match the locally configured.
T/F tnElpsAPSOnWorking	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.11	TruthValue	read-only	APS is received on the working flow.
T/F tnElpsSwitchingIncomplete	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.12	TruthValue	read-only	Traffic is not selected from the same flow instance in the two ends.
T/F tnElpsNoApsReceived	1.3.6.1.4.1.868.2.5.109.2.1.2.1.1.13	TruthValue	read-only	APS PDU is not received from the other end.
tnElpsLinkOverMgmt	1.3.6.1.4.1.868.2.5.109.2.1.3
tnElpsLinkOverTable	1.3.6.1.4.1.868.2.5.109.2.1.3.1		not-accessible	This table provides configuration about ELPS Link Over based on the SOAM DM
tnElpsLinkOverEntry	1.3.6.1.4.1.868.2.5.109.2.1.3.1.1		not-accessible	This entry represents configuration about ELPS Link Over
T/F tnElpsLinkOverEnabled	1.3.6.1.4.1.868.2.5.109.2.1.3.1.1.1	TruthValue	read-write	The feature about the DM LinkOver can be enabled and disabeld. False: This feature is disabled. True: This ELPS is enabled.
U32 tnElpsLinkOverDeltaValue	1.3.6.1.4.1.868.2.5.109.2.1.3.1.1.2	Unsigned32	read-write	The Delta value is ranged from 6 to 120. If the value that is on one link subtract the other one is larger than the delta value, the data flow will be swithed to the link that own the better DM value.
tnElpsMibConformance	1.3.6.1.4.1.868.2.5.109.2.2

RFC description

Ethernet Linear Protection Switching (ELPS) for Transition Networks devices, managing working and protecting port failover.

Start monitoring Transition Networks Carrier Ethernet switch (ELPS working/protection path 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-ELPS-MIB

What Is TN-ELPS-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description