TN-MRP-MIB

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Organization: Transition Networks

Last Updated: 2012-10-22

Description: MIB for Media Redundancy Protocol (MRP/IEC 62439-2) statistics, domain configuration, and fault notifications on Transition Networks switches

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What Is TN-MRP-MIB?

This Transition Networks MIB manages the Media Redundancy Protocol (MRP, IEC 62439-2), an Ethernet ring-topology redundancy mechanism used in industrial networks. It exposes per-domain MRP timing parameters (topology-change interval/repeat count, test intervals) and ring-health related settings such as media-redundancy checking and non-blocking MRC support. It supports monitoring of the network's fault-tolerance status by tracking test-monitoring counts and link-up/link-down interval settings, which reveal whether ring nodes are correctly detecting breaks and how quickly the ring reconverges after a fault, functioning as a topology/fault-health indicator rather than a hardware-health one. It directly implements the IEC 62439-2 Media Redundancy Protocol standard that defines the ring-manager/ring-client roles and timers it configures. It is typically deployed on Transition Networks industrial Ethernet switches used in ring topologies for factory automation, utility, or transportation networks requiring sub-second failover, where TN-MRP-MIB SNMP monitoring validates that ring convergence performance meets those tight requirements.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-MRP-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 industrial Ethernet ring switches

Monitoring Examples

An engineer would review the tnMrpDomainTable (tnMrpDomainEntry) for a ring domain to check tnMrpDomainTestMonitoringCount and tnMrpDomainTestMonitoringExtendedCount, where a rapidly rising count can indicate the ring manager is repeatedly detecting and healing breaks. Comparing tnMrpDomainLinkDownInterval/tnMrpDomainLinkUpInterval against expected failover time helps validate ring convergence performance meets requirements. tnMrpDomainCheckMediaRedundancy and tnMrpDomainNonBlockingMRCsupported indicate whether redundancy checking and non-blocking client mode are active for that domain.

What Can Be Monitored

ring test/monitoring counts
topology change interval and repeat count
link up/down failover intervals
media redundancy checking status

Imported Objects

From IEC-62439-2-MIB

mrpDomainIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32
enterprises

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using tnMrpDomainTransmitTotalCount OID:

Select a Transition Networks industrial Ethernet ring switch (MRP ring-health/test-monitoring 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 tnMrpDomainTransmitTotalCount 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. The total transmitted frames. 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

OID symbolic	OID numeric	Type	Access	Description
tnMrpMIB	1.3.6.1.4.1.868.2.5.120			A MIB module provides Media Redundancy Protocol Statistics interface.
tnMrpObjects	1.3.6.1.4.1.868.2.5.120.1
tnMrpDomainTable	1.3.6.1.4.1.868.2.5.120.1.1		not-accessible	Every entry in this table contains additional information about a Media Redundancy Protocol (MRP) domain. Row entries can not be created or deleted via SNMP operations.
tnMrpDomainEntry	1.3.6.1.4.1.868.2.5.120.1.1.1		not-accessible	An entry in the tnMrpDomainTable.
I32 tnMrpDomainTopologyChangeInterval	1.3.6.1.4.1.868.2.5.120.1.1.1.1	Integer32	read-create	This attribute specifies the interval for sending MRP_TopologyChange frames.
I32 tnMrpDomainTopologyChangeRepeatCount	1.3.6.1.4.1.868.2.5.120.1.1.1.2	Integer32	read-create	This attribute specifies the interval count which controls repeated transmissions of MRP_TopologyChange frames.
I32 tnMrpDomainDefaultTestInterval	1.3.6.1.4.1.868.2.5.120.1.1.1.3	Integer32	read-create	This attribute specifies the default interval for sending MRP_Test frames on ring ports.
I32 tnMrpDomainShortTestInterval	1.3.6.1.4.1.868.2.5.120.1.1.1.4	Integer32	read-create	This attribute specifies the short interval for sending MRP_Test frames on ring ports after link changes in the ring.
I32 tnMrpDomainTestMonitoringCount	1.3.6.1.4.1.868.2.5.120.1.1.1.5	Integer32	read-create	This attribute specifies the interval count for monitoring the reception of MRP_Test frames.
INT tnMrpDomainNonBlockingMRCsupported	1.3.6.1.4.1.868.2.5.120.1.1.1.6	INTEGER	read-create	This attribute specifies the ability of the MRM to support MRCs without BLOCKED port state support in the ring.
I32 tnMrpDomainTestMonitoringExtendedCount	1.3.6.1.4.1.868.2.5.120.1.1.1.7	Integer32	read-create	This attribute specifies the extended interval count for monitoring the reception of MRP_Test frames.
INT tnMrpDomainCheckMediaRedundancy	1.3.6.1.4.1.868.2.5.120.1.1.1.8	INTEGER	read-create	This attribute specifies whether monitoring of MRM state is enabled or disabled in the redundancy domain.
I32 tnMrpDomainLinkDownInterval	1.3.6.1.4.1.868.2.5.120.1.1.1.9	Integer32	read-create	This attribute specifies the interval for sending MRP_LinkDown frames on ring ports.
I32 tnMrpDomainLinkUpInterval	1.3.6.1.4.1.868.2.5.120.1.1.1.10	Integer32	read-create	This attribute specifies the interval for sending MRP_LinkUp frames on ring ports.
I32 tnMrpDomainLinkChangeCount	1.3.6.1.4.1.868.2.5.120.1.1.1.11	Integer32	read-create	This attribute specifies the MRP_LinkChange frame count which controls repeated transmission of MRP_LinkChange frames.
tnMrpDomainStatTable	1.3.6.1.4.1.868.2.5.120.1.2		not-accessible	Every entry in this table contains statistics about a Media Redundancy Protocol (MRP) domain. Entries cannot be created or deleted via SNMP operations.
tnMrpDomainStatEntry	1.3.6.1.4.1.868.2.5.120.1.2.1		not-accessible	An entry in the mrpDomainStatTable.
C64 tnMrpDomainTransmitTotalCountEx	1.3.6.1.4.1.868.2.5.120.1.2.1.1	Counter64	read-only	The total transmitted frames.
C64 tnMrpDomainReceiveTotalCount	1.3.6.1.4.1.868.2.5.120.1.2.1.2	Counter64	read-only	The total received frames.
C64 tnMrpDomainReceiveErrorTotalCount	1.3.6.1.4.1.868.2.5.120.1.2.1.3	Counter64	read-only	The total received frames with error.
C64 tnMrpDomainReceiveUnrecognizedCount	1.3.6.1.4.1.868.2.5.120.1.2.1.4	Counter64	read-only	The total unrecognized received frames.
T/F tnMrpDomainStatTableReset	1.3.6.1.4.1.868.2.5.120.1.3	TruthValue	read-write	Write true(1) will cause a reset of all statistic values
tnMrpDomainEventTable	1.3.6.1.4.1.868.2.5.120.1.4		read-only	Every entry in this table contains event about a Media Redundancy Protocol (MRP) domain. Entries cannot be created or deleted via SNMP operations.
tnMrpDomainEventEntry	1.3.6.1.4.1.868.2.5.120.1.4.1		not-accessible	An entry in the mrpDomainEventTable.
U32 tnMrpDomainEventIndex	1.3.6.1.4.1.868.2.5.120.1.4.1.1	Unsigned32	not-accessible	An arbitrary integer for identifying individual events within the event log.
TIM tnMrpDomainEventTimestamp	1.3.6.1.4.1.868.2.5.120.1.4.1.2	TimeStamp	read-only	The value of sysUpTime at the time of the logged event.
TNM tnMrpDomainEventType	1.3.6.1.4.1.868.2.5.120.1.4.1.3	TnMRPEventType	read-only	Event type
TNM tnMrpDomainEventAppear	1.3.6.1.4.1.868.2.5.120.1.4.1.4	TnMRPEventAppear	read-only	Event appear or disappear
T/F tnMrpDomainEventTableReset	1.3.6.1.4.1.868.2.5.120.1.5	TruthValue	read-write	Write true(1) will cause a reset of all events

RFC description

Supplies Media Redundancy Protocol (MRP) statistics and domain management for Transition Networks devices.

Start monitoring Transition Networks industrial Ethernet ring switches (MRP ring-health/test-monitoring 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.

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