MRV-EFM-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsMRV-EFM-MIB

Organization: MRV Communications, Inc.

Last Updated: 2003-06-23

Category: LAN Management, OAM

Description: Manages MRV Communications Ethernet in the First Mile port and OAM configuration.

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What Is MRV-EFM-MIB?

MRV-EFM-MIB is a vendor-specific MIB from MRV Communications, Inc. that models IEEE 802.3ah Ethernet in the First Mile (EFM) Operations, Administration, and Maintenance (OAM) sublayer on MRV network devices. It defines the mrvEfmOamTable (indexed by mrvEfmPhysicalIfIndex), exposing per-link OAM state such as mrvEfmOamMode (passive/active), mrvEfmOamAdminState, mrvEfmOamPeerIfIndex, and a large set of OAMPDU counters (mrvEfmOamPDUTx/Rx, mrvEfmOamInformationTx/Rx, mrvEfmOamLoopbackControlTx/Rx, mrvEfmOamVariableRequestTx/Rx) plus errored-symbol and errored-frame event thresholds and counts. This data is useful for monitoring the health of first-mile Ethernet links between an MRV device and its remote OAM peer, since OAM PDU exchange rates and error-event counters reveal link-layer faults before they escalate into service outages. It depends on standard interface indexing from MIB-II (via the imported InterfaceIndex) and is deployed on MRV Ethernet access/aggregation devices supporting 802.3ah OAM. Network engineers who need to inspect this module's object definitions can download the MRV-EFM-MIB file to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in MRV-EFM-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

  • MRV Communications 802.3ah-capable Ethernet access/aggregation devices

Monitoring Examples

An operator polls mrvEfmOamAdminState and mrvEfmOamOperState on a given mrvEfmPhysicalIfIndex to confirm OAM is enabled and running, then checks mrvEfmOamErrSymPerEvtCount and mrvEfmOamFramesLostDueToOamError; a rising errored-symbol count combined with an operational-state bit indicating 'administratively disabled' would flag a degraded first-mile link needing attention.

What Can Be Monitored

  • OAM administrative/operational state
  • OAM PDU transmit/receive counters
  • errored-symbol period event counts
  • errored-frame period event counts
  • peer interface OAM mode (active/passive)
  • frames lost due to OAM error
Imported Objects

From NBS-CMMC-MIB

InterfaceIndex
nbsOBJECT-IDENTITY

From SNMPv2-CONF

OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using mrvEfmOamPDUTx OID:

Select an MRV Communications 802.3ah-capable Ethernet access/aggregation device 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 mrvEfmOamPDUTx 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 OAMPDUs passed to the OAM subordinate sublayer for transmission. 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

Manages 802.3ah Ethernet in the First Mile (EFM) for MRV devices supporting high-speed last-mile connectivity.

Start monitoring MRV Communications 802.3ah-capable Ethernet access/aggregation device 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 MRV-EFM-MIB