NBS-EUSM-MIB

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › NBS-EUSM-MIB

Organization: MRV

Last Updated: 2007-10-10

Category: MRV In-Reach Console / Terminal Server, Management & Admin Interfaces

Description: Manages MRV NBS enhanced user-space module configuration and operational state.

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What Is NBS-EUSM-MIB?

NBS-EUSM-MIB is an MRV Communications proprietary SNMP module (under the nbs enterprise branch used by MRV's NBS product line) managing the Enhanced User-Space Module (EUSM), a per-slot feature set on MRV chassis-based switching equipment. It exposes per-slot objects covering access-control tagging behavior, VLAN ID list assignment, link aggregation administrative/operational state, and storm-control thresholds for broadcast, multicast, and unicast traffic. As a configuration-and-operational-state MIB, it is used to monitor whether individual chassis slots support the EUSM feature, whether link aggregation is administratively configured versus actually operational on that slot, and whether storm-control burst-size thresholds are properly guarding against traffic floods. It is MRV/NBS proprietary and does not appear to build on any shared IETF MIB, relying instead on MRV's own chassis slot-indexing conventions. It is typically deployed on MRV NBS modular Ethernet switch/media-converter chassis in metro or enterprise access network deployments, where administrators can get the NBS-EUSM-MIB download to load into their SNMP management tools.

IPNetwork Monitor allows you to monitor SNMP objects defined in NBS-EUSM-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 NBS modular Ethernet switches/media-converter chassis

Monitoring Examples

An administrator would poll nbsEusmSlotTable keyed by slot to check nbsEusmSlotSupportsEusm and confirm nbsEusmSlotLinkAggrAdmin against nbsEusmSlotLinkAggrOper to catch a slot where link aggregation was configured but never came operationally up. Reviewing nbsEusmSlotStormControlBroadcast, nbsEusmSlotStormControlMulticast, and nbsEusmSlotStormControlUnicast alongside nbsEusmSlotStormBurstSize would reveal whether storm-control thresholds are set appropriately or whether a slot is passing an abnormal burst of traffic. Access-control objects like nbsEusmSlotAccControlActionTag/Untag and nbsEusmSlotAccControlVidList would show which VLANs are tagged versus untagged for that slot's access control policy.

What Can Be Monitored

  • per-slot EUSM feature support
  • link aggregation admin vs. operational state
  • storm-control thresholds (broadcast/multicast/unicast)
  • storm-control burst size
  • access-control VLAN tagging configuration
Imported Objects

From NBS-CMMC-MIB

nbsOBJECT-IDENTITY
nbsCmmcPortEntryOBJECT-TYPE
nbsCmmcSlotEntryOBJECT-TYPE

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
RowStatus
StorageType

How to Use in IPNetwork Monitor

Example using nbsEusmPmAvgAllSizes OID:

Select an MRV Communications NBS modular Ethernet switch/media-converter chassis (EUSM) 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 nbsEusmPmAvgAllSizes into the Find box to locate it in the OID tree, then select it and click OK. The average transit time (nanosec) for monitored 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 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

MRV EUSM board slot context, port features, and testing capabilities for network interface modules.

Start monitoring MRV Communications NBS modular Ethernet switch/media-converter chassis (EUSM) 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 NBS-EUSM-MIB