FR-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › FR-MIB

Organization: Nortel Networks

Last Updated: 1999-07-01

Category: Frame Relay, Standard: IETF

Description: Frame Relay generic MIB providing DLCI management, circuit statistics, and network-to-user interface management objects for Frame Relay access devices.

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What Is FR-MIB?

FR-MIB is a vendor-neutral Frame Relay MIB providing management objects for Frame Relay network interfaces, DLCIs (data link connection identifiers), and LMI (Local Management Interface) signaling parameters on Frame Relay access devices. It exposes per-interface configuration such as frame size, interface/LMI type, and DCE/DTE-side LMI timer parameters (N391, N392, N393), alongside a PVC/DLCI table for circuit-level status. Its monitoring role centers on WAN link and software/protocol status: an operator can confirm whether a Frame Relay interface and its PVCs are enabled and correctly negotiated per the LMI protocol, revealing misconfigured or down permanent virtual circuits rather than exposing physical sensor data. It builds on and complements the standard IF-MIB for the underlying physical/serial interface and the DLCI concepts standardized in RFC 2115/1315-era Frame Relay MIBs. It is typically deployed on WAN routers and Frame Relay access devices in legacy carrier or enterprise WAN links, and the FR-MIB RFC lineage (RFC 2115/1315) remains a useful reference for understanding its object definitions.

IPNetwork Monitor allows you to monitor SNMP objects defined in FR-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

  • vendor-neutral, standards-based MIB, not tied to a specific manufacturer
  • Frame Relay access router/WAN device

Monitoring Examples

An admin would walk nnfrTable/nnfrTableEntry to check nnfrIfEnable and nnfrEnablePvcAll, confirming that Frame Relay is administratively enabled on an interface and that PVCs are permitted, and would inspect nnfrLmiType alongside nnfrLmiDceN392/nnfrLmiDceN393 or nnfrLmiDteN392/nnfrLmiDteN391 to verify the LMI error-threshold and monitored-event-count parameters match on both ends of the link. A mismatch in nnfrFrameSize or nnfrIfType versus the carrier's provisioned service would reveal a misconfigured Frame Relay circuit causing frame drops.

What Can Be Monitored

  • Frame Relay interface enable state
  • PVC/DLCI enable state
  • frame size
  • interface/LMI type
  • LMI timer and threshold parameters (N391/N392/N393)
Imported Objects

From BUNDLE-MIB

nnbundleIdOBJECT-TYPE

From NT-ENTERPRISE-DATA-MIB

ntEnterpriseDataTasmanMgmtOBJECT-IDENTITY

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TruthValue

How to Use in IPNetwork Monitor

Example using nnfrStatsFramesRx OID:

Select a device implementing FR-MIB 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 nnfrStatsFramesRx 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. Numbers of frames 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, 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

Defines managed objects for Frame Relay network interfaces and services, as specified in RFC 2954, managing FR circuits, traffic, and statistics.

Start monitoring Vendor-neutral Frame Relay access router/WAN device, any manufacturer 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 FR-MIB