PRVT-CFM-MIB

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › PRVT-CFM-MIB

Organization: BATM Advanced Communication

Last Updated: 2014-04-17

Category: Carrier Ethernet

Description: Manages BATM Advanced Communication IEEE 802.1ag Connectivity Fault Management (CFM) MEP/MIP configuration and OAM results.

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What Is PRVT-CFM-MIB?

PRVT-CFM-MIB is a BATM Advanced Communication proprietary extension MIB implementing IEEE 802.1ag Connectivity Fault Management (CFM), a Carrier Ethernet OAM technology area used to detect link and service faults in Ethernet networks. It exposes configuration and operational data for CFM Maintenance End Points (MEPs) and Maintenance Intermediate Points (MIPs), including the maintenance domain/association stack, direction, and associated interface and MAC address. Its monitoring value is software/protocol-state health rather than physical hardware -- it lets an operator confirm CFM sessions are correctly stacked on the right interface and service, and detect faults or misconfigurations in the fault-management overlay itself (e.g. a stack shutdown via prvtCfmShutdown). As a vendor extension of the IEEE 802.1ag standard, it depends directly on that standard's CFM data model and is meant to be used alongside the standard CFM MIB. It is deployed on BATM carrier Ethernet switches/aggregation nodes used by service providers for Ethernet OAM and SLA fault detection, and operators typically consult a PRVT-CFM-MIB MIB Browser view to map out these stack and MEP objects before writing polling scripts.

IPNetwork Monitor allows you to monitor SNMP objects defined in PRVT-CFM-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

  • BATM Advanced Communication carrier Ethernet switches/aggregation nodes

Monitoring Examples

An operator would poll prvtCfmStackTable entries (prvtCfmStackInterfaceIndex, prvtCfmStackMdLevel, prvtCfmStackDirection, prvtCfmStackMaName, prvtCfmStackMepId, prvtCfmStackMacAddress) to verify a MEP is correctly stacked at the expected maintenance domain level on a given interface. Checking prvtCfmUpdateInterval alongside prvtCfmShutdown would reveal whether CFM monitoring on a stack has been disabled, which would explain a loss of fault visibility on that service. Notifications from prvtCfmMIBNotifications would be watched for CFM-detected connectivity faults between MEPs.

What Can Be Monitored

  • CFM MEP/MIP stack configuration
  • maintenance domain level and direction
  • MEP MAC address
  • CFM monitoring shutdown state
  • connectivity fault notifications
Imported Objects

From IF-MIB

InterfaceIndex

From PRVT-SWITCH-MIB

switchOBJECT-IDENTITY

From SNMPv2-SMI

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

From SNMPv2-TC

MacAddress
RowStatus
TAddress
TDomain
TEXTUAL-CONVENTION
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using prvtCfmMepCcmSequenceErrors OID:

Select a BATM carrier Ethernet switches/aggregation node 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 prvtCfmMepCcmSequenceErrors 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 number of out-of-sequence CCMs received from all remote MEPs. 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

Extends Connectivity Fault Management (CFM) for IEEE 802.1ag on BATM T-Metro switches with proprietary management objects.

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Download PRVT-CFM-MIB