CISCO-ATM-RM-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsCISCO-ATM-RM-MIB

Organization: Cisco System Inc.

Last Updated: 2002-06-03

Category: ATM

Description: Manages ATM Resource Management (RM) cells and available bit rate control on Cisco devices.

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What Is CISCO-ATM-RM-MIB?

CISCO-ATM-RM-MIB is a Cisco proprietary MIB that complements the standard IETF ATM MIBs by adding Resource Management (RM) functionality for Cisco ATM switches, covering Available Bit Rate (ABR) congestion control and QoS objective configuration. Its data spans configuration (oversubscription factor, SCR margin factor, per-service-category QoS objectives such as max cell transfer delay, peak-to-peak cell delay variation, and cell loss ratio) and performance/queue-status data (shared-memory queued cell counts per switch). As a performance and configuration MIB it lets an administrator tune and verify how aggressively the switch manages ABR congestion notification and confirm actual queued-cell levels are within the configured QoS objectives, revealing congestion buildup before cell loss occurs. It explicitly complements the standard ATM MIBs, indicating a functional dependency on the broader IETF ATM MIB framework for base ATM interface and connection objects. It is typically deployed on Cisco ATM switching platforms carrying multiple traffic classes where fine-grained QoS and congestion control tuning is required. Engineers can download the CISCO-ATM-RM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-ATM-RM-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

  • Cisco ATM switch

Monitoring Examples

An administrator reads rmSwitchOverSubFactor and rmSwitchAbrCongNotify to understand how the switch is configured to react to oversubscription and ABR congestion signaling. Walking rmDefaultQosObjectiveTable / rmDefaultQosObjectiveEntry by rmScDefaultQosServiceCategory shows the configured rmScDefaultQosMaxCtd, rmScDefaultQosPeakToPeakCdv, and rmScDefaultQosClr targets per service category, which can be compared against actual measured performance. Polling sharedMemRmSwitchQueuedCellTable / sharedMemRmSwitchQueuedCellEntry reveals rising queued-cell counts that, combined with an unusually high rmSwitchScrMarginFactor, would indicate the switch is approaching congestion and may soon violate its configured QoS objectives.

What Can Be Monitored

  • ABR congestion notification setting
  • QoS objectives per service category (delay, CDV, cell loss ratio)
  • shared-memory queued cell count
  • oversubscription factor
Imported Objects

From CISCO-SMI

ciscoExperimentOBJECT-IDENTITY

From RFC1213-MIB

ifIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using rmIfScRcacResultNumAdmit OID:

Select a Cisco ATM switch 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 rmIfScRcacResultNumAdmit 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 number of successful resource allocation requests for this interface. 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

ATM resource management and connection admission control for Cisco ATM interfaces.

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Download CISCO-ATM-RM-MIB