CMM3-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBs › CMM3-MIB

Organization: Motorola

Last Updated: 2003-05-15

Category: DOCSIS and Cable

Description: Provides management objects for CMM3 cable modem hardware monitoring and configuration.

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What Is CMM3-MIB?

CMM3-MIB provides management objects for a CMM3 cable headend hardware module used in DOCSIS cable networks, covering configuration, operational status, GPS timing reference, and switch/redundancy state. It exposes distinct object groups for status (cmmStatus), configuration (cmmConfig), redundancy switching (cmmSwitch), GPS reference (cmmGps), and a historical event log (cmmEventLog), giving it broad coverage of both configuration and operational health data. This MIB is squarely a hardware-status monitoring MIB: the status and event-log objects surface operational faults and state changes, while the GPS objects are critical because loss of GPS lock can affect the timing synchronization the cable network depends on for DOCSIS operation. It is a self-contained vendor MIB for this specific hardware module rather than an extension of a broader IETF standard. It is deployed in cable operator headends where CMM3 modules provide timing and redundancy management for the surrounding cable plant equipment. Engineers can download the CMM3-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CMM3-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

  • cable headend CMM3 hardware module

Monitoring Examples

An operator polls cmmStatus to check the CMM3 unit's overall operational health and cmmGps to confirm the GPS receiver still has a valid lock, since loss of GPS sync can degrade DOCSIS timing across the plant. The cmmSwitch objects reveal whether the unit has failed over to a redundant path, and cmmEventLog provides a history of state-change and fault events an operator would review after an alarm to determine root cause.

What Can Be Monitored

  • overall unit operational status
  • GPS receiver lock/sync status
  • redundancy switch state
  • configuration parameters
  • historical event/alarm log entries

This MIB depends on

Related MIBs

Imported Objects

From SNMPv2-CONF

OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Gauge32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString

From WHISP-GLOBAL-REG-MIB

whispBoxOBJECT-IDENTITY
whispCMMOBJECT-IDENTITY
whispModulesOBJECT-IDENTITY

From WHISP-TC-MIB

EventString
WhispLUID
WhispMACAddress

How to Use in IPNetwork Monitor

Example using txDropPkts OID:

Select a cable headend hardware module 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 txDropPkts into the Find box to locate it in the OID tree, then select it and click OK. This counter is incremented every time a transmit packet is dropped due to lack of resources (e.g., transmit FIFO underflow), or an internal MAC sublayer transmit error not counted by in either the TxLateCollision or the TxExcessiveCollision counters. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Compaq/HP Compaq Modular Management (CMM3) baseboard management controller MIB for hardware health and blade management.

Start monitoring cable headend hardware modules 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 CMM3-MIB