DDM-MGMT-MIB

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Organization: D-Link Corp.

Last Updated: 2009-04-30

Category: Network Interfaces, Optical and WDM

Description: Manages Digital Diagnostic Monitoring (DDM) data for optical transceiver modules.

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What Is DDM-MGMT-MIB?

DDM-MGMT-MIB is a switch-vendor enterprise MIB implementing Digital Diagnostic Monitoring (DDM) for pluggable optical transceiver modules (SFP/SFP+), a capability standardized at the transceiver hardware level (SFF-8472) and exposed here via SNMP. It provides per-port transceiver status including temperature, supply voltage, laser bias current, and transmit/receive optical power, plus a threshold management table for setting alarm/warning limits. It is a pure hardware-health monitoring MIB, letting administrators detect an overheating, under-powered, or degrading optical module — e.g. rising bias current or falling RX power signaling laser aging or a failing fiber connection — well before the link actually drops. It is a proprietary encoding of the industry-standard SFF-8472 DDM data model and is typically deployed alongside standard IF-MIB interface counters. Typical deployment is a managed Ethernet switch with SFP/SFP+ uplinks where each port's optical transceiver health is tracked for proactive fiber and optics maintenance. Engineers can download the DDM-MGMT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DDM-MGMT-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

managed Ethernet switch with SFP/SFP+ optical ports

Monitoring Examples

An admin would poll swDdmStatusTable/swDdmStatusEntry per swDdmPort for swDdmTemperature, swDdmVoltage, swDdmBiasCurrent, swDdmTxPower, and swDdmRxPower to baseline each transceiver's operating envelope. Comparing current readings against limits set in swDdmThresholdMgmtTable/swDdmThresholdMgmtEntry, with swDdmTrapState/swDdmLogState enabled, would surface an SFP whose swDdmRxPower has dropped below threshold — indicating fiber attenuation or a failing transceiver — well before the interface itself reports down.

What Can Be Monitored

transceiver temperature
transceiver voltage
laser bias current
TX optical power
RX optical power
DDM alarm/warning thresholds

Imported Objects

From DLINK-ID-REC-MIB

dlink-common-mgmt

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
swDdmMIB	1.3.6.1.4.1.171.12.72			The structure of DDM for the proprietary enterprise.
swDdmCtrl	1.3.6.1.4.1.171.12.72.1
INT swDdmTrapState	1.3.6.1.4.1.171.12.72.1.1	INTEGER	read-write	This object indicates the trap action state.
INT swDdmLogState	1.3.6.1.4.1.171.12.72.1.2	INTEGER	read-write	This object indicates the log action state.
swDdmInfo	1.3.6.1.4.1.171.12.72.2
swDdmStatus	1.3.6.1.4.1.171.12.72.2.1
swDdmStatusTable	1.3.6.1.4.1.171.12.72.2.1.1		not-accessible	This table contains the DDM status information.
swDdmStatusEntry	1.3.6.1.4.1.171.12.72.2.1.1.1		not-accessible	This is an entry of the swDdmStatusTable.
INT swDdmPort	1.3.6.1.4.1.171.12.72.2.1.1.1.1	INTEGER	read-only	This object indicates the port.
STR swDdmTemperature	1.3.6.1.4.1.171.12.72.2.1.1.1.2	DisplayString	read-only	This object indicates the real time value of the temperature. As the value is a floating point data type, the DisplayString type is used to define this parameter.
STR swDdmVoltage	1.3.6.1.4.1.171.12.72.2.1.1.1.3	DisplayString	read-only	This object indicates the real time value of the supply voltage. As the value value is a floating point data type, the DisplayString type is used to define this parameter.
STR swDdmBiasCurrent	1.3.6.1.4.1.171.12.72.2.1.1.1.4	DisplayString	read-only	This object indicates the real time value of the tx bias.
STR swDdmTxPower	1.3.6.1.4.1.171.12.72.2.1.1.1.5	DisplayString	read-only	This object indicates the real time value of the tx power. As the value is a floating point data type, the DisplayString type is used to define this parameter.
STR swDdmRxPower	1.3.6.1.4.1.171.12.72.2.1.1.1.6	DisplayString	read-only	This object indicates the real time value of the rx power. As the value is a floating data type, the DisplayString type is used to define this parameter.
swDdmMgmt	1.3.6.1.4.1.171.12.72.3
swDdmThresholdMgmt	1.3.6.1.4.1.171.12.72.3.1
swDdmThresholdMgmtTable	1.3.6.1.4.1.171.12.72.3.1.1		not-accessible	This table contains DDM temperature configuration information.
swDdmThresholdMgmtEntry	1.3.6.1.4.1.171.12.72.3.1.1.1		not-accessible	This is an entry of the swDdmConfigThresholdTable.
INT swDdmThresholdType	1.3.6.1.4.1.171.12.72.3.1.1.1.1	INTEGER	read-only	This object indicates the threshold type.
STR swDdmHighAlarm	1.3.6.1.4.1.171.12.72.3.1.1.1.2	DisplayString	read-write	This object indicates the high alarm threshold value to be configured. As the value is a floating point data type, the DisplayString type is used to define this parameter.
STR swDdmLowAlarm	1.3.6.1.4.1.171.12.72.3.1.1.1.3	DisplayString	read-write	This object indicates the low alarm threshold value to be configured. As the value is a floating data type, the DisplayString type is used to define this parameter.
STR swDdmHighWarning	1.3.6.1.4.1.171.12.72.3.1.1.1.4	DisplayString	read-write	This object indicates the high warning threshold value to be configured. As the value is a floating data type, the DisplayString type is used to define this parameter.
STR swDdmLowWarning	1.3.6.1.4.1.171.12.72.3.1.1.1.5	DisplayString	read-write	This object indicates the low warning threshold value to be configured. As the value is a floating data type, the DisplayString type is used to define this parameter.
swDdmActionMgmt	1.3.6.1.4.1.171.12.72.3.2
swDdmActionMgmtTable	1.3.6.1.4.1.171.12.72.3.2.1		not-accessible	This table contains the configuration of the action taken when any parameter exceeds its threshold.
swDdmActionMgmtEntry	1.3.6.1.4.1.171.12.72.3.2.1.1		not-accessible	This is an entry of the swDdmConfigActionTable.
INT swDdmActionType	1.3.6.1.4.1.171.12.72.3.2.1.1.1	INTEGER	read-only	This object indicates the action type.
INT swDdmShutdown	1.3.6.1.4.1.171.12.72.3.2.1.1.2	INTEGER	read-write	This object indicates the shutdown action. The value 'other' means that the port does not support DDM.
INT swDdmTrapAndLog	1.3.6.1.4.1.171.12.72.3.2.1.1.3	INTEGER	read-write	This object indicates the trap and log action. The value 'other' means that the port does not support DDM.
swDdmPortMgmtTable	1.3.6.1.4.1.171.12.72.3.2.2		not-accessible	This table contains the configuration of the DDM state and shutdown mode when any parameter exceeds its threshold.
swDdmPortMgmtEntry	1.3.6.1.4.1.171.12.72.3.2.2.1		not-accessible	This is an entry of the swDdmPortMgmtTable.
INT swDdmPortState	1.3.6.1.4.1.171.12.72.3.2.2.1.1	INTEGER	read-write	This object indicates the DDM state information by port.
INT swDdmPortShutdown	1.3.6.1.4.1.171.12.72.3.2.2.1.2	INTEGER	read-write	This object indicates whether or not to shutdown the port on which the operating parameter exceeds the specified threshold.
swDdmNotify	1.3.6.1.4.1.171.12.72.4
swDdmNotifyPrefix	1.3.6.1.4.1.171.12.72.4.0
NTF swDdmAlarmTrap	1.3.6.1.4.1.171.12.72.4.0.1			The trap is sent when any parameter value exceeds the alarm threshold value or recover to normal status depending on the configuration of the trap action.
NTF swDdmWarningTrap	1.3.6.1.4.1.171.12.72.4.0.2			The trap is sent when any parameter value exceeds the warning threshold value or recover to normal status depending on the configuration of the trap action.
swDdmNotificationBinding	1.3.6.1.4.1.171.12.72.4.1
INT swDdmThresholdExceedType	1.3.6.1.4.1.171.12.72.4.1.1	INTEGER	accessible-for-notify	This object is used by swDdmAlarmTrap and swDdmWarningTrap to indicate if the threshold that was exceeded was a high threshold or a low threshold.
INT swDdmThresholdExceedOrRecover	1.3.6.1.4.1.171.12.72.4.1.2	INTEGER	accessible-for-notify	This object is used by swDdmAlarmTrap and swDdmWarningTrap,to indicate the GBIC is exceeding its ddm threshold or recover to normal status.

RFC description

Digital Diagnostic Monitoring (DDM) Management MIB; defines objects for optical transceiver monitoring including temperature, power, and signal integrity metrics.

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Download DDM-MGMT-MIB

What Is DDM-MGMT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description