CISCO-OPTICAL-MONITORING-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2001-12-04

Category: Cisco Devices, Optical and WDM

Description: Monitors optical signal parameters such as power levels, wavelength, and signal quality on optical interfaces.

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What Is CISCO-OPTICAL-MONITORING-MIB?

CISCO-OPTICAL-MONITORING-MIB monitors optical-layer operating parameters of Cisco network elements that convert electrical data to optical signals, transmit/receive it, and convert it back — i.e., transponders/optical interfaces on DWDM and metro optical platforms. It exposes transmit and receive optical parameters such as bias current, transmit power, laser temperature, and AC/DC-coupled receive power. This is fundamentally a hardware-health monitoring MIB: comTxPower, comTxLaserTemp, comTxBiasCurrent, and comRxPowerAC let an operator detect a degrading laser, an overheating transmitter, or a weakening received signal well before the optical link actually fails. It is a companion to interface- and connection-oriented MIBs (such as the standard interfaces MIB and Cisco's metro/optical MIBs) that provide the logical port context for these physical measurements. It is typically deployed on Cisco DWDM/optical transport network elements in metro and long-haul optical networks. Network engineers evaluating or troubleshooting this functionality can download the CISCO-OPTICAL-MONITORING-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-OPTICAL-MONITORING-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 DWDM/optical transport network elements

Monitoring Examples

An operator would poll comParametersTable/comParametersEntry to read comTxPower and compare it against comTxPowerSupported to confirm the transmitter is operating within its rated range, while comTxBiasCurrent trending upward over time often signals laser aging. comTxLaserTemp (when comTxLaserTempSupported indicates it's available) helps catch a cooling problem before it degrades the laser further. On the receive side, comRxPowerAC (checked against comRxPowerACSupported) reveals a weakening incoming optical signal, which combined with rising bit errors elsewhere would point to a fiber or connector degradation issue.

What Can Be Monitored

transmit optical power
transmit bias current
laser temperature
receive optical power (AC-coupled)
parameter support flags for capability discovery

Imported Objects

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using comTxBiasCurrent OID:

Select a Cisco DWDM optical transport platform 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 comTxBiasCurrent 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. This holds the value of the laser diode forward bias current for the interface being instrumented, and is an indication of the Tx optical power. 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 an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the value drifts significantly from its normal baseline, since an unexpected change often points to a real underlying issue. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoOpticalMonitoringMIB	1.3.6.1.4.1.9.10.83			This MIB module is used to monitor optical parameters of a network element.This MIB deals with the operating parameters of the optical layer. The optical layer is a term that defines all the devices/systems that deal with the conversion of data in it's electrical form to optical form, transmission of the optical data, reception, and finally re-conversion to electrical signals.
ciscoOpticalMonMIBObjects	1.3.6.1.4.1.9.10.83.1
comParameters	1.3.6.1.4.1.9.10.83.1.1
comParametersTable	1.3.6.1.4.1.9.10.83.1.1.1		not-accessible	This table lists the instrumented parameters of all interfaces on the network element whose optical parameters are to be monitored.
comParametersEntry	1.3.6.1.4.1.9.10.83.1.1.1.1		not-accessible	Only the ifIndices of optical interfaces whose parameters need to be monitored will be used to index this table.
I32 comTxBiasCurrentEx	1.3.6.1.4.1.9.10.83.1.1.1.1.1	Integer32	read-only	This holds the value of the laser diode forward bias current for the interface being instrumented, and is an indication of the Tx optical power.
T/F comTxPowerSupported	1.3.6.1.4.1.9.10.83.1.1.1.1.2	TruthValue	read-only	Boolean to indicate if the interface being instrumented supports comTxPower. comTxPowerSupported is set to true if the interface supports the comTxPower object, and set to false otherwise.
I32 comTxPower	1.3.6.1.4.1.9.10.83.1.1.1.1.3	Integer32	read-only	This object holds the value of the transmitter optical power for the interface being instrumented. The optical is proportional to the laser diode current. This object makes sense only if comTxPowerSupported is true. All values must be converted to microWatts.
T/F comTxLaserTempSupported	1.3.6.1.4.1.9.10.83.1.1.1.1.4	TruthValue	read-only	Boolean to indicate if the interface being instrumented supports comTxLaserTemp. comTxLaserTempSupported is set to true if the interface supports the comTxLaserTemp object, and set to false otherwise.
I32 comTxLaserTemp	1.3.6.1.4.1.9.10.83.1.1.1.1.5	Integer32	read-only	This object holds the value of the transmitter laser diode temperature for the interface being instrumented. This object indicates the health of the transmitter.
I32 comRxPowerACDC	1.3.6.1.4.1.9.10.83.1.1.1.1.6	Integer32	read-only	This object holds the value of the total power (AC + DC) at the optical Rx of the interface. All values must be converted to microWatts.
T/F comRxPowerACSupported	1.3.6.1.4.1.9.10.83.1.1.1.1.7	TruthValue	read-only	Boolean to indicate if comRxPowerAC is supported by the interface being instrumented. comRxPowerACSupported is set to true if the interface supports the comRxPowerAC object,and set to false otherwise.
I32 comRxPowerAC	1.3.6.1.4.1.9.10.83.1.1.1.1.8	Integer32	read-only	This object holds the value of the AC power at the optical Receiver of the interface. Not all interfaces support this object.This object makes sense only if comRxPowerACSupported is true. All values must be converted to microWatts.
ciscoOpticalMonMIBNotifPrefix	1.3.6.1.4.1.9.10.83.2
ciscoOpticalMonMIBNotifications	1.3.6.1.4.1.9.10.83.2.0
ciscoOpticalMonMIBConformance	1.3.6.1.4.1.9.10.83.3
ciscoOpticalMonMIBCompliances	1.3.6.1.4.1.9.10.83.3.1
ciscoOpticalMonMIBCompliance	1.3.6.1.4.1.9.10.83.3.1.1			The compliance statement for entities which implement the Cisco Optical Monitoring MIB.
ciscoOpticalMonMIBGroups	1.3.6.1.4.1.9.10.83.3.2
ciscoOpticalMonMIBParamGroup	1.3.6.1.4.1.9.10.83.3.2.1			Parameters of the optical interfaces.

RFC description

Monitors physical parameters of optical interfaces including signal strength, power levels, and optical layer operating parameters.

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Download CISCO-OPTICAL-MONITORING-MIB