Optics and Hardware Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

Alarm troubleshooting

Updated: June 16, 2026

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Introduces alarm troubleshooting and explains the core idea and technical context. Highlights the main characteristics and usage guidance needed before configuration.

In this latest release, we bring forth advanced features to elevate your alarm management experience.

LOL Alarm Suppression: Prioritize the detection and handling of critical LOS-P (Loss of Signal-Payload) alarms by suppressing LOL (Loss of Line) alarms when LOS-P alarms are generated.
Clearing Static Counters: Gain the ability to clear alarm static counters using the command clear counters controller coherentDSP location, facilitating focused monitoring within a specific time frame.
Warning Suppression: Enhance your monitoring environment by suppressing warnings when the corresponding alarm is triggered, effectively preventing redundant or repetitive alerts.

Additional details

These enhancements collectively contribute to improved alarm prioritization, precise monitoring, and streamlined management, ensuring a more efficient and responsive approach to network events.

This section contains the procedures for troubleshooting alarms.

CD alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The Chromatic Dispersion (CD) alarm is raised when the detected chromatic dispersion value is above or below the configured threshold values.

Clear the CD alarm

Follow this task to clear the CD alarm.

Procedure

Configure threshold value within range if CD value is not within the threshold range.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

DGD alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The Differential Group Delay (DGD) alarm is raised when the value of the differential group delay read by the pluggable port module exceeds the configured threshold value.

Clear the DGD alarm

Follow this task to clear the DGD alarm.

Procedure

	1.	Configure the threshold value within range if DGD value is not within the threshold range.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

FLEXO_LOF alarm

Default Severity: Critical

Logical Object: OTN

Flexo LOF alarm is raised when loss of alignment is detected on the Flexo frame for more than 3ms.

Clear the FLEXO_LOF alarm

Follow this task to clear the FLEXO_LOF alarm.

Procedure

	1.	Identify and correct the underlying cause of mis-alignment. The Flexo LOF (Loss of Frame) alarm is cleared when good alignment is detected on the Flexo frame for more than 3ms.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

FLEXO_LOM alarm

Default Severity: Critical

Logical Object: OTN

Flexo LOM (Loss of Multi-Frame) is raised when loss of multi-frame alignment is detected on the Flexo multi-frame for more than 10ms

Clear the FLEXO_LOM alarm

Follow this task to clear the FLEXO_LOM alarm.

Procedure

	1.	Identify and correct the underlying cause of mis-alignment. The Flexo LOM alarm is cleared when good multi-frame alignment is detected on the Flexo multi-frame.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-LASERBIAS alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The HI-LASERBIAS alarm is raised when the physical pluggable port laser detects a laser bias value beyond the configured high threshold.

Clear the HI-LASERBIAS alarm

Follow this task to clear the HI-LASERBIAS alarm.

Procedure

	1.	Configure the threshold value within range if high laser bias threshold value is not within the threshold range.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-RXPOWER alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The HI-RXPOWER alarm occurs on the client optics controller when the measured individual lane optical signal power of the received signal exceeds the default threshold. The HI-RXPOWER alarm occurs on the trunk optics controller when the total optical signal power of the received signal exceeds the default threshold.

Clear the HI-RXPOWER alarm

Follow this task to clear the HI-RXPOWER alarm.

Procedure

	1.	Physically verify by using a standard power meter that the optical input power is overcoming the expected power threshold. Connect an attenuator accordingly.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-RXPOWER warn

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Software

The HI-RXPOWER warning occurs on the client optics controller when the measured individual lane optical signal power of the received signal exceeds the default threshold. The HI-RXPOWER warning occurs on the trunk optics controller when the total optical signal power of the received signal exceeds the default threshold.

Clear the HI-RXPOWER warn alarm

Follow this task to clear the HI-RXPOWER warn alarm.

Procedure

	1.	Physically verify by using a standard power meter that the optical input power is overcoming the expected power threshold. Connect an attenuator accordingly.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-TEMP alarm

Default Severity: Critical

Logical Object: Software

The HI-TEMP alarm occurs when the optical module temperature exceeds the default threshold.

Clear the HI-TEMP alarm

Follow this task to clear the HI-TEMP alarm.

Procedure

	1.	Verify the fan is intact and empty slots are blocked for cooling
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-TEMP warn

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Software

The HI-TEMP warning occurs when the optical module temperature exceeds the default threshold.

Clear the HI-TEMP warn alarm

Follow this task to clear the HI-TEMP warn alarm.

Procedure

	1.	Verify the fan is intact and empty slots are blocked for cooling.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-TXPOWER alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The HI-TXPOWER alarm occurs on the client optics controller when the measured individual lane optical signal power of the transmitted signal exceeds the default threshold. The HI-TXPOWER alarm occurs on the trunk optics controller when the total optical signal power of the transmitted signal exceeds the default threshold.

Clear the HI-TXPOWER alarm

Follow this task to clear the HI-TXPOWER alarm.

Procedure

	1.	Physically verify by using a standard power meter that the optical output power is overcoming the expected power threshold.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

HI-TXPOWER warn

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Software

The HI-TXPOWER warning occurs on the client optics controller when the measured individual lane optical signal power of the transmitted signal exceeds the default threshold. The HI-TXPOWER warning occurs on the trunk optics controller when the total optical signal power of the transmitted signal exceeds the default threshold.

Clear the HI-TXPOWER warn alarm

Follow this task to clear the HI-TXPOWER warn alarm.

Procedure

	1.	Physically verify by using a standard power meter that the optical output power is overcoming the expected power threshold.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

IMPROPER-REM alarm

Default Severity: Critical

Logical Object: Software

The Improper Removal alarm is raised when a physical pluggable is not present on a service-provisioned port.

Clear the IMPROPER-REM alarm

Follow this task to clear the IMPROPER-REM alarm.

Procedure

	1.	Insert the appropriate QSFP.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LOF alarm

Default Severity: Critical

Logical Object: OTN

Flexo LOF alarm is raised when loss of alignment is detected on the Flexo frame for more than 3ms.

Clear the LOF alarm

Follow this task to clear the LOF alarm.

Procedure

	1.	Identify and correct the underlying cause of mis-alignment. The Flexo LOF (Loss of Frame) alarm is cleared when good alignment is detected on the Flexo frame for more than 3ms.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LOL alarm

Default Severity: Major

Logical Object: Software

Loss of lock (LOL) alarm is raised when Loss of lock is detected on the receive side of the CDR (Clock and Data Recovery)

Clear the LOL alarm

Follow this task to clear the LOL alarm.

Procedure

	1.	Verify the fiber and power levels.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LOM alarm

Default Severity: Critical

Logical Object: OTN

Flexo LOM (Loss of Multi-Frame) is raised when loss of multi-frame alignment is detected on the Flexo

multi-frame for more than 10ms

Clear the LOM alarm

Follow this task to clear the LOM alarm.

Procedure

	1.	Identify and correct the underlying cause of mis-alignment. The Flexo LOM alarm is cleared when good multi-frame alignment is detected on the Flexo multi-frame.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LO-RXPOWER alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The LO-RXPOWER alarm is raised on the client or trunk optics controller when the measured individual lane optical signal power of the received signal falls below the default threshold.

Clear the LO-RXPOWER alarm

Follow this task to clear the LO-RXPOWER alarm.

Procedure

Verify that the trunk-rx port is cabled correctly, and clean the fiber connecting the faulty TXP/MXP card to the drop port of the DWDM card.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LO-RXPOWER warn

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Software

The LO-RXPOWER warning is raised on the client or trunk optics controller when the measured individual lane optical signal power of the received signal falls below the default threshold.

Clear the LO-RXPOWER warn alarm

Follow this task to clear the LO-RXPOWER warn alarm.

Procedure

Verify that the trunk-rx port is cabled correctly, and clean the fiber connecting the faulty TXP/MXP card to the drop port of the DWDM card.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LOS alarm

Default Severity: Major

Logical Object: Software

This alarm occurs when there is a loss of signal

Clear the LOS alarm

Follow this task to clear the LOS alarm.

Procedure

	1.	Identify and correct the underlying cause of signal LOS. The alarm is cleared when signal is improved.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LOS-P alarm

Default Severity: Minor

Logical Object: OTN

This alarm occurs when there is a loss of signal.

Clear the LOS-P alarm

Follow this task to clear the LOS-P alarm.

Procedure

	1.	Identify and correct the underlying cause of signal LOS. The alarm is cleared when signal is improved.
	2.	If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

LO-TXPOWER alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The LO-TXPOWER alarm is raised on the client or trunk optics controller when the measured individual lane optical signal power of the transmitted signal falls below the default threshold.

Clear the LO-TXPOWER alarm

LO-TXPOWER warn

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Software

The LO-TXPOWER warning is raised on the client or trunk optics controller when the measured individual lane optical signal power of the transmitted signal falls below the default threshold.

Clear the LO-TXPOWER warn alarm

OOR_CD alarm

Default Severity: Minor

Logical Object: Controller

This alarm occurs when the Chromatic Dispersion is out of range

Clear the OOR_CD alarm

Clear the OOR_CD alarm

Follow this task to clear the OOR_CD alarm.

Procedure

	1.	Verify the value of the OOR_CD alarm on Cisco 8000 using the show controller optics R/S/I/P command.
	2.	If the value is not within the OOR_CD threshold range, configure the threshold value using the controller optics R/S/I/P command in the config mode.
	3.	If the alarm does not clear, contact TAC. If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

OSNR alarm

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The Optical Signal Noise Ratio (OSNR) alarm occurs when the measured OSNR falls below the threshold.

Clear the OSNR alarm

Clear the OSNR alarm

Follow this task to clear the OSNR alarm.

Procedure

	1.	Verify the value of the OSNR alarm on Cisco 8000 using the show controller optics R/S/I/P command.
	2.	If the value is not within the OSNR threshold range, configure the minimum acceptable OSNR value using the controller optics R/S/I/P osnr-low-threshold command in the config mode. The range is 0 to 4000 (in units of 01db).
	3.	If the value is within the range of the minimum acceptable OSNR, contact TAC . If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

UNC-WORD alarm

Default Severity: Not Reported (NR), Not-Alarmed, Non-Service-Affecting (NSA)

Logical Object: OTN

The Uncorrected FEC Word (UNC-WORD) condition is raised when the FEC is unable to correct the frame.

Clear the UNC-WORD alarm

Clear the UNC-WORD alarm

Follow this task to clear the UNC-WORD alarm.

Procedure

	1.	Ensure that the fiber connector for the card is completely plugged in.
	2.	Ensure that the ports on the far end and near end nodes have the same port rates and FEC settings.
	3.	If the BER threshold is correct and at the expected level, use an optical test set to measure the power level of the line to ensure it is within guidelines. For specific procedures to use the test set equipment, consult the manufacturer.
	4.	If the optical power level is good, verify that the optical receive levels are within the acceptable range.
	5.	If receive levels are good, clean the fibers at both ends.
	6.	If the condition does not clear, verify that a single-mode fiber is used.
	7.	Verify if the fiber is of single-mode type.
	8.	Clean the fiber connectors at both ends for a signal degrade. If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

WVL-OOL alarm

Default Severity: Major

Logical Object: Controller

The Wavelength Out of Lock alarm is raised when the port detects the optical input frequency to be out of range.

Clear the WVL-OOL alarm

Clear the WVL-OOL alarm

Follow this task to clear the WVL-OOL alarm.

Procedure

	1.	Verify the wavelength configuration.
	2.	Verify whether the pluggable is inserted properly. If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

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