Troubleshooting Threshold Alarm Problems

This chapter describes how to troubleshoot threshold alarm problems. This chapter contains the following sections:

7.1 Overview

Threshold alarms indicate that a configured range is exceeded.

Follow this initial checklist before proceeding with the troubleshooting procedures:

•Issue show interfaces commands to ensure that all interfaces are administratively up and that there are no reported errors.

•Issue the show facility-alarm status command to display the alarms on the interfaces.

•Ensure that all optical connectors are clean. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

This section contains troubleshooting procedures for threshold alarm problems.

Symptom An 8b10b CVRD alarm indicates signal fail or signal degrade.

Table 7-1 describes the potential causes of the symptom and the solutions.

Table 7-1 8b10b CVRD Alarm Indicates Signal Fail or Signal Degrade
Possible Problem	Solution
Excessive attenuation or overloading on a 2.5-Gbps transponder interface.	1. Measure the receive power level. Ensure that it is within -28 dBm and -8 dBm. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.
Excessive attenuation or overloading on a 10-GE transponder interface.	1. Measure the receive power level. Ensure that it is within -22 dBm and -8 dBm. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

Symptom A CDL-HEC alarm indicates signal fail or signal degrade.

Table 7-2 describes the potential causes of the symptom and the solutions.

Table 7-2 CDL-HEC Alarm Indicates Signal Fail or Signal Degrade
Possible Problem	Solution
Excessive attenuation or overloading on a 10-GE transponder interface.	1. Measure the receive power level. Ensure that it is within -22 dBm and -8 dBm. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

Symptom A 64b66b CVRD alarm indicates signal fail or signal degrade.

Table 7-3 describes the potential causes of the symptom and the solutions.

Table 7-3 64b66b CVRD Alarm Indicates Signal Fail or Signal Degrade
Possible Problem	Solution
Excessive attenuation or overloading on a 10-GE transponder interface.	1. Measure the receive power level. Ensure that it is within -22 dBm and -8 dBm. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

Symptom A B1 CVRD alarm indicates signal fail or signal degrade.

Table 7-4 describes the potential causes of the symptom and the solutions.

Table 7-4 B1 CVRD Alarm Indicates Signal Fail or Signal Degrade
Possible Problem	Solution
Excessive attenuation or overloading on a SONET/SDH interface.	1. Measure the receive power level. Ensure that it is within -25 dBm and -8 dBm for a multimode interface and within -19 dBm and -1.5 dBm for a single mode interface. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

Symptom Threshold exceeded messages continuously hitting the console.

Table 7-5 describes the potential cause of the symptom and the solution.

Table 7-5 Threshold Exceeded Messages Continuously Hitting the Console
Possible Problem	Solution
Receive signal is fluctuating on the edge of the configured threshold.	1. Measure the interface receive power level. Ensure that it is within specifications. Adjust the attenuation if necessary. 2. Check the network cable for sharp bends and ensure the connectors are clean and connected properly. Refer to the Cisco ONS 15540 ESPx Cleaning Procedures for Fiber Optic Connections document.

Symptom SNMP traps are not generated.

Table 7-6 describes the potential cause of the symptom and the solution.

Table 7-6 SNMP Traps Are Not Generated
Possible Problem	Solution
SNMP configuration is incorrect.	Issue the show running-config command to verify the SNMP configuration and correct if necessary.