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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.67 EXT
Step2 If the port has the correct flow rate and duplex setting, troubleshoot the network device connected to the
node and the network management LAN.
Step3 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call CiscoTAC (1-800-553-2447).
2.7.67 EXT
Default Severity: Minor(MN), Non-Service-Affecting (NSA)
SONET Logical Object: ENVALRM
A Failure Detected External to the NE alarm occurs because an environmental alarm is present. For
example, a door could be open or flooding could have occurred.

Clear the EXT Alarm

Step1 Follow your standard operating procedure to remedy environmental conditions that cause alarms. The
alarm clears when the situation is remedied.
Step2 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call CiscoTAC (1-800-553-2447).
2.7.68 EXTRA-TRAF-PREEMPT
The EXTRA-TRAF-PREEMPT alarm is not used in the ONS 15310 platforms in this release. It is
reserved for future development.
2.7.69 FAILTOSW
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
The Failure to Switch to Protection Facility condition occurs when a working or protect optical facility
switches to its companion port by using a MANUAL command. For example, if you attempt to manually
switch traffic from an unused protect port to an in-service working port, the switch will fail (because
traffic is already present on the working port) and you will see the FAILTOSW condition.

Clear the FAILTOSW Condition

Step1 Look up and troubleshoot the higher-priority alarm. Clearing the higher-priority condition frees the port
and clears the FAILTOSW.
Step2 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call CiscoTAC (1-800-553-2447).