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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.10.13 “Path in Use Error” When Creating a Circuit
1.10.13 “Path in Use Error” When Creating a Circuit
Symptom While creating a circuit, you get a “Path in Use” error that prevents you from completing the
circuit creation.
Possible Cause Another user has already selected the same source port to create another circuit.
Recommended Action CTC does not remove a card or port from the available list until a circuit is
completely provisioned. If two users simultaneously select the same source port to create a circuit,
the first user to complete circuit provisioning gets use of the port. The other user will get the “Path
in Use” error. Cancel the circuit creation and start over, or click the Back button until you return to
the initial circuit creation window. The source port that was previously selected no longer appears
in the available list because it is now part of a provisioned circuit. Select a different available port
and begin the circuit creation process again.
1.10.14 Calculate and Design IP Subnets
Symptom You cannot calculate or design IP subnets on the ONS 15454 SDH.
Possible Cause The IP capabilities of the ONS 15454 SDH require specific calculations to properly
design IP subnets.
Recommended Action Cisco provides a free online tool to calculate and design IP subnets. Go to
http://www.cisco.com/techtools/ip_addr.html. For information about ONS 15454 SDH IP
capability, refer to the Cisco ONS 15454 SDH Reference Manual Chapter 12, “CTC Network
Connectivity.”
1.10.15 Ethernet Connections
Symptom Ethernet connections appear to be broken or are not working properly.
Possible Cause Improperly seated connections.
Possible Cause Incorrect connections.
Recommended Action You can fix most connectivity problems in an Ethernet network by following a
few guidelines. See Figure 1-49. Complete the “Verify Ethernet Connections” procedure on
page 1-129.
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