1-136
Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.11.2 AIS-V on DS3XM-6 or DS3XM-12 Unused VT Circuits
1.11.2 AIS-V on DS3XM-6 or DS3XM-12 Unused VT Circuits
Symptom An incomplete circuit path causes an AIS.
Possible Cause The port on the reporting node is in-service but a node upstream on the circuit does
not have an OC-N port in service.
Recommended Action An AIS-V indicates that an upstream failure occurred at the virtual tributary
(VT) layer. AIS-V alarms also occur on DS3XM-6 and DS3XM-12 VT circuits that are not carrying
traffic and on stranded bandwidth. Complete the “Clear AIS-V on DS3XM-6 or DS3XM-12 Unused
VT Circuits” procedure on page 1-136.
Clear AIS-V on DS3XM-6 or DS3XM-12 Unused VT Circuits
Step 1 Determine the affected port.
Step 2 Record the node ID, slot number, port number, or VT number.
Step 3 Create a unidirectional VT circuit from the affected port back to itself, such as
Source node/Slot 2/Port 2/VT 13 cross connected to Source node/Slot 2/Port 2/VT 13.
Step 4 Uncheck the Bidirectional check box in the circuit creation window.
Step 5 Give the unidirectional VT circuit an easily recognizable name, such as delete me.
Step 6 Open the DS3XM-6 card in CTC card view. Click the Maintenance > DS1 tabs.
Step 7 Locate the VT that is reporting the alarm (for example, DS3 #2, DS1 #13).
Step 8 From the Loopback Type list, choose Facility and click Apply.
Step 9 Click Circuits.
Step 10 Find the one-way circuit you created in Step 3. Select the circuit and click Delete. Do not check any
check boxes.
Step 11 Click Yes in the Delete Confirmation dialog box.
Step 12 Open the DS3XM-6 or DS3XM-12 card in CTC card view. Click Maintenance > DS1 tabs.
Step 13 Locate the VT in Facility Loopback.
Step 14 From the Loopback Type list, choose None and then click Apply.
Step 15 Click the Alarms tab and verify that the AIS-V alarms have cleared.
Step 16 Repeat this procedure for all the AIS-V alarms on the DS3XM-6 or DS3XM-12 cards.
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