Cisco ONS 15454 Troubleshooting Manual page 112

1.5 Troubleshooting Ethernet Circuit Paths With Loopbacks
b.
c.
d.
If the test set indicates a faulty circuit, the problem might be a faulty card.
Step 5
Complete the
Step 6
Test the Optical Card
Complete the
Step 1
and replace it with a known-good card.
Resend test traffic on the loopback circuit with a known-good card.
Step 2
If the test set indicates a good circuit, the problem was probably the defective card. Return the defective
Step 3
card to Cisco through the RMA process. Contact Cisco Technical Support at 1 800 553-2447.
Complete the
Step 4
Clear the terminal loopback on the port:
Step 5
a.
b.
c.
d.
e.
f.
Clear the terminal loopback circuit:
Step 6
a.
b.
c.
d.
The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies
to carry live traffic.
1.5 Troubleshooting Ethernet Circuit Paths With Loopbacks
Facility loopbacks, terminal loopbacks, and cross-connect loopback circuits are often used together to
test the circuit path through the network or to logically isolate a fault. Performing a loopback test at each
point along the circuit path systematically isolates possible points of failure.
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-68
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
The entire circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
"Test the Optical Card" procedure on page
"Physically Replace a Traffic Card" procedure on page 2-273
"Physically Replace a Traffic Card" procedure on page 2-273
Double-click the source-node card with the terminal loopback.
Click the Maintenance > Loopback > Port tabs.
Select None from the Loopback Type column for the port being tested.
Select the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) in the Admin State column for
the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Chapter 1 General Troubleshooting
1-68.
for the suspected bad card
for the defective card.
November 2009