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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (IS; OOS,DSBLD; OOS,MT) from the Admin State column for the port
being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 6 Clear the facility loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 7 Complete the “1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports” procedure on
page 1-81.
1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports
In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate
whether the destination port is causing circuit trouble. In the example situation in Figure 1-34, the
terminal loopback is performed on an intermediate Ethernet port in the circuit. You first create a
bidirectional circuit that originates on the source-node Ethernet port and loops back on the
intermediate-node port. You then proceed with the terminal loopback test. If you successfully complete
a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.
Figure 1-34 Terminal Loopback on an Intermediate-Node Ethernet Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Terminal loopbacks require on-site personnel.
Complete the “Create a Terminal Loopback on Intermediate-Node Ethernet Ports” procedure on
page 1-82.
Destination
ONS Node
Ethernet EthernetXC
Source
ONS Node
Intermediate
ONS Node
Ethernet
Test Set
Ethernet XC Ethernet Ethernet XC
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