Cisco 15310-MA Guide de dépannage télécharger pdf (Page 67)

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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 1 General Troubleshooting

Troubleshooting Ethernet Circuit Paths With Loopbacks

1.6 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.

When performing this testing on networks that contain intermediate nodes, you will test the OC-N

connection at intermediate nodes rather than CE100T-8 card connections. (The CE100T-8 is a mapper

card and is only capable of supporting point-to-point circuits.)

You can use these procedures on CE100T-8 cards but not on ML-100T-8 Ethernet cards. Using a series

of facility loopbacks and terminal loopbacks, the example scenario traces the circuit path, tests the

possible failure points, and eliminates them. The logical progression contains six network test

procedures:

Note The test sequence for your circuits will differ according to the type of circuit and network topology.

1. A facility loopback on the source-node Ethernet port

2. A terminal loopback on the source-node Ethernet port

3. A facility loopback on the intermediate-node OC-N port

4. A terminal loopback on the intermediate-node OC-N port

5. A facility loopback on the destination-node Ethernet port

6. A terminal loopback on the destination-node Ethernet port

Note Facility and terminal loopback tests require on-site personnel.

1.6.1 Perform a Facility Loopback on a Source-Node Ethernet Port

The facility loopback test is performed on the node source port in the network circuit. Completing a

successful facility loopback on this port isolates the port as a possible failure point.

Note Facility loopbacks require on-site personnel.

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the “Create the Facility Loopback on the Source-Node Ethernet Port” procedure on page 1-31.

Create the Facility Loopback on the Source-Node Ethernet Port

Step 1 Connect a test set to the port you are testing.

Note For specific procedures to connect, set up, and use the test set equipment, consult the

manufacturer.

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Cisco 15310-MA Guide de dépannage Page 67