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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.3 Troubleshooting an Ethernet Circuit Path With Loopbacks
Step 9
Clear the terminal 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.
The entire optical circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
1.3 Troubleshooting an Ethernet Circuit Path With Loopbacks
Facility loopbacks and terminal loopbacks 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.
You can use these procedures only on the ASAP card Ethernet ports in the ONS 15600 SDH system. The
example in this section tests an Ethernet circuit on a three-node MS-SP Ring. 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 Ethernet port
4.
A terminal loopback on the intermediate-node Ethernet 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.
1.3.1 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. In the testing
situation used in this example, the source is an ASAP Ethernet port in the source node. Completing a
successful facility loopback on this port isolates the port as a possible failure point.
shows
an example of a facility loopback on a circuit source Ethernet port.
Note
Facility loopbacks require on-site personnel.
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