Cisco ONS 15454 Troubleshooting Manual page 113

Chapter 1 General Troubleshooting
You can use these procedures on G-Series and CE-Series Ethernet cards but not on E-Series or
ML-Series Ethernet cards. The example in this section tests a G-Series or CE-Series card circuit on a
three-node BLSR. 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:
The test sequence for your circuits will differ according to the type of circuit and network topology.
Note
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Facility and terminal loopback tests require on-site personnel.
Note
1.5.1 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 G-Series port in the source node. Completing a successful
facility loopback on this port isolates the G-Series port as a possible failure point.
example of a facility loopback on a circuit source Ethernet port.
Facility loopbacks are not available for Release 4.1 or earlier G-Series cards.
Note
Facility loopbacks require on-site personnel.
Note
Figure 1-30 Facility Loopback on a Circuit Source Ethernet Port
Source
ONS Node
Ethernet
Test Set
November 2009
A facility loopback on the source-node Ethernet port
A terminal loopback on the source-node Ethernet port
A hairpin on the source-node Ethernet port
A facility loopback on the intermediate-node Ethernet port
A terminal loopback on the intermediate-node Ethernet port
A facility loopback on the destination-node Ethernet port
A terminal loopback on the destination-node Ethernet port
A hairpin on the destination-node Ethernet port
XC
Ethernet
1.5.1 Perform a Facility Loopback on a Source-Node Ethernet Port
Intermediate
ONS Node
XC
Ethernet Ethernet
Cisco ONS 15454 Troubleshooting Guide, R8.5
Figure 1-21 shows an
Destination
ONS Node
XC
Ethernet Ethernet
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