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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.5.1 Perform a Facility Loopback on a Source-Node Ethernet Port
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:
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 hairpin on the source-node Ethernet port
4. A facility loopback on the intermediate-node Ethernet port
5. A terminal loopback on the intermediate-node Ethernet port
6. A facility loopback on the destination-node Ethernet port
7. A terminal loopback on the destination-node Ethernet port
8. A hairpin on the destination-node Ethernet port
Note Facility and terminal loopback tests require on-site personnel.
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. Figure 1-21 shows an
example of a facility loopback on a circuit source Ethernet port.
Note Facility loopbacks are not available for Release 4.1 or earlier G-Series cards.
Note Facility loopbacks require on-site personnel.
Figure 1-30 Facility Loopback on a Circuit Source Ethernet Port
Destination
ONS Node
XC
Source
ONS Node
Intermediate
ONS Node
Test Set
Ethernet EthernetEthernet Ethernet Ethernet Ethernet
XCXC
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