1-90
Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.5.8 Perform a Hairpin Test on a Destination-Node Ethernet Port
b. Click the Maintenance > Loopback tabs.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (IS; OOS,DSBLD; OOS,MT) in the Admin State column for the port
being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 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.
Step 7 Complete the “1.5.8 Perform a Hairpin Test on a Destination-Node Ethernet Port” procedure on
page 1-90.
1.5.8 Perform a Hairpin Test on a Destination-Node Ethernet Port
The hairpin test is performed on the cross-connect card in the network circuit. A hairpin circuit uses the
same port as source as well as destination. Completing a successful hairpin through the card isolates the
possibility that the cross-connect card is the cause of the faulty circuit. Figure 1-37 shows an example
of a hairpin loopback on a destination-node port.
Figure 1-37 Hairpin on a Destination-Node Ethernet Port
Note The ONS 15454 does not support simplex operation on the cross-connect card. Two cross-connect cards
of the same type must be installed for each node.
Note Hairpin loopbacks require on-site personnel.
Complete the “Create the Hairpin Circuit on the Destination-Node Port” procedure on page 1-91.
Destination
ONS Node
Source
ONS Node
159522
OC-N CE-MR-10XCOC-N
Test Set
XCCE-MR-10
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