Cisco ONS 15454 Troubleshooting Manual page 134

1.5.8 Perform a Hairpin Test on a Destination-Node Ethernet Port
b.
c.
d.
e.
f.
Clear the terminal loopback circuit:
Step 6
a.
b.
c.
d.
Complete the
Step 7
page
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.
of a hairpin loopback on a destination-node port.
Figure 1-37 Hairpin on a Destination-Node Ethernet Port
Test Set
The ONS 15454 does not support simplex operation on the cross-connect card. Two cross-connect cards
Note
of the same type must be installed for each node.
Note Hairpin loopbacks require on-site personnel.
Complete the
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-90
Click the Maintenance > Loopback tabs.
Select None from the Loopback Type column for the port being tested.
Select the appropriate state (IS; OOS,DSBLD; OOS,MT) in the Admin State column for the port
being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
"1.5.8 Perform a Hairpin Test on a Destination-Node Ethernet Port" procedure on
1-90.
CE-MR-10
"Create the Hairpin Circuit on the Destination-Node Port" procedure on page
Destination
ONS Node
XC OC-N
Chapter 1 General Troubleshooting
Figure 1-37 shows an example
Source
ONS Node
OC-N XC CE-MR-10
1-91.
November 2009