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Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 17 DLPs D1 to D99
DLP- D93 Four-Fiber MS-SPRing Span Switching Test
Step 3 Click Edit. An MS-SPRing window appears containing a graphic of the MS-SPRing.
Note If the node icons are stacked on the MS-SPRing graphic, press Ctrl while you drag and drop
each one to a new location so you can see the MS-SPRing port information clearly.
Step 4 Initiate a switch on the west span:
a. Right-click the west port of the four-fiber MS-SPRing node that you want to exercise and choose
Set West Protection Operation.
Note For four-fiber MS-SPRings, the squares on the network map represent ports. Right-click a
working port.
b. In the Set West Protection Operation dialog box, choose FORCE SPAN from the drop-down list.
Click OK.
c. Click Yes in the two Confirm MS-SPRing Operation dialog boxes that appear.
On the network view graphic, an F appears on the MS-SPRing channel where you invoked the
protection switch. The MS-SPRing span lines turn purple where the Force was invoked, and all span
lines between other MS-SPRing nodes turn green.
Step 5 Click the Conditions tab.
a. Click Retrieve.
b. Verify that a SPAN-SW-WEST (Span Switch West) condition is reported on the node where you
invoked the Force switch, and a SPAN-SW-EAST (Span Switch East) condition is reported on the
node connected to the west line of the node where you performed the switch. Make sure the Filter
button in the lower right corner of window is off.
Step 6 Click the Alarms tab.
a. Verify that the alarm filter is not on. See the “DLP-D227 Disable Alarm Filtering” task on
page 19-25 as necessary.
b. Verify that no unexplained alarms appear on the network. If unexplained alarms appear, resolve
them before continuing. Refer to the Cisco ONS 15454 SDH Troubleshooting Guide if necessary.
Step 7 Display the MS-SPRing window where you invoked the Force Span switch (the window might be hidden
by the CTC window).
Step 8 Clear the west switch:
a. Right-click the west port of the MS-SPRing node where you invoked the Force Span switch and
choose Set West Protection Operation.
b. In the Set West Protection Operation dialog box, choose CLEAR from the drop-down list. Click
OK.
c. Click Yes in the Confirm MS-SPRing Operation dialog box.
On the network view graphic, the Force Span switch is removed, the F disappears, and the span lines
between MS-SPRing nodes will be purple and green. The span lines might take a few moments to
change color.
Step 9 Initiate a switch on the east span:
a. Right-click the east port of MS-SPRing node and choose Set East Protection Operation.
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