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Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 14 Add and Remove Nodes
NTP- D213 Remove an MS-SPRing Node
Figure 14-3 Four-Node, Two-Fiber MS-SPRing Before a Node Is Removed
Step 6
Complete the “DLP-D298 Check the Network for Alarms and Conditions” task on page 19-83 to verify
that the MS-SPRing is free of major alarms or problems. If trouble is indicated (for example, if a major
alarm exists), resolve the problem before proceeding. See Chapter 9, “Manage Alarms” or, if necessary,
refer to the Cisco ONS 15454 SDH Troubleshooting Guide.
Step 7 From the View menu, choose Go to Other Node. Choose the node that you will remove and click OK.
Step 8 Click the Circuits tab. If the Scope setting is set to Network, choose Node from the Scope drop-down
list. Make sure that the Filter button is off (not indented) to ensure that all circuits are visible.
Step 9 Delete all circuits that originate or terminate on the node. See the “DLP-D27 Delete Circuits” task on
page 17-21.
Step 10 Complete the “DLP-D357 Verify Pass-Through Circuits” task on page 20-64 to verify that circuits
passing through the node to be deleted enter and exit the node on the same VC4 and/or VC3, VC11, or
VC12.
Step 11 From the View menu, choose Go to Network View.
Step 12 Referring to the diagram created in Step 4, complete the “DLP-D303 Initiate an MS-SPRing Force Ring
Switch” task on page 20-3 at each node that connects to the target (removal) node to force traffic away
from it. You must perform a Force switch at each port connected to the target node. For example, in
Figure 14-3, you would perform a Force switch on the east port of Node 3 and the west port of Node 1.
Step 13 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 alarms appear, investigate and resolve
them before continuing. Refer to the Cisco ONS 15454 Troubleshooting Guide for procedures.
Step 14 Remove the fiber connections between the node being removed and the two neighboring nodes.
78791
West East
West East
West East
West East
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 4 (to be removed)
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 2Node 1
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 3
Slot 5
Tx
Rx
Slot 12
Tx
Rx
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