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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
NTP-D213 Remove an MS-SPRing Node
Caution The following procedure minimizes traffic outages during node removals. You will delete all circuits that
originate and terminate on the node that will be removed. You will also verify that they do not enter and
exit the node on different VC4s and/or VC3s, VC11s, or VC12s. If they do, you will delete and recreate
the circuits, and traffic will be lost during this time.
Caution If you remove a node that is the only building integrated timing supply (BITS) timing source for the ring,
you also remove the only source of synchronization for all the nodes in that ring. Circuits that leave the
ring to connect to other networks synchronized to a Stratum 1 clock will experience a high level of
pointer adjustments, which might adversely affect traffic performance.
Step 1 According to local site practice, complete the “NTP-D108 Back Up the Database” procedure on
page 15-5 for all the nodes in the ring.
Step 2 Complete the “DLP-D195 Verify Timing in a Reduced Ring” task on page 18-82.
Step 3 Complete the “DLP-D60 Log into CTC” task on page 17-49 at the node you will remove. If you are
already logged in, continue with Step 2.
Step 4 Create a diagram of the MS-SPRing where you will remove the node. You can draw the MS-SPRing
manually, or you can print it from CTC by performing the following steps:
a. From the View menu, choose Go to Network View.
b. Click the Provisioning > MS-SPRing tabs.
c. Choose the desired MS-SPRing, then click Edit.
d. In the MS-SPRing window, verify that all the port information is visible. If not, press Ctrl and drag
the node icons to a new location so the information can be viewed.
e. Complete the “DLP-D146 Print CTC Data” task on page 18-37.
f. Close the MS-SPRing window by choosing Close from the File menu.
Step 5 Referring to the MS-SPRing diagram, identify the following:
• The node that is connected through its west port to the target (removal) node. For example, if you
were removing Node 4 in Figure 14-3, Node 1 is connected through its west port to Node 4.
• The node that is connected through its east port to the node that will be removed. In Figure 14-3,
Node 3 is connected through its east port to Node 4.
Write down the slot and port of the MS-SPRing in the node.
Purpose This procedure removes a node from an MS-SPRing.
Tools/Equipment None
Prerequisite Procedures NTP-D41 Create the MS-SPRing, page 5-13
Required/As Needed As needed
Onsite/Remote Onsite
Security Level Provisioning or higher
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