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Bidirectional Line Switched Rings
Figure 5-18 A four-node BLSR after the trunk cards are switched at one node
Slot 6 (West)
Node 1
Slot 5 (West)
Node 4
Procedure: Move a BLSR Trunk Card
Use the following steps to move one BLSR trunk card to a different slot. Use this procedure for each
card you want to move. Although the procedure is for OC-48 BLSR trunk cards, you can use the same
procedure for OC-12, OC-48AS, and OC-192 cards.
Note
The ONS 15454 nodes must have CTC Release 2.0 or later and cannot have active alarms for the
OC-48 or OC-12 cards or the BLSR configuration.
Step 1
Log into CTC and display the BLSR nodes in network view. Verify the following:
•
•
•
If trouble is indicated, for example, a critical or major alarm exists, resolve the problem before
proceeding. Refer to the Cisco ONS 15454 Troubleshooting and Maintenance Guide for alarm
troubleshooting procedures.
Step 2
Switch traffic away from the node where the trunk card will be switched:
a.
b.
Cisco ONS 15454 Installation and Operations Guide
5-24
Slot 12 (East)
Slot 6 (East)
All BLSR spans on the network map are green.
On the Alarms tab, no critical or major alarms are present, nor any facility alarms, such as LOS,
LOF, AIS-L, SF, and SD. In a BLSR, these facility conditions may be reported as minor alarms.
On the Conditions tab, no ring switches are active.
Log into the node that is connected through its east port to the node where the trunk card will be
moved. (In the
Figure 5-17
From the East Switch list, choose FORCE RING. Click Apply.
Slot 6 (West)
Slot 6 (West)
Unchanged fiber route
Changed fiber route
example, this is Node 1.) Click the Maintenance > Ring tabs.
Chapter 5
SONET Topologies
Slot 12 (East)
Node 2
Slot 12 (East)
Node 3
78-13453-01
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