Cisco ONS 15327 User Documentation page 179

Chapter 5 SONET Topologies
Log into the node that will connect to the new node through its east port (Node 4 in the
Step 5
example).
Step 6 Switch protection on the east port:
a. Click the Maintenance > Ring tabs.
From the East Switch list, choose FORCE RING. Click Apply.
b.
Performing a FORCE switch generates a force switch request on an equipment (FORCE-REQ) alarm.
This is normal.
Caution
Log into the node that will connect to the new node through its west port (Node 1 in the
Step 7
example).
Switch protection on the west port:
Step 8
a. Click the Maintenance > Ring tabs.
From the West Switch list, choose FORCE RING. Click Apply.
b.
Following the diagram that you created in Step 1, remove the fiber connections from the two nodes that
Step 9
will connect directly to the new node.
Remove the east fiber from the node that will connect to the west port of the new node. In the
a.
Figure 5-11
Remove the west fiber from the node that will connect to the east port of the new node. In the
b.
Figure 5-11
Replace the removed fibers with fibers that are connected to the new node. Connect the west port to the
Step 10
east port and the east port to the west port.
the node is connected.
June 2002
Traffic is unprotected during a protection switch.
example, this is Node 4/Slot 2.
example, this is Node 1/Slot 1.
Figure 5-12 shows the BLSR in the
Cisco ONS 15327 User Documentation, R3.3
Bidirectional Line Switched Rings
Figure 5-11
Figure 5-11
Figure 5-11 example after
5-13