Cisco ONS 15327, User Documentation

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5-11
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Bidirectional Line Switched Rings
•
All E-W MISMATCH, RING MISMATCH, APSCIMP, DFLTK, and BLSROSYNC alarms are
cleared.
Step 11 Test the BLSR using testing procedures normal for your site. Here are a few steps you can use:
a.
Run test traffic through the ring.
b.
Log into a node, click the Maintenance > Ring tabs, and choose MANUAL RING from the East
Switch list. Click Apply .
c.
In network view, click the Conditions tab and click Retrieve . You should see a Ring Switch West
event, and the far-end node that responded to this request will report a Ring Switch East event.
d. Verify that traffic switches normally.
e.
Choose Clear from the East Switch list and click Apply .
f. Repeat Steps a – d for the West Switch.
g.
Disconnect the fibers at one node and verify that traffic switches normally.
5.2.5 Adding and Removing BLSR Nodes
This section explains how to add and remove BLSR nodes. To add or remove a node, you force a
protection switch to route traffic away from the span where you will add or remove the node.
Figure 5-11
shows a three-node BLSR before the new node is added. To add Node 3, you would:
•
Force a protection switch on the Node 1 (Slot 1, West) and Node 4 (Slot 2, East) span. The protection
switch forces traffic away from the fibers that you will remove and reconnect to the added node.
• Provision the node for the BLSR (SDCC, timing, enable the ports)
•
Remove fibers from Node 1/Slot 1 and Node 4/Slot 2, then, using additional fibers, connect Node 1
and Node 4 to Node 3.
• Remove the protection switch to route traffic through the added node.
Note You can only add one node at a time to an ONS 15327 BLSR.