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Cisco ONS 15454 Installation and Operations Guide
78-13453-01
Chapter 5 SONET Topologies
Subtending Rings
Procedure: Subtend a BLSR from a BLSR
This procedure requires an established BLSR and one BLSR node with OC-N cards and fibers to carry
the BLSR. The procedure also assumes you know how to set up a BLSR. For BLSR setup procedures,
see the “Setting Up BLSRs” section on page 5-10.
Step 1 In the node that will subtend the BLSR (Node 4 in Figure 5-30), install the OC-N cards that will serve
as the BLSR trunk cards (Node 4, Slots 6 and 13).
Step 2 Attach fibers from these cards to the BLSR trunk cards on the BLSR nodes. In Figure 5-30, Node 4/Slot
6 connects to Node 7/Slot 13, and Slot 13 connects to Node 5/Slot 6.
Step 3 From the node view, click the Provisioning > Sonet DCC tabs.
Step 4 Click Create.
Step 5 In the Create SDCC Terminations dialog box, click the slot and port that will carry the BLSR.
Step 6 Click OK.
Step 7 The selected slots/ports are displayed in the SDCC Terminations section.
Step 8 Put the ports that you will use for the BLSR in service:
a. In the node view, double-click the BLSR trunk card.
b. Select the Provisioning > Line tabs. Under Status, choose In Service.
c. Click Apply.
d. Repeat steps a – c for the second BLSR trunk card.
Step 9 To configure the BLSR, use the “Provision the BLSR” procedure on page 5-14. The subtending BLSR
must have a ring ID that differs from the ring ID of the first BLSR.
Step 10 Follow Steps 1 – 8 for the other nodes that will be in the subtending BLSR.
Step 11 Display the network view to see the subtending ring.
Figure 5-31 shows an example of two subtending BLSRs.
Figure 5-31 Viewing subtending BLSRs on the network map
Figure 5-32 shows the Ring subtab for Node 5, which is the node that carries the two rings.