5-32
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Subtending Rings
Figure 5-26 A BLSR subtending from a BLSR
After subtending two BLSRs, you can route circuits from nodes in one ring to nodes in the second ring.
For example in
, you can route a circuit from Node 1 to Node 7. The circuit would normally
travel from Node 1 to Node 4 to Node 7. If fiber breaks occur, for example between Nodes 1 and 4 and
Nodes 4 and 7, traffic is rerouted around each ring: in this example, Nodes 2 and 3 in Ring 1 and Nodes
5 and 6 in Ring 2.
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 5-7
Step 1
In the node that will subtend the BLSR (Node 4 in
), install the OC-N cards that will serve
as the BLSR trunk cards (Node 4, Slots 3 and 4).
Step 2
Attach fibers from these cards to the BLSR trunk cards on the BLSR nodes. In
, Node 4/Slot
3 connects to Node 7/Slot 4, and Slot 4 connects to Node 5/Slot 3.
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
.
Node 5
Slot 3
West
East
Slot 4
Node 7
Slot 4
East
Slot 3
West
Slot 3
West
Slot 4
East
Node 6
Node 1
Slot 1
West
Slot 1
West
Slot 2
East
Slot 2
East
Node 3
Slot 2
East
Slot 1
West
Node 2
Slot 1
West
Slot 2
East
Slot 4
East
Slot 3
West
Node 4
BLSR
Ring 1
BLSR
Ring 2
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Summary of Contents for ONS 15327
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Page 30: ...Figures xxviii Cisco ONS 15327 User Documentation June 2002 ...
Page 44: ...Procedures xlii Cisco ONS 15454 Installation and Operations Guide R3 2 June 2002 ...
Page 540: ...Glossary GL 16 Cisco ONS 15327 User Documentation R3 3 June 2002 ...