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Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Path-Protected Mesh Networks
Step 14
In the SDCC Terminations section, click
Create
.
Step 15
Highlight the slot that is not already in the SDCC Terminations list (in this example, Port 1 of Slot 1
(OC-48) on Node 1.
Step 16
Click
OK
. (An EOC SDCC alarm will occur until the DCC is created on the other node; in the example,
Node 3/Slot 4.
Step 17
Display the node on the opposite end (Node 3 in
) and repeat Steps 13 – 16.
Step 18
For circuits running on a BLSR protect STS (STSs 7 – 12 for an OC-12 BLSR, STSs 25 – 48 for an
OC-48 BLSR), delete and recreate the circuit:
a.
Delete the first circuit.
b.
Recreate the circuit on STSs 1 – 6 (for an OC-12 BLSR) or 1 – 24 (for an OC-48 BLSR) on the fiber
that served as the protect fiber in the linear ADM. During circuit creation, deselect “Route
Automatically” and “Fully Protected Path” on the Circuit Creation dialog box so you can manually
route the circuit on the appropriate STSs. See the
“Create a Unidirectional Circuit with Multiple
for more information.
c.
Repeat Steps (a) and (b) for each circuit residing on a BLSR protect STS.
Note
Deleting circuits is traffic affecting.
Step 19
Follow all procedures in the
“Setting Up BLSRs” section on page 5-7
to configure the BLSR. The ring
should have an East/West logical connection. While it may not physically be possible to connect the
OC-N cards in an East/West pattern, it is strongly recommended. If the network ring that is already
passing traffic does not provide the opportunity to connect fiber in this manner, logical provisioning can
be performed to satisfy this requirement.
Be sure to assign the same Ring ID and different node IDs to all nodes in the BLSR. Do not accept the
BLSR ring map until all nodes are provisioned.
Note
E-W Mismatch alarms will occur until all nodes are provisioned.
Step 20
Display the network map to view the newly-created ring.
5.6 Path-Protected Mesh Networks
In addition to single BLSRs, UPSRs and ADMs, you can extend ONS 15327 traffic protection by
creating path-protected mesh networks (PPMNs). PPMNs include multiple ONS 15327 SONET
topologies and extend the protection provided by a single UPSR to the meshed architecture of several
interconnecting rings. In a PPMN, circuits travel diverse paths through a network of single or multiple
meshed rings. When you create circuits, you can have CTC automatically route circuits across the
PPMN, or you can manually route them. You can also choose levels of circuit protection. For example,
if you choose full protection, CTC creates an alternate route for the circuit in addition to the main route.
The second route follows a unique path through the network between the source and destination and sets
up a second set of cross-connections.
For example, in
, a circuit is created from Node 3 to Node 9. CTC determines that the shortest
route between the two nodes passes through Node 8 and Node 7, shown by the dotted line, and
automatically creates cross-connections at Nodes, 3, 8, 7, and 9 to provide the primary circuit path.
Summary of Contents for ONS 15327
Page 22: ...Contents xxii Cisco ONS 15327 User Documentation June 2002 I N D E X ...
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 ...
