Cisco ONS 15454 SDH Specifications download pdf (Page 248)

5-58

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 5 SDH Topologies

Extended SNCP 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 5

(STM-16) 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 13.

Step 17 Start CTC for the node on the opposite end (Node 3 in Figure 5-41) and repeat Steps 13 – 16.

Step 18 For circuits running on an MS-SPRing protect VC4 (VC4 3 – 4 for an STM-4 MS-SPRing, VC4s 9 – 16

for an STM-16 MS-SPRing, and VC4s 33-64 for an STM-64), delete and recreate the circuit:

a. Delete the first circuit by clicking the Circuits tab, choose the circuit, click Delete, and click Yes

when prompted.

b. Recreate the circuit on VC4s 3 – 4 (for an STM-4 MS-SPRing), VC4s 9 – 16 (for an STM-16

MS-SPRing), or VC4s 33-64 (for an STM-64 MS-SPRing) 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 VC4s. See “Creating Multiple Drops for Unidirectional Circuits” section on page 6-14

for more information.

c. Repeat Steps (a) and (b) for each circuit residing on an MS-SPRing protect VC4.

Note Deleting circuits is traffic affecting.

Step 19 Follow all procedures in the “Setting Up MS-SPRings” section on page 5-25 to configure the

MS-SPRing. The ring should have an East/West logical connection. While it may not physically be

possible to connect the STM-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 MS-SPRing. Do not accept

the MS-SPRing ring map until all nodes are provisioned.

Note E-W Mismatch alarms will occur until all nodes are provisioned.

Step 20 Display the network view to verify the newly-created ring.

5.11 Extended SNCP Mesh Networks

In addition to single MS-SPRings, SNCP rings, and ADMs, you can extend ONS 15454 SDH traffic

protection by creating extended SNCP mesh networks. Extended SNCPs include multiple ONS 15454

SDH topologies and extend the protection provided by a single SNCP ring to the meshed architecture of

several interconnecting rings.

In an extended SNCP, circuits travel diverse paths through a network of single or multiple meshed rings.

When you create circuits, you can provision CTC to automatically route circuits across the extended

SNCP, 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.

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