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Cisco ONS 15454 SDH Procedure Guide, R7.0
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Chapter 6 Create Circuits and Low-Order Tunnels
NTP- D55 Create a Manually Routed Low-Order VC3 Circuit
Caution Circuits routed on MS-SPRing protection channels are not protected and are preempted during
MS-SPRing switches.
Step 14 If you selected Fully Protected Path in Step 13 and the circuit will be routed on an SNCP, choose a
Node-Diverse Path option:
• Nodal Diversity Required—Ensures that the primary and alternate paths within the SNCP ring
portions of the complete circuit path are nodally diverse.
• Nodal Diversity Desired— Specifies that node diversity is preferred, but if node diversity is not
possible, CTC creates fiber-diverse paths for the SNCP ring portion of the complete circuit path.
• Link Diversity Only—Specifies that only fiber-diverse primary and alternate paths for SNCP ring
portions of the complete circuit path are needed. The paths might be node diverse, but CTC does not
check for node diversity.
Step 15 If you selected Fully Protected Path in Step 13 and the circuit will be routed on an SNCP DRI, click the
Dual Ring Interconnect check box.
Step 16 Click Next. In the VC LO Matrix Optimization page, choose one of the following:
• Create VC LO tunnel on transit nodes—This option is available if the VC3 circuit passes through a
node that does not have a low-order tunnel, or if an existing low-order tunnel is full. Low-order
tunnels allow VC3 circuits to pass through ONS 15454 SDHs without consuming low-order
cross-connect card resources. Creating low-order tunnels is a good idea if you are creating many
low-order circuits from the same source and destination. Refer to the Cisco ONS 15454 SDH
Reference Manual for more information.
• Create VC LO aggregation point—This option is available if you are creating a VC3 circuit to an
STM-N port for handoff to non-ONS 15454 SDH networks or equipment, such as an IOF, switch, or
DACS. A LAP allows low-order circuits to be routed through a node using one VC4 connection on
the cross-connect card high-order matrix rather than multiple connections on the low-order matrix.
If you want to aggregate the low-order circuit you are creating with others onto an VC4 for transport
outside the ONS 15454 SDH network, choose one of the following:
–
VC4 grooming node is source-node, VC12 grooming node is destination-node—Creates the
LAP on the VC3 circuit source node. This option is available only if the VC3 circuit originates
on an STM-N card.
–
VC4 grooming node is destination-node, VC3 grooming node is source-node—Creates the LAP
on the VC3 circuit destination node. This option is available only if the VC3 circuit terminates
on an STM-N card.
• None—Choose this option if you do not want to create a low-order tunnel or a LAP. This is the only
available option if CTC cannot create a low-order tunnel or LAP.
Step 17 Click Next. In the Route Review and Edit area, node icons appear for you to route the circuit. The circuit
source node is selected. Green arrows pointing from the source node to other network nodes indicate
spans that are available for routing the circuit.
Step 18 Complete the “DLP-D96 Provision a Low-Order VC3 Circuit Route” task on page 17-94 for the VC3
circuit you are creating.
Step 19 Click Finish. CTC compares your manually provisioned circuit route with the specified path diversity
option you chose in Step 14. If the path does not meet the specified path diversity requirement, CTC
displays an error message and allows you to change the circuit path.
Step 20 If you entered more than 1 in the Number of Circuits field, the Circuit Creation dialog box appears so
you can create the remaining circuits. Repeat Steps 6 through 19 for each additional circuit.
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