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Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 6 Create Circuits and Low-Order Tunnels
NTP- D54 Create an Automatically Routed Low-Order VC3 Circuit
Step 10 Click Next.
Step 11 Complete the “DLP-D318 Provision a Low-Order VC3 Circuit Source and Destination” task on
page 20-9.
Step 12 In the Circuit Routing Preferences area (Figure 6-2 on page 6-10), choose Route Automatically. Two
options are available; choose either, both, or none based on your preferences.
• Using Required Nodes/Spans—Check this check box if you want to specify nodes and spans to
include or exclude in the CTC-generated circuit route.
Including nodes and spans for a circuit ensures that those nodes and spans are in the working path
of the circuit (but not the protect path). Excluding nodes and spans ensures that the nodes and spans
are not in the working or protect path of the circuit.
• Review Route Before Creation—Check this check box if you want to review and edit the circuit
route before the circuit is created.
Step 13 Set the circuit path protection:
• To route the circuit on a protected path, leave Fully Protected Path checked and continue with
Step 14. CTC creates a fully protected circuit route based on the path diversity option you choose.
Fully protected paths might or might not have SNCP path segments (with primary and alternate
paths), and the path diversity options apply only to SNCP path segments, if any exist.
• To create an unprotected circuit, uncheck Fully Protected Path and continue with Step 16.
• To route the circuit on an MS-SPRing protection channel, if available, uncheck Fully Protected
Path, check Protection Channel Access, click Ye s in the Warning dialog box, and then continue
with Step 16.
Caution Circuits routed on MS-SPRing protection channels are not protected. They 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 one of
the following:
• Nodal Diversity Required—Ensures that the primary and alternate paths within 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 If you selected Using Required Nodes/Spans in Step 12, complete the following substeps. If not,
continue with Step 18.
a. Click Next.
b. In the Circuit Route Constraints For Auto Routing area, click a node or span on the circuit map.
c. Click Include to include the node or span in the circuit. Click Exclude to exclude the node or span
from the circuit. The order in which you choose included nodes and spans is the order in which the
circuit is routed. Click spans twice to change the circuit direction.
d. Repeat Step c for each node or span that you wish to include or exclude.
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