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Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 6 Create Circuits and Low-Order Tunnels
NTP- D335 Create a Manually Routed Low-Order VC11 Circuit
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. 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 17.
• 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 17.
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 VC11 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 VC11 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 VC11 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 a VC4 for transport
outside the ONS 15454 SDH network, choose one of the following:
–
VC4 grooming node is source-node, VC11 grooming node is destination-node—Creates the
LAP on the VC11 circuit source node. This option is available only if the VC11 circuit
originates on an STM-N card.
–
VC4 grooming node is destination-node, VC11 grooming node is source-node—Creates the
LAP on the VC11 circuit destination node. This option is available only if the VC11 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.
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