Cisco ONS 15454 SDH Procedure Manual page 197

Chapter 6 Create Circuits and Low-Order Tunnels
Click Include to include the node or span in the circuit. Click Exclude to exclude the node or span
c.
from the circuit. The order in which you choose included nodes and spans is the order in which the
circuit will be routed. Click spans twice to change the circuit direction.
Repeat Step c for each node or span that you wish to include or exclude.
d.
e. Review the circuit route. To change the circuit routing order, choose a node from the Required
Nodes/Lines or Excluded Nodes Links lists and click the Up or Down buttons to change the circuit
routing order. Click Remove to remove a node or span.
Click Next. In the VC LO Matrix Optimization page, choose one of the following:
Step 17
Create VC LO tunnel on transit nodes—This option is available if the VC12 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 VC12 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 VC12 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 network, choose one of the following:
–
–
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.
If you selected Review Route Before Creation in
Step 18
continue with
Click Next.
a.
Review the circuit route. To add or delete a circuit span, choose a node on the circuit route. Blue
b.
arrows show the circuit route. Green arrows indicate spans that you can add. Click a span arrowhead,
then click Include to include the span or Remove to remove the span.
c. If the provisioned circuit does not reflect the routing and configuration you want, click Back to
verify and change circuit information. If the circuit needs to be routed to a different path, see the
"NTP-D82 Create a Manually Routed Low-Order VC12 Circuit" procedure on page
Click Finish. One of the following results occurs, depending on the circuit properties you chose in the
Step 19
Circuit Creation dialog box:
If you entered more than 1 in the Number of Circuits field and selected Auto-ranged, CTC
•
automatically creates the number of circuits entered in the Number of Circuits field. If auto-ranging
cannot complete all the circuits, for example, because sequential ports are unavailable at the source
or destination, a dialog box appears. Set the new source or destination for the remaining circuits,
then click Finish to continue auto-ranging. After completing the circuits, the Circuits window
appears.
78-17194-01
VC4 grooming node is source-node, VC12 grooming node is destination-node—Creates the
LAP on the VC12 circuit source node. This option is available only if the VC12 circuit
originates on an STM-N card.
VC4 grooming node is destination-node, VC12 grooming node is source-node—Creates the
LAP on the VC12 circuit destination node. This option is available only if the VC12 circuit
terminates on an STM-N card.
Step 19.
NTP- D81 Create an Automatically Routed Low-Order VC12 Circuit
Step 12, complete the following substeps. If not,
Cisco ONS 15454 SDH Procedure Guide, R7.0
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