Cisco ONS 15454 Series Procedure Manual page 181

Chapter 6 Create Circuits and VT Tunnels
Circuits routed on BLSR protection channels are not protected and are preempted during BLSR
Caution
switches.
Step 13 If you selected Fully Protected Path in
a Node-Diverse Path option:
• Nodal Diversity Required—Ensures that the primary and alternate paths within the path protection
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 path protection portion of the complete circuit path.
Link Diversity Only—Specifies that only fiber-diverse primary and alternate paths for path
•
protection portions of the complete circuit path are needed. The paths might be node-diverse, but
CTC does not check for node diversity.
If you selected Fully Protected Path in
Step 14
check the Dual Ring Interconnect check box.
Click Next. In the Create area of the VT Matrix Optimization panel, choose one of the following:
Step 15
Create VT tunnel on transit nodes—This option is available if the DS-1 circuit passes through a node
•
that does not have a VT tunnel, or if an existing VT tunnel is full. VT tunnels allow VT circuits to
pass through ONS 15454s without consuming cross-connect card resources. VT tunnels can carry
28 VT1.5 circuits. In general, creating VT tunnels is a good idea if you are creating many VT
circuits from the same source and destination. Refer to the Cisco ONS 15454 Reference Manual for
more information.
Create VT aggregation point—This option is available if the DS-1 circuit source or destination is on
•
an EC1, DS3, DS3E, DS3i-N-12, DS3XM-6, DS3XM-12, or OC-N port on a BLSR, 1+1, or
unprotected node. VAPs collect DS-1s on an STS for handoff to non-ONS 15454 networks or
equipment, such as an IOF, switch, or digital access and cross-connect system (DACS). It allows
VT1.5 circuits to be routed through the node using one STS connection on the cross-connect card
matrix rather than multiple VT connections on the cross-connect card VT matrix. If you want to
aggregate the DS-1 circuit you are creating with others onto an STS for transport outside the
ONS 15454 network, choose one of the following:
–
–
• None—Choose this option if you do not want to create a VT tunnel or a VAP. This is the only
available option if CTC cannot create a VT tunnel or VAP.
Click Next. In the Route Review and Edit area, node icons appear for you to route the circuit. The circuit
Step 16
source node is selected. Green arrows pointing from the source node to other network nodes indicate
spans that are available for routing the circuit.
Complete the
Step 17
circuit you are creating.
Click Finish. CTC compares your manually provisioned circuit route with the specified path diversity
Step 18
option you chose in
displays an error message and allows you to change the circuit path.
August 2005
STS grooming node is [source node], VT grooming node is [destination node]—Creates the
VAP on the DS-1 circuit source node. This option is available only if the DS-1 circuit originates
on an EC1, DS3, DS3E, DS3i-N-12, DS3XM-6, DS3XM-12, or OC-N card.
STS grooming node is [destination node], VT grooming node is [source node]—Creates the
VAP on the DS-1 circuit destination node. This option is available only if the DS-1 circuit
terminates on an EC1, DS3, DS3E, DS3i-N-12, DS3XM-6, DS3XM-12, or OC-N card.
"DLP-A96 Provision a DS-1 or DS-3 Circuit Route" task on page 17-97
Step 13. If the path does not meet the specified path diversity requirement, CTC
NTP-A182 Create a Manually Routed DS-1 Circuit
Step 12 and the circuit will be routed on a path protection, choose
Step 12 and the circuit will be routed on a path protection DRI,
Cisco ONS 15454 Procedure Guide, R5.0
for the DS-1
6-13