Automatic Vt Circuit Creation; Manual Vt Circuit Creation - Cisco ONS 15600 Reference Manual

Chapter 7 Circuits and Tunnels
Figure 7-14
ONS 15454

7.18.1 Automatic VT Circuit Creation

To route VT traffic across an ONS 15600 for compatible protection domains, you must create a VT
tunnels on an ONS 15454 node or create an end-to-end circuit. If you create an end-to-end circuit, CTC
automatically creates a tunnel to route the VT traffic. You can create circuits or tunnels with an
ONS 15600 as a hub node for the following domain combinations:
•
•
•
•
•
Once the tunnel or end-to-end circuit exists, additional VT circuits can be routed until all of the
bandwidth is used. The tunnel source and destination are the VT circuit source and destination, and when
created results in the creation of STS pass-through circuits on each node in the path. For any of the listed
topology combinations except Path Protection to Path Protection, one tunnel is required; a Path
Protection-to-Path Protection topology requires two tunnels.

7.18.2 Manual VT Circuit Creation

When you must route VT traffic from an ONS 15454 Path Protection across an ONS 15600 hub to a
line-protected domain, CTC cannot automatically create the end-to-end VT1.5 circuit. The configuration
requires three TL1-like circuits. You must create all three circuits separately:
1. VT1.5 open-ended circuit on the ONS 15454 Path Protection
2. STS open-ended circuit on the ONS 15600 hub node
3. VT1.5 two-way circuit on the ONS 15454 line-protected node
The three TL1-like circuits must physically align for CTC to automatically merge the circuits.
Figure 7-15
ONS 15454 line-protected domain.
ONS 15600 as Hub Node between Protection Domains
ONS 15454
ONS 15454
Path Protection to Path Protection
1+1 to 1+1
BLSR to BLSR
1+1 to BLSR
Unprotected to BLSR
is an example of an ONS 15600 node bridging an ONS 15454 Path Protection and an
ONS 15454
ONS 15600
BLSR
1+1
ONS 15454
ONS 15454
Cisco ONS 15600 Reference Manual, R8.0
7.18.1 Automatic VT Circuit Creation
ONS 15454
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