Open-Ended Path Protection Circuits - Cisco ONS 15454 Reference Manual

11.9 11.9.1 Open-Ended Path Protection Circuits

Figure 11-7
11.9.1 Open-Ended Path Protection Circuits
If ONS 15454s are connected to a third-party network, you can create an open-ended path protection
circuit to route a circuit through it. To do this, you create four circuits. One circuit is created on the
source ONS 15454 network. This circuit has one source and two destinations, each destination
provisioned to the ONS 15454 interface that is connected to the third-party network. The second and
third circuits are created on the third-party network so that the circuit travels across the network on two
diverse paths to the far end ONS 15454. At the destination node, the fourth circuit is created with two
sources, one at each node interface connected to the third-party network. A selector at the destination
node chooses between the two signals that arrive at the node, similar to a regular path protection circuit.
11.9.2 Go-and-Return Path Protection Routing
The go-and-return path protection routing option allows you to route the path protection working path
on one fiber pair and the protect path on a separate fiber pair
be the shortest path. If a fault occurs, both the working and protection fibers are not affected. This feature
only applies to bidirectional path protection circuits. The go-and-return option appears in the Circuit
Attributes panel of the Circuit Creation wizard.
Cisco ONS 15454 Reference Manual, R7.0.1
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Editing Path Protection Selectors
Chapter 11
(Figure 11-8). The working path will always
Circuits and Tunnels
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