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Cisco ONS SONET TL1 Command Guide, R6.0
Chapter 2 Procedures and Provisioning
2.4.2 Path Protection Cross-Connections
2.4.2 Path Protection Cross-Connections
To create a path protection cross-connection using TL1, you only need to designate whether it is a 1-way
or 2-way cross-connect, but the access identifier (AID) must be more explicit. For example, to create a
1-way path protection circuit over the network with nodes A, B, C, and D and segments A-B, B-D, A-C,
C-D as shown in Figure 2-28, enter the following commands (Node A is the source node and Node D is
the destination node):
ENT-CRS-STS1:A:FROM,TO1&TO2:CTAG1::1WAY;
ENT-CRS-STS1:B:FROM,TO:CTAG2::1WAY;
ENT-CRS-STS1:C:FROM,TO:CTAG3::1WAY;
ENT-CRS-STS1:D:FROM1&FROM2,TO:CTAG4::1WAY;
Figure 2-28 Network Configured With a 1-Way Path Protection Circuit
2.4.3 Ring-to-Ring Interconnection
In the following examples, the form “5/1/1” represents “Slot 5, Port 1, STS 1.” For VTs add the normal
VT Group and VT ID extensions. These examples also assume that the slots/ports have been
auto-provisioned (via a plug-in event) and that the ports involved have been placed into the in service
state using a port configuration command, for example, ED-OCN.
For the examples in this section, both rings traverse the same node; therefore, only a single
cross-connection is required to create the ring-to-ring connection. This is shown in Figure 2-29. The
node named “Cisco” is in the nexus.
ONS 15xxx
Node A
ONS 15xxx
Node B
ONS 15xxx
Node D
ONS 15xxx
Node C
51345
= Fiber 1
= Fiber 2
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