Figure 5-35 A Path-Protected Mesh Network - Cisco ONS 15327 User Documentation

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SONET Topologies

If full protection is selected, CTC creates a second unique route between Nodes 3 and 9 which, in this

example, passes through Nodes 2, 1, and 11. Cross-connections are automatically created at Nodes, 3,

2, 1, 11, and 9, shown by the dashed line. If a failure occurs on the primary path, traffic switches to the

second circuit path. In this example, Node 9 switches from the traffic coming in from Node 7 to the

traffic coming in from Node 11 and service resumes. The switch occurs within 50 ms.

Figure 5-35 A path-protected mesh network

PPMN also allows spans of different SONET line rates to be mixed together in "virtual rings."

backbone ring through OC-12 fiber. The "virtual ring" formed by Nodes 5, 6, 7, and 8 uses both OC-48

Protect traffic

shows Nodes 1, 2, 3, and 4 in a standard OC-48 ring. Nodes 5, 6, 7, and 8 link to the

Cisco ONS 15327 User Documentation, R3.3

Path-Protected Mesh Networks

= Primary path

= Secondary path