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Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Path-Protected Mesh Networks
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.”
shows Nodes 1, 2, 3, and 4 in a standard OC-48 ring. Nodes 5, 6, 7, and 8 link to the
backbone ring through OC-12 fiber. The “virtual ring” formed by Nodes 5, 6, 7, and 8 uses both OC-48
and OC-12.
= Primary path
= Secondary path
Wo
rking tr
affic
Protect traffic
Source
Node
Destination
Node
32136
Node 1
Node 11
Node 2
Node 4
Node 5
Node 6
Node 7
Node 8
Node 10
Node 9
Node 3
Содержание ONS 15327
Страница 22: ...Contents xxii Cisco ONS 15327 User Documentation June 2002 I N D E X ...
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Страница 44: ...Procedures xlii Cisco ONS 15454 Installation and Operations Guide R3 2 June 2002 ...
Страница 82: ...1 32 Cisco ONS 15327 User Documentation R3 3 June 2002 Chapter 1 Hardware Installation Hardware Specifications ...
Страница 166: ...4 22 Cisco ONS 15327 User Documentation R3 3 June 2002 Chapter 4 IP Networking ONS 15327 Routing Table ...
Страница 254: ...7 22 Cisco ONS 15327 User Documentation R3 3 June 2002 Chapter 7 Card Provisioning Using Virtual Wires ...
Страница 408: ...13 26 Cisco ONS 15327 User Documentation R3 3 June 2002 Chapter 13 Card Reference E10 100 4 Card ...
Страница 540: ...Glossary GL 16 Cisco ONS 15327 User Documentation R3 3 June 2002 ...