Ring Provisioning; Path Protection Topology - Cisco ONS 15454 Reference Manual

Chapter 2 Procedures and Provisioning

2.4 Ring Provisioning

This section provides information and sample procedures for setting up STS or VT circuits over existing
path protectionand bidirectional line switch ring (BLSR) configurations using TL1, including:
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Because the ONS 15454, ONS 15327, ONS 15310-CL and ONS 15600 implements logical path
Note
protection, there are no defined east and west ports. Instead, the east STS path for one circuit can exit a
different port than the east STS path of another circuit, even though the west STS paths for both circuits
might share the same port.
The ONS 15310-CL does not support BLSR.
Note

2.4.1 Path Protection Topology

No special configuration of the physical path protection topology is required other than connecting the
fibers to the nodes. The east and west paths must exit a node at different ports (to ensure link diversity),
but there are no other physical topology restrictions
ONS 15xxx networks give you the option to set up path-protected mesh networks (PPMNs). PPMNs
extend the protection scheme of a path protection from the basic ring configuration to the meshed
architecture of several interconnected rings. For more information about PPMN, refer to the Cisco
Procedure Guide applicable to your platform.
Path Protection topology
Path Protection cross-connections
Ring-to-ring interconnection
1-way drop and continue
Cisco ONS SONET TL1 Command Guide, R6.0
2.4 Ring Provisioning
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