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Cisco ONS 15600 Reference Manual, R7.2
Chapter 8 SONET Topologies and Upgrades
8.5 In-Service Topology Upgrades
Figure 8-12 PPMN Virtual Ring
8.5 In-Service Topology Upgrades
Topology upgrades can be performed in-service to convert a live network to a different topology. An
in-service topology upgrade is potentially service-affecting, and generally allows a traffic hit of 50 ms
or less. Traffic might not be protected during the upgrade. The following in-service topology upgrades
are supported:
•
Point-to-point or linear ADM to two-fiber BLSR
•
Two-fiber BLSR to four-fiber BLSR
•
Node addition or removal from an existing topology
You can perform in-service topology upgrades irrespective of the service state of the involved
cross-connects or circuits, however all circuits must have a DISCOVERED status.
ONS 15600 circuit types supported for in-service topology upgrades are:
•
Synchronous transport signal (STS)
•
Unidirectional and bidirectional
•
Automatically routed and manually routed
•
CTC-created and TL1-created
•
Ethernet (unstitched)
•
Multiple source and destination (both sources should be on one node and both drops on one node)
You cannot upgrade stitched Ethernet circuits during topology conversions. For in-service topology
upgrade procedures, refer to the “Convert Network Configurations” chapter in the Cisco ONS 15600
Procedure Guide. For procedures to add or remove a node, refer to the “Add and Remove Nodes”
chapter of the Cisco ONS 15600 Procedure Guide.
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