Cisco Systems ONS 15600 manual In-Service Topology Upgrades

Chapter 8 SONET Topologies and Upgrades

8.5 In-Service Topology Upgrades

Figure 8-12	PPMN Virtual Ring
ONS 15454	ONS 15454	ONS 15454	ONS 15454
Node 5	Node 1	Node 4	Node 8

OC-12 OC-48 OC-12

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ONS 15454	ONS 15454	ONS 15454	ONS 15454
Node 6	Node 2	Node 3	Node 7

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.

Cisco ONS 15600 Reference Manual, R7.2

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