In-Service Topology Upgrades - Cisco ONS 15600 Reference Manual

Chapter 8 SDH Topologies and Upgrades
Figure 8-20
ONS 15600 SDH
ONS 15454 SDH

8.8 In-Service Topology Upgrades

Topology upgrades can be performed while the network is 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:
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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 SDH circuit types supported for in-service topology upgrades are:
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You cannot upgrade stitched Ethernet circuits during topology conversions.
A database restore on all nodes in a topology returns converted circuits to their original topology.
Note
78-18400-01
Extended SNCP Virtual Ring
ONS 15454 SDH
Node 5 Node 1
STM-16
ONS 15600 SDH
Node 6 Node 2
Point-to-point or linear ADM to two-fiber MS-SPRing
Node addition or removal from an existing topology
Virtual containers (VC)
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)
ONS 15600 SDH
Node 4
STM-64 SNCP
ONS 15454 SDH
Node 3
Cisco ONS 15600 SDH Reference Manual, Release 9.0
8.8 In-Service Topology Upgrades
ONS 15454 SDH
Node 8
STM-16
ONS 15600 SDH
Node 7
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