26.1.2 Migrating in phases
For some organizations, their system might function better if phased migration is used rather than building an entirely new system. For such organizations, it will be necessary to completely replicate the existing NNM system to a new NNMi system, thus replacing the old system. Although many migration methods are available, we recommend the following phases:
26.2 Phase 1: Migrating the SNMP information
Configure NNMi using the SNMP information of the environment currently being used.
26.3 Phase 2: Migrating discovery
Configure NNMi to discover objects in a manner similar to the way discovery worked under NNM (automatically).
26.4 Phase 3: Migrating status monitoring
Configure a state polling interval and protocol most appropriate to the environment being used.
26.5 Phase 4: Migrating event configuration and event reduction
Configure NNMi to display event severity, category, and messages and to run automatic actions as NNM was configured to. You might also need to configure deduplication, rate counting, and pairwise cancellation.
Phase 5: Migrating graphical visualization
Migrate the hierarchical structures of the NNM location map, Internet submap, and segment submap as NNMi node group configurations. For details about the migration method, see the Release Notes.
Table 26‒1: Migration range provides an overview of the simplest method and the most detailed and thorough method with respect to the migration range.
With the simplest method, you import the information unique to your NNM environment and use the NNMi default values for other configurations, which have been improved from NNM.
With the most detailed and thorough method, carefully check the NNM configurations and replicate them to NNMi.
The remainder of this chapter explains one by one the processes of migrating an NNM configuration to NNMi. The following headings, such as Collect from NNM and Replicate to NNMi, indicate where in the migration process that portion of the procedure is applied.
Collect from NNM indicates a task that is performed at the NNM management station.
Replicate to NNMi indicates a task that is performed at the NNMi management station.
NNMi enhancement indicates an additional task that is performed at the NNMi management station. You can make enhancements at any time, either during or after migration.
At some points, multiple methods are provided, depending on the degree of task difficulty.
Phase |
Simplest method |
Most detailed and thorough method |
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SNMP information |
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Discovery |
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Status monitoring |
The NNMi default values are improved to suit most user requirements. Because there is no need to significantly change these default values, begin operation using the improved default values. |
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Event configuration and event reduction |
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