A migration is the process of upgrading individual SOA Security Manager components until your environment is operating at r12.1 SP3. Upgrading individual components consists of one or more steps during which you:
You upgrade individual components over an extended period to maintain system availability. A key to maintaining system availability is the order in which you upgrade components. During a migration, specific components that have been upgraded can continue to communicate with prior versions. This type of communication is known as mixed-mode support.
The following illustrates the concept of a migration:

For more information about migrating from r12.0 or r12.1, see the respective chapter
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