Active State

During the active state, the data that was synchronized from the active SRP module to the standby SRP module during initialization remains synchronized through mirroring updates.

Mirroring updates occur as follows:

1. When making changes or updates, applications create individual transactions, perform the updates on the active SRP module, and post the transactions.
2. Following the updates, the active SRP module sends the changes to the standby SRP module.
3. The standby SRP module replays the updates (in the order in which they were committed on the active SRP module) and makes the appropriate changes for each changed application.
4. Updates that need to be stored in NVS (that is, for static configurations) are updated in NVS.

   Note: While in the active and pending states, the CLI synchronize command does not update configuration files; these files are updated by the mirroring process.

During the active state:

• If a switchover occurs while the router is in the active state, the standby SRP module performs a warm restart (that is, stateful SRP switchover is in effect); the standby SRP module uses the configuration located in NVS.
• If an unsupported application is configured, the system transitions to the pending state.
• If any other criterion changes (is no longer met), the system transitions to the disabled state.

  Note: Changes made in manual commit mode are maintained, uncommitted, in the standby SRP memory until a trigger to commit occurs; if a switchover occurs while in this mode, the standby SRP module uses the configuration in memory.

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