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JUNOSe 11.1.x Service Availability Configuration Guide
During the disabled state:
While in the disabled state, the system operates as if it were configured for file system
synchronization (for example, NVS is synchronized every 5 minutes, if
autosynchronization is enabled).
If all criteria are met, high availability mode transitions to the initialization state.
Initializing State
After the SRP module transitions into the initializing state, bulk synchronization of
the memory and NVS occurs. This includes the following:
NOTE: Depending on the size of the configuration, this process can take several
minutes.
During the initializing state:
After initialization is completed, the system enters the active state.
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.
2.
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Stateful SRP Switchover States
If any one criterion is not met, the system remains in the disabled state, until
the criterion is met.
If a switchover occurs while the system is in the disabled state, the system
cold-restarts.
File synchronization of the primary NVS with the standby NVS
Mirroring of appropriate state and dynamic configuration information from the
active SRP (memory) to the standby SRP (memory)
If an unsupported application is configured during initialization, the system
completes initializing and enters the pending state.
If any other criterion becomes false (or is no longer met), the system enters the
disabled state.
If a switchover occurs while the system is in this state, the system cold-restarts.
When making changes or updates, applications create individual transactions,
perform the updates on the active SRP module, and post the transactions.
Following the updates, the active SRP module sends the changes to the standby
SRP module.
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