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## Related Documentation

- Stateful SRP Switchover Redundancy Modes
- Activating High Availability
- redundancy
- mode

# Guidelines for Activating High Availability

Before you activate high availability on the SRP modules, you must be aware of any high availability–related changes to SRP management commands. For information on high availability-related changes to SRP, see Unresolved xref.

You activate high availability (stateful SRP switchover) by launching Redundancy Configuration mode and issuing the mode high-availability command. The high-availability keyword enables high availability mode for stateful SRP switchover. In this mode, the router uses mirroring to keep the configuration and state of the standby SRP module coordinated with the configuration and state of the active SRP module.

When activating high availability, keep the following in mind:

- In an E Series router that supports stateful SRP switchover, both SRP modules must be running the same software release version in order to activate high availability mode.
- If high availability mode cannot become active because of different releases on the active and standby SRP modules, the system reverts to its default mode (file system synchronization).
- When active or pending, the router configuration files are mirrored from the active SRP module to the standby SRP module. All other files shared between the active and standby SRP modules are automatically synchronized using legacy synchronization methods.

## Related Documentation

- Stateful SRP Switchover Redundancy Modes
- Activating High Availability
- redundancy
- mode

#### Published: 2010-12-29

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