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# Activating High Availability

You activate high availability (stateful SRP switchover) by launching Redundancy Configuration mode and issuing the mode high-availability command.

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.

To enable high availability, enter the following:

`

host1(config)#redundancy
host1(config-redundancy)#mode high-availability

`

mode

- Use the redundancy mode command to enable high availability.
- 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.

  | Note: High availability mode is currently available only on ERX-1440, ERX-1400, and ERX-700 routers that support dual SRPs.

- The file-system-synchronization keyword reverts the redundancy mode to its default. In this mode, the router uses file synchronization to keep the configuration of the standby SRP module coordinated with the configuration of the active SRP module.
- Example
  `
  host1(config-redundancy)#mode high-availability
  `
- Use the no version to return high availability mode operation to its default (file system synchronization).
- See mode.

redundancy

- Use to enter Redundancy Configuration mode.
- Example
  `
  host1(config)#redundancy
  host1(config-redundancy)#
  `
- There is no no version.
- See redundancy.

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