This object is only used when IS-IS is manually activated or deactivated (in other words, enters or leaves the state with row status 'active' and admin status 'on'), and indicates which restart procedures (if any) are followed. During the activation period, IS-IS will use the value that was configured at the start of activation. The value may be changed at any time, but the new value will only take effect the next time that manual activation takes place. During deactivation, IS-IS will purge the local LSP from remote nodes if this object is set to 'none' or 'start'. Setting the object to 'restart' before deactivation will prevent the local LSP from being purged. A planned restart may be initiated by setting prvtIsisSysShutdown to 'true' and later to 'false'. Graceful restart procedures will only function correctly if the local LSP has not been purged, and so to initiate a planned restart, prvtIsisSysRestartActivationType should be set to 'restart' before deactivation.