[CAUSE] A tmnxRpkiNotifySession notification is generated when a rpki session either comes up or goes down. Possible reasons for this to happen is listed below: (a) a session goes down due to hold-timer expiry. (b) a session goes down due to failure of the TCP connection. (c) a session goes down due to session ID mismatch. (d) a session goes down due to sent or received Error Report PDU containing fatal error code (e) a session comes up (established state) [EFFECT] This may remove the routes learned from a particular rpki server if session goes down. Or start learning routes from a rpki session which was newly established. [RECOVERY] There is no recovery required for this notification.