The value of tmnxOspfRestartExitRc indicates the outcome of
the last attempt at a Graceful restart.
none (1) no restart has yet been attempted.
inProgress (2) a restart attempt is currently underway.
completed (3) the last restart completed successfully.
timedOut (4) the last restart timed out.
topologyChanged (5) the last restart was aborted due to
a topology change.