I've got a new server I need to make the new time source for the servers in
my tree. Very basic arrangement: I have one Single Reference time server
getting time from our router; all other servers are configured as
secondaries pointing to the Single. Here are the steps I believe I need to
take to point all servers to the new replacement:

-Make the new server a Single and point it to the router for time
-configure each secondary to point to the replacement server for time
-I need to keep the original server for a little longer, so change the
original Single to a secondary and point it to the new Single

That about the size of it? Will a reboot be necessary for the changes to
take effect.