Note that the synchronization process could take up to five minutes. If you see “Clock is unsynchronized” in the output of “show ntp status”, wait a moment and run the command again. If you so desired, you could use “debug ntp events” to watch the communications and see what is happening. Make sure that R1 becomes synchronized before beginning to configure R2 — a device providing NTP services will not do so until the device itself is fully synchronized.