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Tuesday, April 1, 2014

What’s the difference between NTP broadcast and NTP client/server mode?

What’s the difference between NTP broadcast and NTP client/server mode?Why is a Cisco Router a better NTP server than a PC?

These are two separate mode in talking to the server. Actually, in the broadcast mode, the clients listen. In client/server mode, the clients poll the server. You can use NTP broadcast if there is no WAN link is involved because of its speed. If you go across a WAN link use the client/server mode (by pollling) is more preferable. Broadcast mode is designed for a LAN because otherwise many clients may need to poll the server and create a lot of packets on the network. NTP multicast is not yet available in NTPv3, forthcoming in NTPv4.
  • Cisco's IOS NTP code is a full NTP server implementation.
  • NTP code in the IOS adjusts (or "disciplines") the system clock every second by the Local Clock routine involving a Phase Lock Loop. A PC doesn't usually have this kind of feature. Most of the Windows implementations are SNTP only. Unix does have a full NTP implementation.
  • Win2000 has a clock granularity of 10ms. This is too large for a precise protocol like NTP. If a Win2000 machine is used as a NTP server, it's clock may result in a 10ms jitter on the network but NTP is designed for a jitter of 1ms or less.

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