
TCP, FTP, TFTP, Telnet, NTP, and NetBIOS over IP Concepts
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Figure 2-6. NTP Time Servers Operating in Unicast Client Mode
Broadcast and Multicast Client Mode
In broadcast client and multicast client modes, the local NTP client will accept
NTP packets from every remote time server on the internet, provided the IP
destination address of the NTP packet matches the IP broadcast address of the
local NTP client. Once the NTP client receives NTP packets, it applies rules based
on the NTP protocol to select the remote time server with the greatest accuracy.
In broadcast client and multicast client modes, you can restrict specific time
servers from sending NTP packets to an NTP client by configuring access control
filters. You cannot, however, configure peers in either broadcast client or multicast
client mode.
We recommend that you use broadcast client mode and multicast client mode
when you have many clients on the network and only one remote time server, as
broadcasting reduces overall traffic volume on the network.
Server A
Server B
Peer list
NTP
clients
NTP
time
servers
A
B
C
TCP0006A
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