Alcatel Omni Switch/Router User Manual page 281

Alcatel switch/router release 4.5

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Servers 1a and 1b receive time information from, or synchronize with, a

as a radio clock. (In most cases, these servers would not be connected to the same

source, though it is shown this way for simplicity.) Servers 1a and 1b become stratum 1

servers and are peered with each other, allowing them to check

each other. These machines support machines 2a and 2b as clients, and these clients are

synchronized to the higher stratum servers 1a and 1b.

Clients 2a and 2b are also peered with each other for time checks, and become stratum 2

servers for more clients (3a and 3b, which are also peered).

In this hierarchy, the stratum 1 servers synchronize to the most accurate time source avail-

able, then check the time information with peers at the same stratum. The stratum 2 machines

synchronize to the stratum 1 servers, but do not send time information to the stratum 1

machines. Machines 2a and 2b in turn provide time information to the stratum 3 machines.

It is important to consider the issue of robustness when selecting sources for time synchroni-

zation. It is suggested that at least three sources should be available, and at least one should

be "close" to you in terms of network topology. It is also suggested that each

peered with at least three other same stratum clients, so that time information crosschecking

will be performed.

Peer Association

time source such

time information against

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