GarrettCom MNS-6K-SECURE 14.1.4 Manual Do Utilizador

Stratum 2 devices will peer with other Stratum 2 devices to provide more stable and 
robust time for all devices in the peer group. Stratum 2 devices normally act as servers for 
Stratum 3 NTP requests. 

These devices employ exactly the same NTP functions of peering and data sampling as 
Stratum 2, and can themselves act as servers for lower strata, potentially up to 16 levels. 
NTP (depending on what version of NTP protocol in use) supports up to 256 strata. 

 
This is summarized in the figure below. 
 

 

Special purpose receivers are available for many time-dissemination services, including the 
Global Position System (GPS) and other services operated by various national governments. 
For reasons of cost and convenience, it is not possible to equip every computer with one of 
these receivers. However, it is possible to equip some number of computers, routers or 
switches acting as primary time servers to synchronize a much larger number of secondary 
servers and clients connected by a common network.  

 

 

Several Magnum 6K switches with MNS-6K-SECURE can act as Stratum 2 or 
Stratum 3 servers. Make sure the SNTP client is configured to synchronize 
information from other Stratum 1 or Stratum 2 servers.  
 

 provides a list of NTP servers available by continent/country. For 

example, as of this writing, for North America, north-america.pool.ntp.org has 
over 500 NTP servers. 

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