Safran SecureSync 2400 - NTP over Anycast

SecureSync will also send unsolicited NTP time packets to the local broad-
cast address at the Broadcast Interval specified by you.
5.
To utilize MD5 Authentication, select a Symmetric Key (see "Configuring
NTP Symmetric Keys" on page130.)
6. Click Submit, or press Enter.
To disable NTP broadcasting, simply uncheck the Broadcast box and click Sub-
mit.
2.15.12 NTP over Anycast
NTP (Network Time Protocol) is a packet network based synchronization pro-
tocol for synchronizing a client clock to a network master clock (see also "Con-
figure NTP" on page113.)
Anycast is a network routing protocol in which messages are routed to one of a
group of potential receivers via a single Anycast address, thus avoiding the need
to configure every client individually.
NTP over Anycast, as implemented in SecureSync, is a combination of the two
concepts, allowing SecureSync to:
I. Associate one of its network ports to an Anycast IP address, and
II. Remove itself as an available time source if its reference is lost or degraded,
and vice versa.
To learn more about NTP over Anycast, see also the respective Safran Tech Note.
Please note that SecureSync utilizes the OSPF (Open Shortest Path First) and
BGP (Border Gateway Protocol).
O S P F P r o t o c o l E X A M P L E :
If an active SecureSync NTP server has removed itself as an available time source from
the Anycast-capable network, the OSPF router will send a request for replacement to
the next nearest NTP server, serving under the same NTPoverAnycast address.
As soon as the first SecureSync server obtains a valid reference again, it will make itself
available to the OSPF router, which will then use it as a time source again, based on the
principle of shortest path available.
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CHAPTER 2 • SecureSync 2400 User Manual Rev. 5.2
2.15 Configure NTP