Orolia SecureSync 2400 User Manual

5.
To utilize MD5 Authentication, select a Symmetric Key (see "Configuring NTP
Symmetric Keys" on page111.)
6.
Click Submit, or press Enter.
To disable NTP broadcasting, simply uncheck the Broadcast box and click Submit.
2.15.12 NTP over Anycast
NTP (Network Time Protocol) is a packet network based synchronization protocol for syn-
chronizing a client clock to a network master clock (see also "Configure NTP" on page96.)
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 Spectracom Technology
Brief (PDF).
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 avail-
able to the OSPF router, which will then use it as a time source again, based on the principle of
shortest path available.
2.15 Configure NTP
CHAPTER 2 • SecureSync 2400 User Manual Rev. 2
117

Orolia SecureSync 2400 Specifications

General

Brand	Orolia
Model	SecureSync 2400
Category	Recording Equipment
Language	English