Spectracom NetClock 9400 Series, User Reference Manual

Page: 139 / 467

1.
Navigate to MANAGEMENT > NETWORK: NTP Setup .
2.
On the NTP Services panel, click the GEAR icon.
3.
The
Edit NTP Services
window will display. Check the
Broadcast
box.
4.
Select a Broadcast Interval . When NTP Broadcasting is selected, in addition to still
responding to NTP time requests sent from network appliances, NetClock will also send
unsolicited NTP time packets to the local broadcast address at the Broadcast Interval spe
cified by you.
5.
To utilize MD5 Authentication , select a Symmetric Key (see "Configuring NTP Symmetric
Keys" on page 118.)
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 "Configuring NTP" on page 95.)
Anycast is a network routing protocol in which messages are routed to one of a group of poten
tial receivers via a single Anycast address, thus avoiding the need to configure every client indi
vidually.
NTP over Anycast , as implemented in NetClock, is a combination of the two concepts, allowing
NetClock 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)
.
2.15 Configuring NTP
CHAPTER
2
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