Tasks
To verify other configurations, visit the NTP - Assoc page. After several minutes of operation,
Reach should show a value greater than 0 for each association. If Reach equals 0, that asso-
ciation is "unreachable".
For unreachable associations, check the following items:
n The physical network connections.
n The IP addresses of the NTP associations.
n
On the NETWORK - Ethernet page:
n If the NTP association uses a domain name instead of an IP address, the man-
agement port (LAN1) must have a valid DNS server address.
n If Allowed Access is configured, check that it isn't blocking traffic with the NTP
associations and DNS server.
AddingBroadcastAssociations
Broadcast associations can be used to:
n Reduce network traffic when a very large number of NTP clients are present on a LAN.
n Reduce the NTP load on the SyncServer if the NTP LED is orange or red.
A SyncServer with a broadcast server association broadcasts NTP messages to the subnet
approximately every 64 seconds. After exchanging calibration messages with the server, the
NTP broadcast clients settle into a routine of listening for, and synchronizing with, the NTP
broadcast messages.
Microsemi recommends consulting with your IT department or network administrator before
broadcasting NTP. The user should configure the scope of the broadcast address to cover
the intended subnet. Also note that some network routers are configured to block broadcast
messages.
Note: To protect against broadcasts from an unauthorized source, the user must configure
NTP authentication on the broadcast server and broadcast clients.
For more information, see NTP - Config (on page 43).
Creating a broadcast association
To configure the SyncServer as a broadcast server:
1. Configure authentication as described in Using NTP Authentication (on page 160).
For example, use NTP - MD5 to generate and download keys to your workstation.
2.
Add or edit an association on the NTP - Conf page.
3.
For Role, select Broadcast.
4.
For Address, enter an appropriate broadcast address for the subnet.
5.
For MD5 Key, select the appropriate method, Key or Auto.
6.
If selecting Key, also select a key number, 1 through 16.
7.
Click the SAVE button.
8.
Click the RESTART button. When the NTP daemon finishes restarting, it broadcasts NTP
messages every 64 seconds.
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