Using NTP
the name of your country at the end of the search string. When available, select NTP servers
that are stratum 1 over those that are stratum 2.
To add a server association:
1.
Go to NTP - Config in the web interface.
2.
Under Add/Edit Association, for Role, select Server.
3.
For Address, enter an IP address (recommended) or domain name.
4. (Optional) Configure the other settings under Add/Edit Association. For more inform-
ation, see NTP - Config (on page 43).
5.
Click SAVE.
6.
Click RESTART.
After restarting, the NTP daemon sends regular requests to the server and uses the replies
to compare the NTP server with other servers and peers. The NTP daemon selects the best
server or peer and synchronizes with it.
Also see Configuring NTP Clients (on page 158).
AddingPeerAssociations
A pair of peer associations lets two NTP servers evaluate each other as part of their clock
selection algorithms, but prevents "timing loops" where both servers lock to each other. This
approach is typically applied to clusters of NTP servers on a LAN or WAN, and provides
excellent synchronization and redundancy.
To create a pair of peer associations:
1.
On the SyncServer, go to NTP - Config in the web interface.
2.
Under Add/Edit Association, for Role, select Peer.
3.
For Address, enter the IP address (recommended) or domain name of the peer.
4. (Optional) Configure the other settings under Add/Edit Association. For more inform-
ation, see NTP - Config (on page 43).
5.
Click SAVE.
6.
Click RESTART.
7. Log into the other NTP server and repeat the process of creating a peer association that
points to the IP address or domain name of the SyncServer. For example, on a generic
NTP daemon, add the following line to the ntp.conf file:
peer 192.168.61.54
VerifyingServerandPeerAssociations
After configuring server and peer associations, verify that they are reachable.
To verify the factory default configuration, observe the SYNC LED for several minutes after
turning the power on. If the SYNC LED transitions from red to orange (stratum 2), the Syn-
cServer has synchronized with one of three default NTP servers. (Afterward, if the SYNC
LED transitions from orange to green the SyncServer has synchronized to a Hardware
Clock Input Reference and is operating at stratum 1.)
997-01520-02 Rev. F1.......................................................................... Page 155
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