Configuring Ntp - Nokia IPSO 4.0 Reference Manual

5

Configuring NTP

There are two approaches to configuring NTP in a cluster:
Using a device outside the cluster as the NTP server.
In this case you use the IP address of the server when configuring NTP on the cluster nodes.
Using the cluster master node as the NTP server.
In this case you use one of the cluster IP addresses when configuring NTP on the cluster
nodes. If the master node fails and another node becomes the master, the new master
becomes the time server.
Caution
Do not assign a specific node to be the time server for the cluster. If you configure NTP
this way and the master node fails, the other nodes will not get their time from another
server. This situation could lead to problems with firewall synchronization.
The most convenient way to set up NTP in a cluster is to use Cluster Voyager (or the CCLI)
because you need to perform the configuration steps only one time instead of performing them
on each node individually. The instructions provided in the following sections assume that you
are using Cluster Voyager.
Note
Nokia recommends that you keep NTP as a cluster sharable feature (the default setting) so
that if a node leaves and rejoins the cluster it will automatically obtain the proper NTP
settings.
NTP Server Outside the Cluster
If you use a device outside the cluster as the NTP server, do the following steps on the NTP
configuration page (you must enable NTP before you can access this page):
1. Log into Cluster Voyager.
2. Display the NTP Configuration page.
3. Enable NTP.
After you enable NTP, you see, you see additional options.
4. Enter the IP address of the NTP server under NTP Servers.
5. Make sure that the NTP Master choice is set to No.
6. Click Apply.
All the cluster nodes will now learn their time from the time server you specified.
7. Allow NTP traffic in the appropriate firewall rule.
240 Nokia Network Voyager for IPSO 4.0 Reference Guide