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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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• set <strong>the</strong> hardware clock with NTP on page 76 (optional)<br />

• disable NTP on an interface on page 76 (optional)<br />

• configure a source IP address <strong>for</strong> NTP packets on page 77 (optional)<br />

For more detailed in<strong>for</strong>mation on <strong>the</strong> commands related to NTP, refer to .<br />

specify an NTP server<br />

<strong>Force10</strong> systems can only be an NTP client.<br />

<strong>FTOS</strong> synchronizes with a time-serving host to get <strong>the</strong> correct time. You can set <strong>FTOS</strong> to poll specific NTP<br />

time-serving hosts <strong>for</strong> <strong>the</strong> current time. From those time-serving hosts, <strong>the</strong> system chooses one NTP host<br />

with which to synchronize and serve as a client to <strong>the</strong> NTP host. As soon as a host-client relationship is<br />

established, <strong>the</strong> networking device propagates <strong>the</strong> time in<strong>for</strong>mation throughout its local network.<br />

Since a large number of polls to NTP time serving hosts can impact network per<strong>for</strong>mance, <strong>Force10</strong><br />

<strong>Networks</strong> recommends that you limit <strong>the</strong> number of polls in your network. Instead, configure <strong>FTOS</strong> to<br />

send NTP broadcasts to distribute <strong>the</strong> NTP in<strong>for</strong>mation throughout <strong>the</strong> network.<br />

To specify a time-serving host <strong>for</strong> <strong>the</strong> system, use <strong>the</strong> following command in <strong>the</strong> CONFIGURATION<br />

mode:<br />

Command Syntax Command Mode Purpose<br />

ntp server ip-address [key keyid] [prefer]<br />

[version number]<br />

You can use this command to configure multiple time serving hosts, one at a time.<br />

To view <strong>the</strong> NTP status, use <strong>the</strong> show ntp status command (Figure 28) in <strong>the</strong> EXEC privilege mode.<br />

Figure 28 show ntp status Command Example<br />

CONFIGURATION Configure an NTP server. Configure <strong>the</strong> IP<br />

address of a server and <strong>the</strong> following<br />

optional parameters:<br />

• key keyid: Configure a text string as <strong>the</strong><br />

key exchanged between <strong>the</strong> NTP server<br />

and client.<br />

• prefer: Enter <strong>the</strong> keyword to set this NTP<br />

server as <strong>the</strong> preferred server.<br />

• version number: Enter a number 1 to 3<br />

as <strong>the</strong> NTP version.<br />

<strong>Force10</strong>#sh ntp sta<br />

Clock is synchronized, stratum 2, reference is 100.10.10.10<br />

frequency is -32.000 ppm, stability is 15.156 ppm, precision is 4294967290<br />

reference time is BC242FD5.C7C5C000 (10:15:49.780 UTC Mon Jan 10 2000)<br />

clock offset is clock offset msec, root delay is 0.01656 sec<br />

root dispersion is 0.39694 sec, peer dispersion is peer dispersion msec<br />

peer mode is client<br />

<strong>Force10</strong>#<br />

74 Management

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