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FTOS Configuration Guide for the C-Series - Force10 Networks

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To view <strong>the</strong> configured NTP time servers and <strong>the</strong>ir status, use <strong>the</strong> show ntp associations command<br />

(Figure 29) in <strong>the</strong> EXEC privilege mode.<br />

Figure 29 show ntp associations Command Example<br />

configure NTP broadcasts<br />

With <strong>FTOS</strong>, you can receive broadcasts of time in<strong>for</strong>mation. You can set interfaces within <strong>the</strong> system to<br />

receive NTP in<strong>for</strong>mation through broadcast.<br />

To configure an interface to receive NTP broadcasts, use <strong>the</strong> following commands in <strong>the</strong> INTERFACE<br />

mode:<br />

Command Syntax Command Mode Purpose<br />

ntp broadcast client INTERFACE Set <strong>the</strong> interface to broadcast NTP packets.<br />

To view <strong>the</strong> NTP configuration on <strong>the</strong> interface, use <strong>the</strong> show config command in <strong>the</strong> INTERFACE mode.<br />

configure NTP au<strong>the</strong>ntication<br />

NTP au<strong>the</strong>ntication and <strong>the</strong> corresponding trusted key provide a reliable means of exchanging NTP<br />

packets with trusted time sources. NTP au<strong>the</strong>ntication begins when <strong>the</strong> first NTP packet is created<br />

following <strong>the</strong> configuration of keys. NTP au<strong>the</strong>ntication in <strong>FTOS</strong> uses <strong>the</strong> MD5 algorithm and <strong>the</strong> key is<br />

embedded in <strong>the</strong> synchronization packet that is sent to an NTP time source.<br />

To configure NTP au<strong>the</strong>ntication, use <strong>the</strong>se commands in <strong>the</strong> following sequence in <strong>the</strong><br />

CONFIGURATION mode:<br />

Step Command Syntax Command Mode Purpose<br />

1 ntp au<strong>the</strong>nticate CONFIGURATION Enable NTP au<strong>the</strong>ntication.<br />

2<br />

<strong>Force10</strong>#show ntp associations<br />

remote ref clock st when poll reach delay offset disp<br />

==========================================================================<br />

100.10.10.10 .LOCL. 1 710d 16 0 13.41 5.100 16000.0<br />

* master (synced), # master (unsynced), + selected, - candidate<br />

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

ntp au<strong>the</strong>ntication-key number md5<br />

key<br />

CONFIGURATION Set an au<strong>the</strong>ntication key. Configure<br />

<strong>the</strong> following parameters:<br />

number: Range 1 to 4294967295.<br />

This number must be <strong>the</strong> same as <strong>the</strong><br />

number in <strong>the</strong> ntp trusted-key<br />

command.<br />

key: Enter a text string. This text string<br />

is encrypted.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 75

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