Marvin Rhoads Tue, 05/05/2009 - 15:48
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The IOS command reference reports that the command was introduced in 12.1 and is supported in the 12.2 mainline and the 12.2SX train

Software Advisor ( doesn't appear to break out that command specifically in the "Features supported in 12.2(50)SE" page, either for IP Base or Advanced IP Services images.

The release notes ( have several multicast caveats, but ntp multicast client isn't among them.

markschnabel Tue, 05/05/2009 - 17:23
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I have found the same information, or lack of information. We are running 12.2(46) and the command is there, but do not know if it is supported. I will probably need to open a TAC case to verify.


thegrave2000 Sun, 01/31/2010 - 03:46
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Did TAC reply? I'm facing the same issue currently, running 12.2(SE)52 Universal image. Command seems to be there but no NTP packets are transmitted or processed.

rmarosko Fri, 06/21/2013 - 07:42
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Sorry for resurrecting an old thread, but this still appears to be an issue.

I am discovering this to be the same issue on a 3560X running 15.0(2)SE2. I have confirmed with monitor session that the switch is issuing IGMP report packets for the group in response to IGMP queries from the upstream switch, and I have confirmed that the NTP multicast ( packets are being delivered once from each source every 64 seconds, but the switch steadfastly remains in a "Clock is unsynchronized, stratum 16" state. If I configure the ntp servers, then the bidirectional unicast packets will cause the system to sync up, but that's fairly self-defeating the purpose of being a multicast client.


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