05-05-2009 10:14 AM
Can anyone point me where I can find if the 3750 supports the ntp multicast client command?
05-05-2009 03:48 PM
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 (http://tools.cisco.com/Support/Fusion/FusionHome.do) 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 (http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_40_se/release/notes/OL13860.html#wp539899) have several multicast caveats, but ntp multicast client isn't among them.
05-05-2009 05:23 PM
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.
thanks
01-31-2010 03:46 AM
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.
06-21-2013 07:42 AM
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 224.0.1.1 group in response to IGMP queries from the upstream switch, and I have confirmed that the NTP multicast (224.0.1.1/udp/123) 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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