It's definitely a Windows VM . I've never seen the .VMTP. refid before - not even when we were pointed at the old domain controllers. The IT staff is going to look at the servers for any anomalies with regards to NTP. I've forwarded that information to them.
Original Message:
Sent: 11-05-2024 09:06
From: Olivier Benghozi
Subject: VMTP in NTP association refid
Looks like a Microsoft Windows NTP server ?
https://www.researchgate.net/profile/Michael-Lombardi-4/publication/331219265_Rethinking_Timekeeping_for_Modern_IT_Solutions/links/5c828a80299bf1268d483bfa/Rethinking-Timekeeping-for-Modern-IT-Solutions.pdf
Inside a Windows VM, the VM Time Provider (VMTP) is an active component of W32Time. The Windows VM acts as an NTP client by relying on the VMTP to synchronize its system clock with that of the Hyper-V host. The Hyper-V host acts as an NTP server at a "higher" stratum. In NTP principles, a Sync-n-Scale enabled Hyper-V host occupies stratum 1, and its VMs are all at stratum 2.
Therefore VMTP is just the name of the time source used by your NTP Servers.
And, indeed, it's not properly synced with a proper time source, so their NTP stratum should be bad. You should use some kind of ntpdate to debug what it answers...
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Olivier Benghozi
Original Message:
Sent: 11-04-2024 14:51
From: JIM MICKENS
Subject: VMTP in NTP association refid
We had been syncing time on our EX switches to a Windows Active Directoy domain controller. The IT folks installed new DCs and scuttled the old ones that we had been using. After switching the NTP server settings to the new IPs, the EXs will no longer sync. When I do a show ntp association, I see .VMTP. under the refid for the servers. Doing a packet sniff on the firewall between them, I see communication back and forth.
jmickens@Clinton-4300-Core> show ntp associations
remote refid auth st t when poll reach delay offset jitter
====================================================================================
10.18.196.11 .VMTP. - 1 - 275 512 0 0.000 0.000 4000.00
10.18.196.12 .VMTP. - 1 - 271 512 0 0.000 0.000 4000.00
Does anyone know what VMTP means? I can't find anything on it, but certainly seems like the switch doesn't like it.
jmickens@Clinton-4300-Core> show ntp status
status=c011 sync_alarm, sync_unspec, 1 event, event_restart,
version="ntpd 4.2.0-a Sat Feb 24 02:16:07 2024 (1)",
processor="powerpc", system="JUNOS21.4R3-S6.5", leap=11, stratum=16,
precision=-19, rootdelay=0.000, rootdispersion=8.655, peer=0,
refid=INIT, reftime=00000000.00000000 Thu, Feb 7 2036 1:28:16.000,
poll=4, clock=ead3a241.c8ecc724 Mon, Nov 4 2024 14:42:57.784, state=1,
offset=0.000, frequency=-79.385, jitter=0.002, stability=0.000
jmickens@Clinton-4300-Core> set date ntp
4 Nov 14:43:32 ntpdate[55674]: no server suitable for synchronization found
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JIM MICKENS
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