Interesting, all subs for CUCM are pointed to the pub and cannot be changed, wonder why UCCX and CUC cannot be pointed to it.
On Mon, May 8, 2017 at 10:25 AM, Daniel Pagan <[email protected]> wrote: > Just adding my experience to this… > > > > I agree and can attest to the stratum-1 server caveat below. After some > time, the NTP client can get blocked and force you (the general “you”) to > update your entries in the near future. Of course multiple NTP entries can > be configured but if you’re doing proactive monitoring of syslog (or > specific syslog entries), or support multiple UC environments, it can get > rather annoying and time consuming. > > > > As for pointing UC apps to the UCM publisher… I opened a TAC case a while > back specifically to determine if this was officially supported. The idea > was to assigned all UC applications for a customer, per geographic region, > to their most local UCM publisher for NTP services. The customer wanted to > avoid IOS NTP servers, avoid using public NTP sources, and didn’t want to > spin up a small *NIX VM for this purpose either. > > > > Long story short, and after escalating to the CE’s lead, it was determined > that this configuration would not be supported, and any time > synchronization issues reported to TAC would first require the > configuration be modified before continuing forward. > > > > *“Cisco Call Manager might work properly as NTP Master but it is not > designed for that purpose or not even tested by developer. Publisher of > CUCM not supported to act as NTP Master [for non CUCM applications].”* > > > > We ended up using public NTP sources. > > > > Hope this helps > > > > - Dan > > > > > > *From:* cisco-voip [mailto:[email protected]] *On Behalf > Of *Charles Goldsmith > *Sent:* Monday, May 8, 2017 10:53 AM > *To:* Haas, Neal <[email protected]> > *Cc:* [email protected] > *Subject:* Re: [cisco-voip] CCX and NTP > > > > To expand on this, I would point to your voice gateways with everything > internal, then the voice gateways would either use an on-prem NTP server > that is radio sync'd or one that Neal has advised. That way, everything is > synced together with the same source. > > > > For UCCX and other apps, I point them to the UCM pub and the pub points to > the voice gateways. > > > > I've seen a lot of people advise for pool.ntp.org, but that has bitten > me. How often does an NTP process refresh from DNS? I suspect only on > reboot or a restart of the NTP process. I've seen too many NTP servers go > offline when using the pool addresses. Because of that, I've been sticking > with .gov based NTP on the voice gateway. > > > > Ryan Huff, one thing about pointing to strata 1 servers, most of them have > restrictions from what I've seen, while they work, they could block you for > not being approved if you send too many requests. > http://support.ntp.org/bin/view/Servers/StratumOneTimeServers has a list, > and while many have open access listed, if you look at the details, they > can still have restrictions. > > > > Just food for thought. > > > > On Mon, May 8, 2017 at 9:20 AM, Haas, Neal <[email protected]> wrote: > > Get an on-prem NTP server, if you cant spend the money, use: > > > > time.nist.gov global address for all servers Multiple locations > > utcnist.colorado.edu 128.138.140.44 University of Colorado, Boulder > > utcnist2.colorado.edu 128.138.141.172 University of > Colorado, Boulder > > time-nw.nist.gov 131.107.13.100 Microsoft, Redmond, > Washington > > > > Really, anything with a GOV, or EDU should be good. > > > > By the way, you should NEVER, EVER, EVER (can’t stress this enough) a > Windows Based NTP. Every place that I have went into and removed a Windows > Time server, everything has worked better! Windows just cant do time. I > went into a business with windows NTP, and the guy was checking time from > about 100 NTP servers, his time was off by three minutes. Took it down to 3 > and everything started to work. > > > > Thank You, > > > > Neal Haas > > > > *From:* cisco-voip [mailto:[email protected]] *On Behalf > Of *Ben Amick > *Sent:* Monday, May 8, 2017 7:12 AM > *To:* [email protected] > *Subject:* [cisco-voip] CCX and NTP > > > > What do you guys use for NTP on your CCX hosts? I’ve been informed by TAC > that “CCX does not support Windows based NTP” so I was thinking about just > pointing NTP towards my CCM hosts – is that a valid scenario? I figure that > since CCM is pretty much authoritative on everything for CCX as it is it > wouldn’t be a problem? > > > > *Ben Amick* > > Telecom Analyst > > > > > Confidentiality Note: This message is intended for use only by the > individual or entity to which it is addressed and may contain information > that is privileged, confidential, and exempt from disclosure under > applicable law. If the reader of this message is not the intended recipient > or the employee or agent responsible for delivering the message to the > intended recipient, you are hereby notified that any dissemination, > distribution or copying of this communication is strictly prohibited. If > you have received this communication in error, please contact the sender > immediately and destroy the material in its entirety, whether electronic or > hard copy. Thank you > > > _______________________________________________ > cisco-voip mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/cisco-voip > > >
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