[cisco-voip] CCX and NTP

[Charles Goldsmith]

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 <dpagan at fidelus.com> 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:cisco-voip-bounces at puck.nether.net] *On Behalf
> Of *Charles Goldsmith
> *Sent:* Monday, May 8, 2017 10:53 AM
> *To:* Haas, Neal <nhaas at co.fresno.ca.us>
> *Cc:* cisco-voip at puck.nether.net
> *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 <nhaas at co.fresno.ca.us> 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:cisco-voip-bounces at puck.nether.net] *On Behalf
> Of *Ben Amick
> *Sent:* Monday, May 8, 2017 7:12 AM
> *To:* cisco-voip at puck.nether.net
> *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
>
>
>
>
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