[cisco-voip] CCX and NTP

[Matthew Huff]

If you are going to have local NTP servers,  you will need 3 for a quorum. 4 for redundancy.

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Matthew Huff             | 1 Manhattanville Rd
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OTA Management LLC       | Phone: 914-460-4039
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From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Huff
Sent: Monday, May 8, 2017 10:42 AM
To: Ben Amick <bamick at HumanArc.com>; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CCX and NTP


Hey Ben,



This has less to do with UCCX and more to do with the lack of time precision in Windows SNTP / NTP compared to the needs of UCOS. Yes, I know, die hard Redmond boys and girls will say that ever since Win2003 that isn't the case but sorry, it is. (read: https://technet.microsoft.com/en-us/library/cc773013%28v=ws.10%29.aspx). In fact, on page 84 (PDF page) of the latest SRND (http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab11/collab11.pdf) Windows NTP is a flat nono for Cisco UC period.



IOS routers are great but here is how I like to roll (excuse the crudeness of the drawing, put it together this morning before coffee). I typically use Linux servers for NTP because they are so darn useful for other utilitarian things ..... can't count how many times just having a Linux box on the network somewhere helped me out.



[cid:image001.png at 01D2C7E8.B89D1C90]


= Ryan =



________________________________
From: cisco-voip <cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>> on behalf of Ben Amick <bamick at HumanArc.com<mailto:bamick at HumanArc.com>>
Sent: Monday, May 8, 2017 10:12 AM
To: cisco-voip at puck.nether.net<mailto: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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