NTP, Easy as 1-2-3... Simplifying Network Time Protocol

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Our network devices need to agree on what time it is. That helps us with troubleshooting, keeps digital certificates working correctly, and even displays time on our IP phones. The great news is, the Network Time Protocol (NTP) will do that for us.
In this video, you'll learn the theory behind NTP and see how to configure a Cisco router to be an NTP time source and also to receive time from a time source.
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Kevin Wallace, CCIEx2 #7945 Emeritus (Collaboration and R&S)
Homepage: kwtrain.com
Twitter: / kwallaceccie
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NTP, Easy as 1-2-3, Simplifying Network Time Protocol
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[@JuiceManTech]

Thanks for the video, easier to understand from your delivery

[@MoustafaAcademy]

Simple and clear explanation, thanks, Kevin.

[@NhanNguyen-pd3pe]

the best video ever, short, clear, concise :), thank you sir

[@gabrielmatandiko1253]

Absolutely superb! Thanks Kevin

[@benja2a]

As always, very good explanation Kevin, Thanks.

[@jairusan]

Excellent. Thank you very much, Kevin.

[@sinanprof7264]

Excellent explanation. I so much appreciate your lessons. Thank you so much sir.

[@ahmadmansour1543]

This was awsome, thanks Kevin.

[@gaget_man]

Best explanation video of NTP I have seen

[@arefrufillalshanty4284]

You are the best.. Thank you very much for this amazing channel

[@mariusavram7823]

Very interesting! Thank you!

[@numansmail]

Another refresher thank yuo

[@hatemnegm2688]

Great as usual, we want more specially for CCNP Encore (350-401) Please

[@vainilk78]

that was a great video!

[@outbackbuildingsplus2964]

Thank you

[@majiddehbi9186]

looks good

[@Soundwave-F7Z]

Thanks bud. Why was your clock still Unsynchronized though?

[@kwallaceccie]

You're very welcome. Even though the clock did synchronize, you're correct that there was still an "Unsynchronized" message. That happens if the Root Dispersion value is greater than 1000ms, which it was because I was using Cisco VIRL rather than physical gear.

[@fisnet0]

By the way, root dispersion is the maximum clock time difference that was ever observed between the local clock and the root clock (stratum 1 clocks).

[@mostafabenabdalla4952]

very wonderful Mr.Kevin but there is somthing pops on my mind i wanna cisco l2 switch in the access layer to obtain clock from l3 switch from distribution layer i find it a bit difficult for me because i configured multple vlans plus i did some pruning and the reason why i want time sync is i have configured a syslog server and iwant these msgs to be generated with time and date on the server from each network device within my network . i feel lost at that point and i dont know what to do

[@IT-Presales]

Also upload a video on SNMP, MIB all in details...please

[@evolagenda]

You set the server as stratum 3, why then does the reference clock on the client show that incremeneted to stratum 4?

[@MichaelPontisso-mx1bq]

my raspberry pi with gps is a stratum 1 time source with pps support easy to make and cheap

[@user-ej3iw8lw3w]

ntp authentication is disabled by default. you enable it with ntp authenticate

[@outbackbuildingsplus2964]

123? Omg I get it now

[@majiddehbi9186]

first time here

[@salem2020s]

why it says "clock is unsynchronized"

[@kwallaceccie]

It's because the Root Dispersion Time is too high, as a result of doing the demo in CML rather than on physical gear.

[@salem2020s]

@@kwallaceccie You know actually i am asking because i saw in Cisco books they recommended to configure clock timezone and summer-time before configure clock set, and they didn't mention the reason but they just said that it's better, so i thought that could be the reason behind "unsynchronized Status", what do you say?.

[@kwallaceccie]

Interesting, I haven’t experimented with the order of those configuration commands.

[@salem2020s]

@@kwallaceccie This is a quote from Cisco's book "NTP’s job is to synchronize clocks, but NTP works best if you set the device clock to a reasonably close time before enabling the NTP client function with the ntp server command. For instance, my wristwatch says 8:52 p.m. right now. Before starting NTP on a new router or switch so that it synchronizes with another device, I should set the time to 8:52 p.m., set the correct date and timezone, and even tell the device to adjust for daylight savings time-and then enable NTP. Setting the time correctly gives NTP a good start toward synchronizing."

[@Jabberwocky4k]

isp's block this port now. Thanks a lot DDOS hackers.

[@levelupgoddess9289]

This video was absolutely no help. I am completey loss especially around the "summer time" part. Very unclear.