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05-02-2018 11:23 PM
05-02-2018 11:23 PM
Hi
Am I the only one whose Aruba 2540- and 2620-series switches (firmware branch 16.02.0022m) can't keep their local time in sync when NTP protocol is used?
Configuration:
timesync ntp
no sntp
ntp unicast
ntp server x.x.x.x iburst
ntp enable
Statistics:
(config)# sh ntp statistics
NTP Global statistics information
NTP In Packets : 515
NTP Out Packets : 515
NTP Bad Version Packets : 0
NTP Protocol Error Packets : 0
(config)# sh ntp status
NTP Status Information
NTP Status : Enabled NTP Mode : Unicast
Synchronization Status : Synchronized Peer Dispersion : 0.00000 sec
Stratum Number : 4 Leap Direction : 0
Reference Assoc ID : 0 Clock Offset : 8.31725 sec
Reference ID : x.x.x.x Root Delay : 0.00246 sec
Precision : 2**-18 Root Dispersion : 8.99180 sec
NTP Up Time : 5d 17h 14m Time Resolution : 819 nsec
Drift : 0.00000 sec/sec
System Time : Thu May 3 08:52:09 2018
Reference Time : Thu May 3 07:16:20 2018
# sh ntp associations
NTP Associations Entries
Remote St T When Poll Reach Delay Offset Dispersion
--------------- ---- ---- ------ ----- -------- -------- -------- ----------
x.x.x.x 3 u 495557 10 177 0.000 0.000 16.00000
After 6 days it's already 8 seconds behind (real time vs. 'show time').
Or have I done something systematically wrong?
Thank You
Tigekala
Solved! Go to Solution.
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05-03-2018 02:49 AM - edited 05-03-2018 03:14 AM
05-03-2018 02:49 AM - edited 05-03-2018 03:14 AM
Re: Aruba switch local time not sync'ed
Can you provide the output of show ntp associations detail <IP ADDR> command (where <IP ADDR> should be changed with your NTP Server x.x.x.x IP address)?
Edit: what happen if you try ntp server x.x.x.x instead of ntp server x.x.x.x iburst?
I'm not an HPE Employee

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05-04-2018 03:30 AM
05-04-2018 03:30 AM
Re: Aruba switch local time not sync'ed
# show ntp associations detail x.x.x.x
NTP Association Information
IP Address : x.x.x.x Peer Mode : Server
Status : Config,Sane,Master Peer Poll Intvl : 17
Stratum : 3 Root Delay : 0.00165 sec
Ref Assoc ID : 1 Root Dispersion : 0.05344 sec
Assoc Name : NTP Association 1 Reach : 1
Reference ID : 195.80.x.x Delay : 0.00000 sec
Our Mode : Client Offset : 0.00000 sec
Our Poll Intvl : 11 Precision : 2**0
Dispersion : 16.00000 sec
Association In Packets : 615
Association Out Packets : 615
Association Error Packets : 0
Origin Time : Mon Jan 1 02:00:00 1990
Receive Time : Mon Jan 1 02:00:00 1990
Transmit Time : Mon Jan 1 02:00:00 1990
-------------------------------------------------------------------------
Filter Delay = 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Filter Offset = 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Without 'iburst' it took minutes for switch to set its local time to smthing else than 01/01/90
Tigekala
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05-10-2018 06:42 PM
05-10-2018 06:42 PM
Re: Aruba switch local time not sync'ed
After 6 days it's already 8 seconds behind
It's syncing every 17 seconds.
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05-11-2018 01:22 AM
05-11-2018 01:22 AM
Re: Aruba switch local time not sync'ed
It's hard to call that syncing when switch'es local time differs almost 10 seconds from real time.
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05-13-2018 11:40 PM
05-13-2018 11:40 PM
Re: Aruba switch local time not sync'ed
The point is, it can't be drifting for 8 days as it is syncing every 17 seconds, so there must be a problem with the sync. (or the source is rubbish).
Personally, I like a single internal source for time, that way I can be sure that all the desktops and all the infrastructure are getting the same time from a local source on the LAN. Also, I don't need multiple devices connecting through my gateway to get NTP - it's more efficient to have just 1 and to have that device redistribute time.
If I have my own source, then I have a Stratum1 NTP server pool that only accepts NTP queries from a second, Stratum 2, server pool that all my other devices query for NTP.
If I have to get time off the internet, then I use an internal NTP server pool to go and get that time and treat that as my "Stratum2" NTP server pool, and have all my internal hosts query that.
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05-16-2018 11:12 PM
05-16-2018 11:12 PM
Re: Aruba switch local time not sync'ed
@Vince-Whirlwind wrote:... so there must be a problem with the sync. (or the source is rubbish).
... although
1) NTP server x.x.x.x seems to feel OK:
ntpq -4 -p -n
remote refid st t when poll reach delay offset jitter
==============================================================================
127.127.1.0 .LOCL. 13 l 65d 64 0 0.000 0.000 0.000
+195.80.xx.xx 195.80.zz.zz 2 u 18 1024 377 0.467 -0.149 0.629
*195.80.yy.yy 195.80.ww.ww 2 u 320 512 377 0.466 0.169 0.262
2) other devices which use x.x.x.x as a (S)NTP server are in sync
3) If I switch from NTP to SNTP then switches are in sync again
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12-11-2018 06:39 AM
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