C5/C3-Series logs many "SNTP has changed system time" notifications

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Article ID: 16189 

Products
C5-Series, firmware 6.42.01.0046 and higher
C3-Series, firmware 6.42.01.0046 and higher

Changes
Configured for SNTP.

Symptoms
Notification messages stating 'SNTP has changed system time' (from a stack Manager unit) and/or 'Stack manager has changed system time' (from a stack Member unit) may be logged multiple times per day.

For example, extracted from 'show support' output:

support ->show current log

<165>Apr 20 04:57:15 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11933 %% SNTP has changed system time.
<165>Apr 20 17:34:51 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11935 %% SNTP has changed system time.
<165>Apr 21 01:38:13 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11937 %% SNTP has changed system time.
<15>Apr 21 11:56:02 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11939 %% SNTP has changed system time.
<165>Apr 21 20:48:29 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11942 %% SNTP has changed system time.
<165>Apr 22 08:33:48 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11944 %% SNTP has changed system time.
<165>Apr 22 20:20:10 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11946 %% SNTP has changed system time.
<165>Apr 23 08:12:57 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11948 %% SNTP has changed system time.
<165>Apr 23 18:37:10 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11950 %% SNTP has changed system time.
<165>Apr 24 04:11:00 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11952 %% SNTP has changed system time.
<165>Apr 24 17:31:17 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11954 %% SNTP has changed system time.
<165>Apr 25 03:45:54 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11956 %% SNTP has changed system time.
<165>Apr 25 15:37:36 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11958 %% SNTP has changed system time.
<165>Apr 26 02:07:09 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11961 %% SNTP has changed system time.
<165>Apr 26 11:02:49 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11963 %% SNTP has changed system time.
<165>Apr 26 22:51:20 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11981 %% SNTP has changed system time.
<165>Apr 27 09:14:29 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11983 %% SNTP has changed system time.
<165>Apr 27 20:45:55 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11985 %% SNTP has changed system time.
<165>Apr 28 05:41:34 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11987 %% SNTP has changed system time.
<165>Apr 28 14:42:33 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11990 %% SNTP has changed system time.
<165>Apr 29 00:50:46 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11992 %% SNTP has changed system time.
<165>Apr 29 09:51:45 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11994 %% SNTP has changed system time.
<165>Apr 29 20:12:46 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11996 %% SNTP has changed system time.
<165>Apr 30 09:27:43 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 11999 %% SNTP has changed system time.
<165>Apr 30 18:24:26 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12001 %% SNTP has changed system time.
<165>May 1 04:21:05 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12003 %% SNTP has changed system time.
<165>May 1 16:10:39 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12005 %% SNTP has changed system time.
<165>May 2 04:16:14 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12007 %% SNTP has changed system time.
<165>May 2 11:20:55 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12009 %% SNTP has changed system time.
<165>May 2 20:09:06 10.31.10.5-1 SIM[199163656]: sntp_client.c(2109) 12011 %% SNTP has changed system time.
<57> MAY 03 09:09:07 2014 STK1 BOOT[268430624]: bootos.c(1360) 345 %% Start of Code - Build:06.61.11.0006 Date:Mon Nov 25 18:59:39 2013
<110> MAY 03 09:10:10 2014 ST1 BOOT[140755864]: edb_bxs.c(1269) 346 %% User initiated last switch reset on unit 1, after 14947 seconds
<165>May 7 19:35:04 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2612 %% Stack manager has changed system time.
<165>May 13 11:07:53 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2614 %% Stack manager has changed system time.
<165>May 19 08:04:00 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2618 %% Stack manager has changed system time.
<165>May 25 16:35:49 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2620 %% Stack manager has changed system time.
<165>May 31 15:17:34 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2622 %% Stack manager has changed system time.
<165>Jun 6 17:37:00 0.0.0.0-1 SIM[140755864]: osapi.c(4008) 2624 %% Stack manager has changed system time.

Cause
This messaging is due to incremental local time corrections applied as a result of "drift" between the switch-maintained clock and the SNTP server's clock.

Solution
Functions as Designed (FAD).
In general no action is warranted; however, a firmware upgrade could reduce the frequency of such messaging.

For the C5 or C3, upgrade to 6.61 firmware 6.61.13.0006 or higher.
For the C5, upgrade to 6.81 firmware 6.81.02.0007 or higher.
Release notes state, in the 'Firmware Changes and Enhancements' section:
19249    Modified the logging behavior of SNTP to prevent excessive changed system time messages, "sntp_client.c(2109) 62 %% SNTP has changed system time".
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