%IP-IP_NTP-5-SYNC_LOSS : : Synchronization lost

[icrncevic1]

RP/0/RP0/CPU0:Dec 27 20:10:45.211 CST: ntpd[336]: %IP-IP_NTP-5-SYNC_LOSS : Synchronization lost : 10.xx.xx.xx vrf VPNV4-MGMT : System clock selection failed
RP/0/RP0/CPU0:Dec 27 20:10:45.211 CST: ntpd[336]: %IP-IP_NTP-5-HP_CONN_LOST : High priority NTP peer connection lost - Stratum 2->3.
RP/0/RP0/CPU0:Dec 27 20:19:30.266 CST: ntpd[336]: %IP-IP_NTP-5-HP_CONN_RECOVERED : High priority NTP peer connection recovered - Stratum 3->2.

I am periodically seeing NTP Synchronization lost followed by NTP peer connection lost. I am not able to find network issues during these bounces. Are these considered expected behavior or can someone explain why and when to expect to see these bounces. 

[marce1000]

 - Probably related to bug(s) , this bug report is an example (only) : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCsz22456  , you don't mention the platform/model this is happening on ,however use latest advisory software version (if applicable) and check if that can  help , 

 M.

[icrncevic1]

Hi,

this is on NCS-540 Version 7.1.2

[marce1000]

 - Try : https://software.cisco.com/download/home/286324706/type/280805694/release/7.8.1

 M.

[balaji.bandi]

if this ASR check the  below link may help you :

https://community.cisco.com/t5/switching/asr-9006-ntp-sync-issue/td-p/2680208

still issue you need to provide more information what hardware and version of code ? where is NTP IP located you try to sync, is there any FW between ?

[icrncevic1]

This is on NCS-540 Version 7.1.2