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G/C/B/A-Series logs "sntpPollSend: send failed - errno 51" errors

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TitleG/C/B/A-Series logs "sntpPollSend: send failed - errno 51" errors
Symptoms
Syslog periodically logs error message "sntpPollSend: send failed - errno 51"; 
<166>Apr 8 09:19:23 1.2.3.4-3 SNTP[186442144]: sntp_client.c(1240) 203 %% sntpPollSend: send failed - errno 51	
Environment
  • G-Series, firmware 6.03.00.0022 and higher
  • C5-Series, all firmware
  • C3-Series, firmware 6.03.00.0022 and higher
  • B5-Series, all firmware
  • B3-Series, firmware 6.03.00.0022 and higher
  • A4-Series, firmware 6.61.02.0007 and higher
Cause

By default the Securestack and G-Series send SNTP from the host interface and  that interface has  no route to the SNTP server.

Resolution
Configure a router interface as the SNTP interface
set sntp interface vlan 10
 
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