Intermittent triggering of "Network Latency High" alert in NSX.

Products

• VMware NSX

Issue/Introduction

• Entries similar to the below are observed in /var/log/messaging-manager/messaging-manager.log:
  

  WARN EventReportProcessor-1-4 EventReportSyslogSender - MONITORING [nsx@6876 comp="nsx-manager" entId="########-####-####-####-############" eventFeatureName="communication" eventSev="warning" eventState="On" eventType="network_latency_high" level="WARNING" subcomp="messaging"] The average network latency between manager nodes and host <host-FQDN> <host-IP> is more than  150 ms for 5 minutes.

• Testing of the physical between the NSX Managers and the ESXi Transport Nodes shows no signs of obvious issues
• Logging is enabled on the default L2 Ethernet rule:

  rule 1 at 1 inout ethertype any stateless from any to any accept with log

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Environment

VMware NSX 4.x
VMware NSX Data Center 3.x 

Resolution

This is a condition that may occur in a VMware NSX environment.

 

Workaround

See resolution section of ESXi hosts may experience operational issues if L2 DFW default rule logging is enabled and apply the documented workaround. 

Additional Information

ESXi hosts may experience operational issues if L2 DFW default rule logging is enabled