Symptoms
Alert "NETWORK_DOWN_ALERT" would be generated in SDDC manager multiple times. Analyzing the logs would not provide any definitive reason for the alerts being triggered.
Cause
This alert could be triggered as part of some network health checks failing.The alerts could be cosmetic or could refer to an actual network related issue.
Impact / Risks
There are no risks/impacts associated with this alert.
Resolution
This is a known issue affecting VMware Cloud Foundation 2.2.x and is resolved in 2.3
Workaround
Run the /opt/vmware/sddc-support/sos --health-check command on the SDDC Manager Controller virtual machine to better determine the source of the alert. Any component with a Red state will need to be investigated further.A full sos log bundle can be generated to collect logs from all VMware Cloud Foundation components for an in-depth review. See Collecting diagnostic information for VMware Cloud Foundation for more information.These alerts might be cosmetic and there may not be an actual network issue. In such cases, the following procedure might be used to avoid these alerts from being generated.
Download and extract the contents of the attached switchhelper.zip file.Use a file transfer utility to copy the extracted switchhelper.pyc file to the /tmp folder on the SDDC Manager Controller virtual machine.SSH to the SDDC Manager Controller virtual machine as the root user.Make a copy of the /opt/vmware/sddc_support/health/network/switchhelper.pyc file
cp /opt/vmware/sddc-support/health/network/switchhelper.pyc /opt/vmware/sddc-support/health/network/switchhelper.pyc.bkp
Copy the /tmp/switchhelper.pyc file to the to /opt/vmware/sddc_support/health/network/ folder:
cp /tmp/switchhelper.pyc /opt/vmware/sddc-support/health/network/switchhelper.pyc
Restart the sosrest service:
systemctl restart sosrest
Related Information
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