"NETWORK_DOWN_ALERT" is generated in SDDC manager when there is no apparent cause.

Products

• VMware Cloud Foundation

Issue/Introduction

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. 

Environment

VMware Cloud Foundation 2.2.x

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. 

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.

1. Download and extract the contents of the attached switchhelper.zip file.
2. Use a file transfer utility to copy the extracted switchhelper.pyc file to the /tmp folder on the SDDC Manager Controller virtual machine.
3. SSH to the SDDC Manager Controller virtual machine as the root user.
4. 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

5. 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 

6. Restart the sosrest service:

systemctl restart sosrest 

Additional Information

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Collecting diagnostic information for VMware Cloud Foundation

Impact/Risks:
There are no risks/impacts associated with this alert.