The VSAN and vMotion distributed port groups in a VMware Cloud Foundation environment have an incorrect MTU value

Products

• VMware Cloud Foundation

Issue/Introduction

Symptoms:
Upon completion of Bringup in VMware Cloud Foundation 2.3, it is observed that the MTU value for the VSAN and vMotion distributed port groups is set to 8940 when it should be 9000.

Environment

VMware Cloud Foundation 2.3.x

Resolution

This is a known issue affecting VMware Cloud Foundation 2.3.0. This issue is resolved in VMware Cloud Foundation 2.3.1.

Workaround:
To work around this issue, the MTU value can be updated to 9000 for the VSAN and vMotion distributed port groups.

1. Download the 52969_set_vsan_vmotion_mtu.zip file attached to this article.
2. Extract the set_vsan_vmotion_mtu.py script from the downloaded file.
3. Use a file transfer utility to copy the set_vsan_vmotion_mtu.py script to the /tmp folder on the SDDC Manager Controller virtual machine.
4. Log in to the SDDC Manager Controller virtual machine as the root user.
5. Issue the following command to execute the /tmp/set_vsan_vmotion_mtu.py script:

python /tmp/set_vsan_vmotion_mtu.py

Note: To implement this fix on a single workload domain, execute the script in the following fashion:

python /tmp/set_vsan_vmotion_mtu.py --domain-name <workload domain name>

Additional Information

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