Symptoms
For VxRail 7.0.480 and above releases, if the existing nodes vmk0 and vmk2 MTU values are different, node addition validation will fail.
Cause
A new validator was introduced in 7.0.480 release, it expects the existing nodes vmk0 and vmk2 to have the same MTU settings as they are both considered as "Management network".
Resolution
The MTU validation for existing nodes vmk0 and vmk2 will be separated in future release, so that they can be set with different MTU values.
For current releases, please contact Dell Technical Support to resolve this issue and quote this knowledge base article.
Contact us at https://www.dell.com/support/incidents-online/en-us/contactus/dynamic