Author : William Rogers
Topic Name : Configure Network Interface for Witness Traffic
Publication Name : vSAN Planning and Deployment
Product/Version : VMware vSphere/6.7
Question :
When configuring WTS for standard stretched cluster, do my new vmk's for the host at the 2 data sites use the same vlan or do each data site have it's own vlan for the WTS?
Moderator: Moved to vSAN
They can use seperate VLANs as long as there is sufficient routing between them. Obviously if you are able to stretch vLANs accross sites then you can do that also
There is good thread here. Might find relevant and answer your query and provide further tips.
vsan stretched cluster network design