Comment by kazen44

Another magic word that Vmware has which no other vendor does the same is NSX. (network virtualization).

proxmox is lightyears behind this usecase, and so are most other vendors. Especially if you are building private/public clouds with multi tenancy in mind.

NSX is really well designed and scales nicely, (it even has MPLS/EVPN support for Telecom Service Provider integration).

Most open source and other commercial offerings have solved both the compute and storage aspect quite well. But on the networking front, they a really not comparable.

Proxmox for instance, only supports a vxlan encapsulation or vlans, without support for a proper control plane like EVPN. Heck, route injection by BGP is only doable by DIY'ing it ontop of proxmox.

"just using vlans" is not going to cut if you want to really scale across datacenters and with multiple tenants. NSX does this all really nicely without having to touch the network itself at all thanks to encapsulation and EVPN route discovery.