i know that this post is old, but I would I highly recommned what Rumple said. I have hit this before where the vmotion traffic saturated the link and interrupted the management traffic including the heartbeat. I put a host into manitenance mode and one of the VM failed to vmotion correctly due to losing the management traffic. It got hung up in limbo and had to manually have the process killed to bring it back online.
Now this was a dev vm so it wasnt a big problem, but it could be a big problem, esspecially if you have IP storage over converged networking links.
Now I either use egress traffic filtering as Rumple suggested, or keep the roles seperate.