The Guest are connected to the virtual switch(es), so they do not directly need to detect the change. Assuming the ESXi host's network port as well as the physical switch port are configured for "Autosensing" and you are using an appropriate network cable, you should not have any issues.
One additional note. If you are going to connect the host to a managed switch, there might be some options - besides speed and duplex - you need to configuere, like the access mode, spanning-tree, VLAN tagging, ...
André