Regarding switches like Mellanox Voltaire VLT-30011 (QDR IB, managed). I see a gigabit ethernet port on the switch which in the manual (http://www.mellanox.com/related-docs/prod_ib_switch_systems/4036_2036_Installation_Manual.pdf) is labeled "for management", but it's also the uplink I take it? My intention is for one of the nodes in my cluster to act as login node, being reachable from the Internet.
I have seen BridgeX switches with "integrated ethernet gateways", but my interpretation of this is that the switch can handle ethernet (protocol) communication internally as well?