z/VM virtual switch
The IBM z/VM operating system virtual switch (VSWITCH) is built on guest LAN technology and consists of a network of virtual adapters that can be used to interconnect guest systems. The virtual switch can also be associated with one or more IBM Open Systems Adapter-Express (OSA) ports. This capability allows access to external LAN segments without requiring an intermediate router between the external LAN and the internal z/VM guest LAN.
The virtual switch can operate at Layer 2 (the data link layer) or Layer 3 (the network layer) ...