Networking Options in z/VM

The topics in this chapter detail the networking options that are available in z/VM® environments. The information explains two main types of network connectivity for guests: real hardware interfaces (such as OSA-Express, Network Express, HiperSockets, and Channel-to-Channel adapters) and virtual networking options (including guest LANs and virtual switches).

Real hardware options provide high bandwidth and direct external LAN access, with distinctions between IP (Layer 3) and Ethernet (Layer 2) modes. Virtual networks offer flexible, centralized management without physical connections that support both TCP/IP and non-TCP/IP protocols.

The information also covers features like QDIO/EQDIO architectures, VLAN support differences between guest LANs and virtual switches, link aggregation, port isolation, and bridging capabilities between virtual and physical networks. It highlights advantages of virtual networks such as reduced hardware costs, simplified management, and enhanced security, and provides guidance on choosing between guest LANs and virtual switches based on deployment needs.