GLYPH<SM590000> Review changes to messages, monitoring information, and diagnostic tools. Many updates  are available for the following items: – Messages (IBM VTAMfi and TCP stack) – Netstat  (status, monitoring, and display information) – CS diagnostic tools (VIT, Packet trace, CTRACE, and IPCS formatted memory dumps) For more information about SMC-R planning and security considerations, see the SMC-R tab  on the Shared Memory Communications Reference Information page. For more information about SMC-D planning and security considerations, see the SMC-D tab  on the Shared Memory Communications Reference Information page. For more information about how to define SMC-D, see 15.2.2, “Defining an ISM PCIe  function” on page 372. For an overview of how to manage an SMC-D connection, see 10.5.4, “SMC-D management”  on page 261. HiperSockets provides the fastest TCP/IP communications between z/OS, z/VM,  IBM z/VSEfi, and Linux logical partitions within a z14 ZR1 CPC, that act like internal “virtual”  local area networks. This HiperSockets implementation is achieved by using the Licensed  Internal Code (LIC) and supporting device drivers in the operating systems. HiperSockets  establish a network with higher availability, security, simplicity, performance, and cost  effectiveness than can be achieved by using an external IP network. The HiperSockets function is based on the OSA-Express queued direct input/output (QDIO)  protocol and therefore, HiperSockets is called internal QDIO (iQDIO). The LIC emulates the  link control layer of an OSA-Express QDIO interface, and uses no physical cabling or external  networking connections. Data access is performed at memory speeds, which bypasses  external network delays and provides users high-speed logical LANs with minimal system  and network overhead. HiperSockets can be defined as Multiple Image Facility (MIF)-shared in a CSS and as  spanned channels across multiple CSSs. A HiperSockets CHPID can be seen as an  internal  LAN  to the server. The level of sharing is determined by the logical partitions you want to  grant access to that LAN. HiperSockets HiperSockets is supported by the following operating systems: On a z14 ZR1, HiperSockets supports the following functions:  Supported across HiperSockets on Internet Protocol Version 4 (IPv4) for applications.  Applications that use the broadcast function can propagate the broadcast frames to all  TCP/IP applications that use HiperSockets. This support is applicable in Linux, z/OS, and  z/VM environments. Virtual local area networks (VLANs) are supported by Linux on z Systems and z/OS V1R8  or later for HiperSockets. VLANs can reduce overhead by allowing networks to be  organized by traffic patterns rather than physical location. This enhancement allows traffic  GLYPH<SM590000> All in-service z/OS releases GLYPH<SM590000> All in-service z/VM releases GLYPH<SM590000> All in service z/VSE releases GLYPH<SM590000> Linux on Z GLYPH<SM590000> HiperSockets Broadcast  GLYPH<SM590000> VLAN support  Chapter 2. Planning considerations for CPC in PR/SM mode  25