flow on a VLAN connection over HiperSockets and between HiperSockets and  OSA-Express Ethernet features. Traffic between HiperSockets and OSA-Express can be transparently bridged by using the  HiperSockets Network Concentrator. This configuration eliminates intervening network  routing overhead, which results in increasing performance and a simplified network  configuration. This improvement is achieved by configuring a connector Linux system that  has HiperSockets and OSA-Express connections defined to it. HiperSockets supports two transport modes on the z14 ZR1 Layer 2 (Link Layer) and  Layer 3 (Network and IP Layer). As with Layer 3 functions, HiperSockets Layer 2 devices can be configured as primary or  secondary connectors or multicast routers. These configurations enable high-performance  and highly available Link Layer switches between the HiperSockets network and an  external Ethernet. HiperSockets performance was increased by allowing streaming of bulk data over a  HiperSockets link between logical partitions. Multiple writes with fewer I/O interrupts  reduce processor usage both the sending and receiving logical partitions, and is  supported in z/OS. GLYPH<SM590000> IPv6 support on HiperSockets GLYPH<SM590000> HiperSockets Network Concentrator GLYPH<SM590000> HiperSockets Layer 2 support GLYPH<SM590000> HiperSockets multiple write facility GLYPH<SM590000> HiperSockets Completion Queue GLYPH<SM590000> HiperSockets Virtual Switch Bridge Support The HiperSockets Completion Queue function is designed to allow HiperSockets to  transfer data synchronously if possible, and asynchronously if necessary. This function  combines ultra-low latency with more tolerance for traffic peaks.  With the asynchronous support, during high volume situations, data can be temporarily  held until the receiver has buffers available in its inbound queue. This function provides  end-to-end performance improvement for LPAR to LPAR communication. The z/VM virtual switch is enhanced to transparently bridge a guest virtual machine  network connection on a HiperSockets LAN segment. z/VM 6.2 or later, TCP/IP, and  Performance Toolkit APARs are required for this support.  This bridge allows a single HiperSockets guest virtual machine network connection to also  directly communicate with the following devices:  In z/OS, HiperSockets was enhanced for zIIP exploitation. Specifically, the z/OS  Communications Server allows the HiperSockets Multiple Write Facility processing for  large outbound messages that originate from z/OS to be run on a zIIP. z/OS application workloads that are based on XML, HTTP, SOAP, Java, and traditional file  transfer can benefit from zIIP enablement by lowering general-purpose processor usage. When the workload is eligible, the HiperSockets device driver layer processing (write  command) is redirected to a zIIP, which unblocks the sending application. – Other guest virtual machines on the virtual switch – External network hosts through the virtual switch OSA UPLINK port GLYPH<SM590000> zIIP-Assisted HiperSockets for large messages For more information about the technical details of each function, see  IBM Z Connectivity  Handbook , SG24-5444. 26  IBM z14 Model ZR1 Configuration Setup