The supported operating systems are listed in Table 7-8 on page 221 and Table 7-9 on  page 223. VLAN management enhancements are valid for supported OSA-Express features on z14  ZR1 defines as CHPID type OSD. The supported operating systems are listed in Table 7-8 on  page 221 and Table 7-9 on page 223. All OSA-Express$^{,12}$ features support VLAN prioritization, which is a component of the IEEE  802.1 standard. GARP VLAN Registration Protocol (GVRP) support allows an OSA-Express  port to register or unregister its VLAN IDs with a GVRP-capable switch and dynamically  update its table as the VLANs change. This process simplifies the network administration and  management of VLANs because manually entering VLAN IDs at the switch is no longer  necessary. The supported operating systems are listed in Table 7-8 on page 221 and  Table 7-9 on page 223. Link aggregation (IEEE 802.3ad) that is controlled by the z/VM Virtual Switch (VSWITCH)  allows the dedication of an OSA-Express$^{11,12}$ port to the z/VM operating system. The port  must be participating in an aggregated group that is configured in Layer 2 mode. Link  aggregation (trunking) combines multiple physical OSA-Express ports into a single logical  link. This configuration increases throughput, and provides nondisruptive failover if a port  becomes unavailable. The target links for aggregation must be of the same type. Link aggregation is applicable to CHPID type OSD (QDIO). The supported operating systems  are listed in Table 7-8 on page 221 and Table 7-9 on page 223. VLAN management enhancements GARP VLAN Registration Protocol Link aggregation support for z/VM Multi-VSwitch Link Aggregation Large send for IPv6 packets Multi-VSwitch Link Aggregation support allows a port group of OSA-Express features to span  multiple virtual switches within a single z/VM system or between multiple z/VM systems.  Sharing a Link Aggregation Port Group (LAG) with multiple virtual switches increases  optimization and utilization of the OSA-Express features when handling larger traffic loads.  Higher adapter utilization protects customer investments, which is increasingly important as  10 GbE deployments become more prevalent. The supported operating systems are listed in  Table 7-8 on page 221 and Table 7-9 on page 223. Large send for IPv6 packets improves performance by offloading outbound TCP  segmentation processing from the host to an OSA-Express feature by employing a more  efficient memory transfer into it.  Large send support for IPv6 packets applies to the OSA-Express$^{11,12}$ features (CHPID type  OSD) on z14 M0x, z14 ZR1, z13, z13s, zEC12, and zBC12. z13 added support of large send for IPv6 packets (segmentation offloading) for  LPAR-to-LPAR traffic. OSA-Express6S on z14 ZR1 added TCP checksum on large send,  which reduces the cost (CPU time) of error detection for large send. The supported operating systems are listed in Table 7-8 on page 221 and Table 7-9 on  page 223. 12 OSA-Express4S or newer. 264  IBM 14 Model ZR1 Technical Guide