25GbE SFP28 Specifications • Ethernet - 25GbE / 10GbE / 1GbE - IEEE 802.3ad, 802.1AX Link Aggregation - IEEE 802.1Q, 802.1P VLAN tags and priority - IEEE 1588v2 - Jumbo frames support (9.6KB) • Enhanced Features: - Hardware-based reliable transport - Collective operations offloads - Vector collective operations offloads - 64/66 encoding - Dynamically Connected transport (DCT) - Enhanced Atomic operations - Support for MSI/MSI-X mechanisms • Storage Offloads: - RAID offload - erasure coding (Reed-Solomon) offload • CPU Offload Features: - RDMA over Converged Ethernet (RoCE) - TCP/UDP/IP stateless offload - LSO, LRO, checksum offload - RSS (can be done on encapsulated packet), TSS, HDS, VLAN insertion/stripping, Receive flow steering - Intelligent interrupt coalescence • Overlay Networks: - Stateless offloads for overlay networks and tunneling protocols - Hardware offload of encapsulation and decapsulation of NVGRE and VXLAN overlay networks • Hardware-Based I/O Virtualization: - Single Root IOV - Multi-function per port - Multiple queues per virtual machine - VMware NetQueue support • Virtualization: - SR-IOV: Up to 256 Virtual Functions - SR-IOV: Up to 16 Physical Functions per port • Management Features: - Remote boot over iSCSI - PXE and UEFI • OS Support: - RHEL/CentOS - Windows - FreeBSD - VMware