The HPE Altoline 6921 Switch Series are top-of-rack (TOR) or spine switches for high-performance data centers. In a compact 1RU form factor, these switches provides line-rate L2 and L3 switching across up to 48 1/10GBASE-T or 1/10 GbE SFP+ ports, with 6 x 40GbE QSFP+ uplink connections. The HPE Altoline 6921 Switch Series can be deployed as a TOR switch supporting 10GbE server connections, or as a spine switch, supporting 10GbE interconnects. The HPE Altoline 6921 Switch Series a bare-metal switches loaded with the Open Network Install Environment (ONIE), which supports the installation of compatible independent switch OS offerings.