The HP 5500 EI Switch Series is comprised of Layer 2/3 Gigabit Ethernet switches that can accommodate the most demanding applications and provide resilient and secure connectivity as well as the latest traffic prioritization technologies to enhance applications on convergent networks. With complete IPv4/IPv6 dual-stack support,the series provides investment protection with an easy transition from IPv4 to IPv6 networks. The all-fiber model with dual power supplies is ideal for applications that require the highest availability.