Cisco Catalyst 4500E series switch. 848 Gbps switching capacity with 250 Mpps of throughput. 4 10 Gigabit ethernet uplinks (SFP+). SFP support on uplinks to offer flexibility for up to 4 Gigabit Ethernet. 128K flexible netFlow entries in hardware. External USB and SD card support for flexible storage options. Flexibility to operate at 6 24 or 48 Gbps per line card slot with no performance degradation. IPv6 support in hardware providing wire-rate forwarding for IPv6 networks. Dynamic hardware forwarding-table allocations for ease of IPv4-to-IPv6 migration.