100GBASE-SR4 QSFP28 850nm 100m DOM MTP/MPO MMF Optical Transceiver Module for FS Switches US$ 99.00
Arista Networks SFP-25G-SR Compatible 25GBASE-SR SFP28 850nm 100m DOM LC MMF Optical Transceiver Module US$ 39.00
S5850-32S2Q, 32-Port Ethernet L3 Fully Managed Plus Switch, 32 x 10Gb SFP+, with 2 x 40Gb QSFP+ Uplinks US$ 2,659.00
S5800-8TF12S, 8-Port Gigabit Ethernet L3 Fully Managed Plus Switch, 8 x Gigabit Combo, with 12 x 10Gb SFP+ Uplinks, Hyper-Converged Infrastructure US$ 2,099.00
100G to four 25G split configuration between FS 25G switch and Arista 7160 switch.