The Arista OSFP-400G-LR4 is a OSFP 400GBASE-LR4 module from Arista Networks for 400 Gbps links. It plugs into a OSFP port on an Arista switch and is used for 400G spine and super-spine fabrics, AI/ML clusters, 4 × 100G breakout and data-centre interconnect.

Arista specifies the OSFP-400G-LR4 for 10 km on duplex single-mode fiber.

Per Arista's published optics data sheet, the OSFP-400G-LR4 transmits −2.7 to +5.1 dBm/lane and receives −9 to +5.1 dBm/lane.

The OSFP-400G-LR4 uses a Duplex LC connector on duplex single-mode (G.652), at 1271–1331 nm (4 lambda CWDM). Both ends of the link must use the same optical standard.

It works in Arista switches with OSFP ports that support this optic. Send us your switch model and EOS version and we will check it against Arista's Transceiver and Cable Guide before dispatch, so you only receive a module that works in your port.

It depends only on your switch port. OSFP ports need OSFP optics and QSFP-DD ports need QSFP-DD optics; they are not mechanically interchangeable. If both ends run the same optical standard (e.g. DR4 to DR4), an OSFP module and a QSFP-DD module interoperate over the fibre.

Yes. Next Gen Networks supplies original Arista Networks optics, not third-party lookalikes or grey-market stock. Every unit is checked before dispatch, and we share the serial numbers on request so you can verify them in EOS ('show inventory').

The Arista OSFP-400G-LR4 price in India depends on quantity, delivery city and current stock. Next Gen Networks supplies it with a GST invoice (input tax credit ready) and pan-India dispatch from New Delhi. Send the part number, quantity and delivery city on WhatsApp +91-7827955775 or email Sales@nextgennetworks.in and we reply with a GST quote.

Arista lists maximum power of 12 W for the OSFP-400G-LR4. Check your switch's per-port power budget for dense deployments.