Lenovo 3873-AR3 B300 24 x Ports SFP+ 8Gb/s (16 x Ports Active) Managed 1U Rack-Mountable Fibre Channel SAN Switch. In Stock Brand: Lenovo Part Number: 3873-AR3 Category: Transceiver Availability: In Stock Shipping: Fast US-based shipping Order the Lenovo 3873-AR3 today from ProDisk Network — your trusted source for enterprise IT hardware. All products are quality-tested and backed by our support team.
The 3873-AR3 is a Lenovo transceiver component with capacity 8 GB, interface Fibre Channel, data rate 8 Gb/s. Pricing on the 3873-AR3 is quote-based — email sales@prodisknetwork.com or use our live chat for a quote within one business day.
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Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the 3873-AR3 are shown on this page.
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Quick Answer: Is the 3873-AR3 compatible with my switch?
Pro Disk Network validates every 3873-AR3 against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the 3873-AR3 ship?
If in stock, the 3873-AR3 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
The 3873-AR3 is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
Spine-Leaf Fabric — Top-of-rack 25G/100G aggregation between leaf and spine switches. Match speed and form factor across both endpoints.
Server Uplink — 10G/25G server-to-leaf uplink — pair with matching DAC or AOC at the host NIC to avoid optic mismatch.
DCI (Data Center Interconnect) — Inter-DC routing or aggregation. LR4/LR8 transceivers for 10–80 km, ER4 for 40 km, ZR4 for coherent long-haul.
Campus Distribution — Catalyst-class campus distribution between IDF and MDF closets. PoE+ where wireless APs and IP phones share infrastructure.
What is the 3873-AR3?
The 3873-AR3 is a Lenovo network interface module with capacity 8 GB and interface Fibre Channel, manufactured by Lenovo. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of 3873-AR3
Pros
Matched-pair option for redundant link orders
Cabling and DAC/AOC labels clearly mark optic class
Cons
DAC cables capped at 7 m — use AOC or fibre for longer runs
SR optic vs LR optic confusion — verify before ordering
Refurbished tier optic does not include retail vendor packaging
Frequently Asked Questions about 3873-AR3
Is the 3873-AR3 a genuine Lenovo part?
Yes. Pro Disk Network sources every 3873-AR3 as factory-original Lenovo inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Lenovo servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Is the 3873-AR3 compatible with my switch?
Pro Disk Network validates every 3873-AR3 against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the 3873-AR3 ship?
If in stock, the 3873-AR3 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
What is the warranty on the 3873-AR3?
New 3873-AR3 units carry the full Lenovo manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the 3873-AR3?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
3873-HC4 — Lenovo 3873-HC4 B300 24 x Ports SFP+ 8Gb/s 1U Rack-Mountable Fibre Channel SAN Switch — $468.42
3873AR1 — 3873AR1 - Lenovo 8Gb Fibre Channel 24 Port Rack-Mountable Switch by Brocade — $1,575.75
3873AR2 — 3873AR2 - Lenovo Brocade 6505 FC SAN Switch — $4,509.28
Pro Disk Network Buyer’s Guide: Transceiver
Optic Coding, Vendor Lock-In, and Multi-Vendor Compatibility
Networking optics — SFP, SFP+, QSFP+, QSFP28 — are physically interoperable across vendors but logically restricted by firmware coding. The 3873-AR3 is coded for a specific vendor family at our factory step before shipping, which preserves the OEM warranty workflow and allows the optic to be recognised without ‘service unsupported-transceiver’ CLI overrides. Mixing third-party optics with same-vendor optics in the same chassis is safe; mixing across vendor codings sometimes triggers warnings in the switch log.
Bandwidth Sizing for Spine-Leaf, EVPN-VXLAN, and Hyperconverged Storage
For EVPN-VXLAN overlays, the 3873-AR3 carries the underlay tunnels in addition to the workload traffic. Plan for VXLAN encapsulation overhead (50 bytes) plus MTU headroom; set the underlay MTU to 9216 (jumbo frames) and the overlay MTU to 9000. Make sure both the 3873-AR3 and the connected NICs support jumbo frames — some older NICs cap at 9000-byte payloads even when jumbo-enabled.