MikroTik CRS812 DDQ 400G Rackmount Aggregation Switch

The MikroTik CRS812 DDQ (CRS812-8DS-2DQ-2DDQ-RM) is the switch that rewrites the entry price for 400G networking. For years, 400G meant six-figure budgets, vendor lock-in, and proprietary management software. The CRS812 DDQ delivers the same port speeds at USD 1,295 — with a RouterOS v7 feature stack that has been trusted in millions of deployments worldwide, and the operational simplicity of a platform your team already knows.

The port mix is the standout feature. Eight 50G SFP56 ports cover the server tier — fast enough for NVMe-over-Fabrics, GPU cluster interconnects, and high-throughput NAS workloads. Two 200G QSFP56 ports handle mid-tier aggregation or spine uplinks. Two 400G QSFP56-DD ports connect to the highest-bandwidth spine switches, core routers, or peer devices in the same tier. Every QSFP56 and QSFP56-DD port supports breakout mode — fan one 400G port out to 8× 50G, or one 200G port out to 4× 50G — giving you extraordinary port density flexibility without additional hardware.

The Marvell 98DX7335 switch chip handles hardware-level switching, routing offload, and traffic management with the efficiency expected of a purpose-built silicon solution at this tier. The quad-core AL52400 ARM64 CPU at 2 GHz with 4 GB RAM provides the compute headroom for full RouterOS v7 routing, advanced firewall rules, BGP/OSPF, MPLS, VLAN management, traffic shaping, SNMP monitoring, and scripted automation — simultaneously, without compromise.

Dual redundant hot-swap PSUs and 4× hot-swap cooling fans mean the CRS812 DDQ is designed for 24/7 production environments where downtime is not an option. Both PSU and fan modules can be replaced live — no restart, no service interruption. The G1251-0250WNA is the official replacement PSU for this platform.

Key features:

- 2× 400G QSFP56-DD ports — 400G full-duplex; breakout to 8× 50G or 2× 200G

- 2× 200G QSFP56 ports — 200G full-duplex; breakout to 4× 50G

- 8× 50G SFP56 ports — 50G full-duplex server tier connectivity

- All QSFP56/QSFP-DD ports support breakout modes: 1G / 2.5G / 5G / 10G / 25G / 50G

- 2× 1G/10G Ethernet ports — 10M/100M/1G/10G management or in-band connectivity

- Marvell 98DX7335 switch chip — advanced hardware switching and L3 offloading

- Quad-core AL52400 ARM 64-bit CPU, 2,000 MHz, 4 GB RAM, 512 MB NAND

- Dual redundant hot-swap AC power supplies — 100–240V, 50–60 Hz, 2× PSU slots

- 4× hot-swap cooling fans — live replacement, no restart required

- Max power consumption 134W (81W without attachments)

- RJ45 serial console port for out-of-band management

- CPU temperature, PCB temperature, and voltage monitoring

- RouterOS v7, License Level 6 — BGP, OSPF, MPLS, advanced firewall, traffic shaping, SNMP, scripting — no subscriptions, no locked features, free updates for life (minimum 5 years)

- Certified CE, EAC, RoHS | IP20

- Tested ambient temperature -10°C to +50°C, MTBF ~200,000 hours at 25°C

Compatible accessories (sold separately):

- DDQ+DA0001 — QSFP-DD 400G DAC 1m (USD 79)

- DDQ+DA0003 — QSFP-DD 400G DAC 3m (USD 109)

- DDQ+85MP01D — QSFP-DD 400G SR8 optical module, up to 100m (USD 159)

- G1251-0250WNA — 250W hot-swap replacement PSU (USD 79)

In the box: 2× IEC cords, rackmount rear support ears (2/2), rackmount ears (CRS), K-82 fastening set.

Ideal for: top-of-rack and leaf switching with 400G spine uplinks, campus core networks bridging 10G legacy infrastructure with modern 50G server tiers, service provider aggregation nodes, AI/GPU cluster east-west fabric, media production workflows with high-throughput storage requirements, and any environment where 400G connectivity at an accessible price point is the next logical infrastructure upgrade.