• Silver-colored arista dcs-7800r3-36d-lc rack-mounted network switches with 36 ports and ventilation slots front view
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Arista

Arista DCS-7800R3-36D-LC | 7800R3 36-Port 400G Line Card, 14.4Tbps, QSFP-DD

DCS-7800R3-36D-LC

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Description

The Arista DCS-7800R3-36D-LC is a high-performance wirespeed line card designed for the 7800R3 Series modular chassis, delivering 36 ports of 400 Gigabit Ethernet via QSFP-DD interfaces. With 14.4 Tbps of forwarding capacity and up to 6 billion packets per second, this line card supports flexible breakout options for 10G, 25G, 50G, and 100G connectivity. Ideal for large-scale data center deployments, cloud environments, and high-density network aggregation requiring maximum throughput and deep buffering.

Features

36x 400 Gigabit Ethernet QSFP-DD ports with flexible speed support (10G to 400G)
- 14.4 Tbps wirespeed forwarding capacity with up to 6 Bpps throughput
- 24 GB deep packet buffer with 6 MB per-port allocation for lossless forwarding
- Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- Non-blocking full-mesh fabric connectivity with dynamic load balancing
- Single-stage switching architecture provides fair access to all ports
- Hot-swappable design for zero-downtime installation and maintenance
- Supports breakout configurations: 4x 100G, 8x 50G, or 16x 25G per 400G port
- Compatible with QSFP-DD, QSFP, and SFP optics via breakout cables
- Advanced Layer 2 features: VLANs, VLAN stacking, Spanning Tree Protocol, MLAG
- Advanced Layer 3 features: OSPF, BGP, IS-IS, EVPN, VXLAN routing
- FlexRoute support for optimized routing table scaling
- Accelerated sFlow and Algorithmic ACLs for advanced traffic monitoring and security
- Precision timing and network virtualization capabilities
- Full Arista EOS software support with programmable APIs and streaming telemetry
- Designed for data center interconnect, cloud networking, and provider edge deployments

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

36x 400G QSFP-DD ports
- Port flexibility: Up to 144x 100G or flexible 10G/25G/50G/100G with breakout cables
- Throughput: 14.4 Tbps bidirectional forwarding capacity
- Forwarding rate: Up to 6 billion packets per second (Bpps)
- Packet buffer: 24 GB total buffer memory (up to 6 MB per port for lossless forwarding)
- Architecture: Single-stage wirespeed design with non-blocking full-mesh fabric connectivity
- Compatibility: Arista 7800R3 Series chassis (7804R, 7808R, 7812R, 7816R)
- Hot-swappable design for zero-downtime maintenance
- Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- Flow-based dynamic load balancing across fabric modules
- Standards: QSFP-DD compliant, supports 400G, 200G, 100G, 50G, 25G, 10G optics and DAC/AOC cables
- Management: Arista EOS operating system with full CLI, SNMP, and API support

FAQs

Q: What chassis is this line card compatible with?
A: The DCS-7800R3-36D-LC is compatible with all Arista 7800R3 Series modular chassis, including the 7804R (4-slot), 7808R (8-slot), 7812R (12-slot), and 7816R (16-slot) chassis options.

Q: Can I use 100G or lower speed transceivers in the 400G ports?
A: Yes, the QSFP-DD ports support flexible port breakout configurations. Each 400G port can be broken out to support 4x 100G, or lower speeds including 50G, 25G, and 10G using appropriate optics or DAC/AOC cables, providing up to 144 total 100G ports per line card.

Q: What makes this line card suitable for high-density data centers?
A: The DCS-7800R3-36D-LC delivers 14.4 Tbps of throughput with deep packet buffering (24GB total, up to 6MB per port) and a Virtual Output Queue architecture that eliminates head-of-line blocking. This ensures deterministic performance even under congested conditions, making it ideal for large-scale Layer 2/Layer 3 cloud networks, overlay fabrics, and data center interconnect applications.

Q: Does this line card require additional licensing?
A: The base line card operates with Arista EOS without additional feature licensing for standard Layer 2 and Layer 3 functionality. However, advanced features like MACsec encryption require separate Enhanced Security Encryption licenses. Contact your Arista representative for specific licensing requirements.

Q: Is this line card hot-swappable?
A: Yes, the DCS-7800R3-36D-LC is fully hot-swappable, allowing for installation, removal, and replacement without powering down the chassis or disrupting traffic on other line cards, ensuring continuous operations and minimal downtime.

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