• Gray metal arista dcs-7800r3a-36d2-lc server rack with black ventilation slots and mounting brackets shown from back side
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Arista

Arista DCS-7800R3A-36D2-LC | 7800R3A 36-Port 400G QSFP-DD Line Card Module

DCS-7800R3A-36D2-LC

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Description

The Arista DCS-7800R3A-36D2-LC is a high-performance 400GbE line card module designed for the 7800R3 Series modular chassis platforms. Featuring 36 QSFP-DD ports supporting speeds from 10G to 400G with 14.4 Tbps throughput and an integrated CPU, this line card delivers enterprise-grade scalability for large-scale data centers, cloud networking, internet peering, and data center interconnect applications. Compatible with DCS-7804, 7808, 7812, 7816, and 7816L chassis systems.

Features

FlexRoute engine with algorithmic Layer 3 forwarding for internet-scale routing tables
- Deep buffer Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- 16GB port buffer memory provides up to 40ms traffic buffering per ingress port
- Accelerated sFlow and IPFIX sampling at line rate for network telemetry
- Algorithmic ACLs for scalable access control and policy-based forwarding
- Full Layer 2 and Layer 3 feature set including VXLAN, EVPN, MPLS, Segment Routing
- Advanced QoS with hierarchical queuing, policing, and traffic shaping
- ECMP/UCMP, MLAG, and sub-millisecond convergence for high availability
- Hot-swappable design with online insertion and removal (OIR)
- Integrated line card CPU for distributed packet processing
- Standards-based QSFP-DD interfaces compatible with 400G-ZR and DAC/AOC cables
- Arista EOS with CloudVision integration, zero-touch provisioning, and RESTful API

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

Port Configuration: 36x 400GbE QSFP-DD ports
- Multi-Rate Support: Up to 36x 400G, 144x 100G, 232x 50G/25G/10G interfaces (with breakout cables)
- Throughput: 14.4 Tbps full duplex (28.8 Tbps bidirectional)
- Port Buffer: 16 GB deep buffer memory
- Line Card CPU: Integrated onboard CPU
- Form Factor: Modular line card for 7800R3 chassis
- Dimensions: 18.9" W x 2.1" H x 17.8" D (48.1 x 5.4 x 45.2 cm)
- Weight: 25.85 lbs (11.73 kg)
- Typical Power: 563W (779W maximum)
- Chassis Compatibility: DCS-7816L, DCS-7816, DCS-7812, DCS-7808, DCS-7804
- Cooling: Front-to-back airflow
- Management: Arista EOS with CLI, SNMP, NetConf, RESTful API (eAPI)

FAQs

Q: Which chassis models support the DCS-7800R3A-36D2-LC line card?
A: This line card is compatible with all Arista 7800R3 Series chassis including the 4-slot DCS-7804, 8-slot DCS-7808, 12-slot DCS-7812, 16-slot DCS-7816, and DCS-7816L models, providing flexibility for scalable data center deployments.

Q: What speeds can each QSFP-DD port support on this line card?
A: Each QSFP-DD port supports multiple speeds including 400G, 200G, 100G, 50G, 40G, 25G, and 10G using appropriate transceivers and breakout cables, delivering up to 232 total interfaces per line card when fully broken out to 10G/25G.

Q: Does the DCS-7800R3A-36D2-LC support encryption features?
A: The base -36D2 model does not include MACsec or TunnelSec encryption capabilities. For integrated encryption, consider the DCS-7800R3A-36DM2-LC variant which supports enhanced MACsec, IPsec, and VXLANsec at line rate.

Q: What routing scale does this line card support?
A: The DCS-7800R3A-36D2-LC includes FlexRoute engine support for internet-scale routing tables with flexible forwarding database allocation across MAC, routing, host, and ARP tables, ideal for cloud spine, internet peering, and DCI applications.

Q: Can I mix different 7800R3 line card models in the same chassis?
A: Yes, Arista 7800R3 chassis can accommodate any combination of 7800R3 and 7800R3A series line cards, providing deployment flexibility for mixed-density, mixed-speed, and mixed-feature configurations within the same system.

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