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Arista

Arista DCS-7800R3A-36DM2-LC | 7800R3A 36-Port 400GbE QSFP-DD Line Card, MACsec, CPU

Arista DCS-7800R3A-36DM2-LC | 7800R3A 36-Port 400GbE QSFP-DD Line Card, MACsec, CPU

DCS-7800R3A-36DM2-LC

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Description

The Arista 7800R3A Series 36-port 400GbE QSFP-DD line card delivers up to 28.8 Tbps of full-duplex, wire-speed bandwidth with Enhanced MACsec (TunnelSec) encryption and an onboard CPU, purpose-built for large-scale data centre and cloud core deployments. Designed for the Arista 7800R modular chassis family, it supports AES-256-GCM bulk encryption across MACsec, IPsec, and VXLANsec simultaneously with zero forwarding penalty — making it the ideal choice for secure DCI, WAN interconnect, and hyperscale fabric buildouts.

Each port supports 400G native or 4x 100G breakout, and a deep-buffer VOQ architecture (~40 ms per ingress port) eliminates head-of-line blocking for mixed elephant and mice flow workloads. The FlexRoute Engine enables full Internet routing table scale in hardware, while Algorithmic ACLs and accelerated sFlow at 400G provide granular policy control and traffic visibility. Compatible with 7804R, 7808R, 7812R, and 7816R chassis. Available now at iptrading.com.au — competitive prices and local support.

Features

- Wire-speed line-rate encryption on all 36 x 400GbE ports with zero performance penalty
- TunnelSec for encrypted WAN/DCI tunnels: MACsec, IPsec (RFC 4303), and VXLANsec
- AES-256-GCM bulk encryption for secure data centre interconnect and cloud edge
- FlexRoute™ Engine for full Internet routing table scale in hardware
- Algorithmic ACLs enabling flexible access control, policy-based forwarding, and network telemetry
- Accelerated sFlow at 400G line rate for traffic visibility and programmatic steering
- Deep-buffer VOQ architecture (~40 ms per ingress port) eliminates head-of-line blocking
- Cell-based fabric provides fair handling of both elephant and mice flows
- Advanced traffic scheduler: weighted fair queuing, fixed priority, and hybrid schemes
- Supports MPLS, Segment Routing, MLAG, ECMP, and EVPN-VXLAN via Arista EOS
- 100% internally lossless switching at full 576 x 400GbE system scale
- As low as 25W per 400G port — industry-leading power efficiency
- Onboard CPU for local processing and enhanced manageability
- System-wide hardware and software health monitoring for continuous operations
- Consistent architecture with 7800R3 Series for seamless chassis migration

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

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

View full details

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- 36 x 400GbE QSFP-DD ports per line card
- Up to 28.8 Tbps full-duplex bandwidth per line card
- Each port supports 400G native or 4x 100G breakout mode
- Enhanced MACsec (Enh MACsec) — IEEE 802.1AE, AES-256-GCM encryption
- TunnelSec: MACsec (L2), IPsec (RFC 4303), and VXLANsec
- Onboard CPU for local processing and management
- Deep buffer VOQ architecture — ~40 ms traffic buffer per ingress port
- Non-blocking fabric connectivity to all fabric modules
- FlexRoute Engine — Internet-scale routing table in hardware
- Algorithmic ACLs — flexible pattern matching for ACL, PBF, and telemetry
- Accelerated sFlow at 400G with no forwarding impact
- As low as 25W per 400G port
- Compatible chassis: 7804R (4-slot, 10RU), 7808R (8-slot, 16RU), 7812R (12-slot, 23RU), 7816R (16-slot, 31RU)
- Supports AC and DC power options (chassis-dependent)
- Ships installed in chassis

FAQs

Q: What chassis is the DCS-7800R3A-36DM2-LC compatible with?
A: This line card is compatible with all Arista 7800R Series modular chassis: the 7804R (4-slot, 10RU), 7808R (8-slot, 16RU), 7812R (12-slot, 23RU), and 7816R (16-slot, 31RU). It shares a consistent architecture with the broader 7800R3 Series, enabling seamless migration and mixed-slot deployment.

Q: Does the Enhanced MACsec on this line card impact forwarding performance?
A: No. The DCS-7800R3A-36DM2-LC delivers wire-speed, line-rate AES-256-GCM encryption across all 36 ports simultaneously with zero forwarding penalty. TunnelSec supports MACsec (L2), IPsec (RFC 4303), and VXLANsec for encrypted WAN and DCI tunnels over third-party infrastructure.

Q: Is a software licence required to enable encryption features?
A: Yes. MACsec, IPsec, and VXLANsec encryption services are EOS licensed features and require the appropriate Arista EOS licence to activate. Contact IP Trading for licence procurement and guidance.

Q: What is the total system bandwidth when fully populated?
A: At maximum system scale, the Arista 7800R Series supports up to 576 x 400GbE ports. The cell-based fabric architecture ensures 100% internally lossless and fair switching even at this density, with no head-of-line blocking thanks to the deep-buffer VOQ design.

Q: Can I purchase this line card in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller offering the DCS-7800R3A-36DM2-LC with competitive pricing and local support. Our team can assist with compatibility checks, chassis configuration, and volume orders.

Q: What routing and virtualisation protocols does this line card support?
A: The line card supports MPLS, Segment Routing, MLAG, ECMP, EVPN-VXLAN, and full Internet routing table scale via the FlexRoute Engine — all managed through Arista EOS for consistent, programmable network operations.

Datasheet

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