• Silver-colored arista dcs-7800r3ak-36dm-lc rack-mounted network switches with 36-port 400g line card and ventilation slots
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Arista

Arista DCS-7800R3AK-36DM-LC | 7800R3 36-Port 400G Line Card, Large Routes, MACsec

DCS-7800R3AK-36DM-LC

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Description

The Arista DCS-7800R3AK-36DM-LC is a high-performance line card for 7800R3 Series modular data center switches, delivering 28.8 Tbps full-duplex throughput across 36x 400GbE QSFP-DD ports. Designed for large-scale cloud and service provider networks, it features FlexRoute support for over 5 million routes, enhanced MACsec encryption with AES-256-GCM, and flexible breakout options supporting 400G, 4x100G, or lower speeds per port. Ideal for spine-leaf architectures, data center interconnect, and high-density edge routing applications requiring advanced security and massive routing scale.

Features

Layer 2 features: VLANs (4094), IEEE 802.1Q tagging, 802.1ad Q-in-Q, LACP, MLAG multi-chassis aggregation
- Layer 3 routing: BGP, OSPF, IS-IS, static routing, ECMP, VRF-Lite, IPv4/IPv6 dual-stack
- VXLAN and EVPN support for network virtualization and multi-tenancy in cloud data centers
- Segment Routing (SR-MPLS and SRv6) for traffic engineering and service provider networks
- Hardware-accelerated sFlow sampling at full forwarding rate with selective filtering
- Algorithmic ACLs for high-scale access control, policy-based routing, and traffic classification
- Advanced QoS with 8 queues per port, weighted fair queuing, strict priority, and WRED
- Precision Time Protocol (PTP) IEEE 1588v2 for time synchronization in distributed systems
- Zero Touch Provisioning (ZTP) and CloudVision integration for automated deployment
- Virtual Output Queuing (VOQ) architecture eliminates congestion and ensures wire-speed performance
- Line-rate AES-256-GCM encryption across all ports at 400G without performance penalty
- Hot-swappable design with graceful insertion/removal and automated fabric rebalancing

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 400GbE QSFP-DD ports with support for 400G, 4x100G, 2x200G, or 8x50G breakout
- Line card throughput: 28.8 Tbps full-duplex (14.4 Tbps transmit + 14.4 Tbps receive)
- FlexRoute engine supports over 5 million IPv4/IPv6 routes with large-scale routing table
- Enhanced MACsec encryption using AES-256-GCM block cipher at line rate (IEEE 802.1AE)
- TunnelSec support: MACsec, IPsec (RFC 4303), and VXLANsec for Layer 2/3 encryption
- Deep buffer VOQ architecture for lossless forwarding and zero head-of-line blocking
- Compatible with Arista 7804R, 7808R, 7812R, and 7816R chassis (requires EOS)
- Hot-swappable installation with redundant fabric module connectivity
- Advanced sFlow and IPFIX telemetry with algorithmic ACLs for traffic visibility
- Operating temperature: 0°C to 40°C; humidity: 5% to 85% non-condensing

FAQs

Q: What chassis models support the DCS-7800R3AK-36DM-LC line card?
A: This line card is compatible with all Arista 7800R3 Series modular chassis including the 7804R (4-slot), 7808R (8-slot), 7812R (12-slot), and 7816R (16-slot) systems. It requires an Arista 7800-SUP1A supervisor module running Arista EOS and at least six fabric modules for full throughput.

Q: What is the difference between the 7800R3AK and standard 7800R3A line cards?
A: The 7800R3AK variant features FlexRoute support for over 5 million routes, significantly exceeding standard line cards for large-scale internet routing and service provider applications. Both support enhanced MACsec encryption, but the AK series is optimized for maximum routing table capacity and internet-scale BGP deployments.

Q: Does this line card require special licenses for encryption features?
A: Yes, encryption services including MACsec, IPsec, and VXLANsec are EOS licensed features. You need to purchase the Enhanced Security Encryption License for your specific chassis slot count (4-slot, 8-slot, 12-slot, or 16-slot) to enable TunnelSec functionality on encryption-capable line cards.

Q: Can I mix this line card with other 7800R3 Series line cards?
A: Yes, all 7800R3 and 7800R3A Series line cards are fully interoperable within the same chassis. You can mix 100G, 400G, standard, and large-route variants. The modular fabric architecture ensures non-blocking performance regardless of line card mix, with consistent forwarding behavior across all slots.

Q: What optics and cables are supported on the QSFP-DD ports?
A: The QSFP-DD ports support a wide range of 400G optics including 400GBASE-DR4, FR4, LR4, and LR8 modules, plus passive and active DAC/AOC cables. Each port also supports breakout to 4x100G QSFP28, 2x200G, or 8x50G configurations using appropriate optics and EOS configuration. Check Arista's transceiver compatibility matrix for specific module support.

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