• Gray metal back server rack of arista dcs-7800r3ak-36dm2-lc 7800r3 36-port 400gbe line card with black ventilation slots
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Arista

Arista DCS-7800R3AK-36DM2-LC | 7800R3 36-Port 400GbE Line Card, Enhanced MACsec

DCS-7800R3AK-36DM2-LC

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Description

The Arista DCS-7800R3AK-36DM2-LC is a high-performance modular line card for the 7800R3 Series chassis, delivering 36 ports of 400GbE QSFP-DD connectivity with enhanced MACsec encryption and integrated CPU. Designed for large-scale data centers and cloud networks, it supports FlexRoute technology scaling to over 5 million routes, making it ideal for internet peering, data center interconnect, and spine deployments. The 7800R3AK variant provides large-scale routing capabilities with TunnelSec encryption support for MACsec, IPsec, and VXLANsec.

Features

FlexRoute Engine with support for over 5 million IPv4/IPv6 routes using algorithmic LPM
- TunnelSec encryption: IEEE 802.1AE MACsec, IPsec (RFC 4303), and VXLANsec at line rate
- AES-256-GCM authenticated encryption with no performance penalty from 10G to 400G
- Deep buffer VOQ architecture eliminating head-of-line blocking, 100% fabric efficiency
- Accelerated sFlow for line-rate traffic sampling and visibility
- Algorithmic ACLs for flexible pattern matching and high-scale access control
- Comprehensive L2/L3 feature set: MLAG, ECMP, VXLAN, EVPN, MPLS, Segment Routing
- Non-blocking fabric connectivity with hot-swappable design
- Support for 400G-ZR/ZR+ coherent optics for metro DWDM applications
- Integrated CPU for distributed control plane and enhanced processing
- Advanced QoS with weighted fair queuing, strict priority, and hierarchical scheduling
- Flexible forwarding profiles for spine, leaf, internet peering, and carrier edge roles
- Support for precision timing (PTP, SyncE) and network telemetry
- Compatible with Arista CloudVision for unified network management and analytics

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
- Per-Port Speeds: 400G, 4x 100G, 8x 50G, 8x 25G, 4x 40G (via breakout)
- Line Card Throughput: 28.8 Tbps full duplex
- Routing Scale: Over 5 million routes with FlexRoute Engine (large route variant)
- Buffer Architecture: Deep buffer VOQ (Virtual Output Queue) with ~40ms per ingress port
- Encryption: Enhanced MACsec (AES-256-GCM), TunnelSec with MACsec/IPsec/VXLANsec support
- CPU: Integrated onboard CPU (M2 variant)
- Forwarding: Line-rate L2/L3 forwarding, non-blocking
- Features: Accelerated sFlow, Algorithmic ACLs, MPLS, Segment Routing, VXLAN, EVPN
- Compatibility: 7800R3 Series chassis (7804R, 7808R, 7812R, 7816R)
- Operating System: Arista EOS
- Form Factor: Modular line card (hot-swappable)

FAQs

Q: What chassis models are compatible with the DCS-7800R3AK-36DM2-LC?
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/7816LR (16-slot) systems. It interoperates with all other 7800R3 and 7800R3A series line cards.

Q: What makes the 7800R3AK variant different from standard 7800R3A line cards?
A: The 7800R3AK variant includes Arista's FlexRoute technology with large-scale routing support, scaling to over 5 million IPv4 and IPv6 routes. This makes it ideal for internet peering, service provider edge, and carrier-grade routing applications where internet-scale routing tables are required.

Q: Does this line card require a license for encryption features?
A: Yes, TunnelSec encryption services (MACsec, IPsec, VXLANsec) are EOS licensed features and require an Enhanced Security Encryption License specific to your chassis slot count (4-slot, 8-slot, 12-slot, or 16-slot modular systems).

Q: What is the difference between the M2 and DM2 variants?
A: The DM2 variant (this model) combines both enhanced MACsec encryption capabilities with an integrated CPU, while also supporting large routing tables (indicated by the K in R3AK). The M2 designation indicates the onboard CPU for distributed control plane processing.

Q: Can this line card support breakout configurations?
A: Yes, each 400G QSFP-DD port can be broken out into 4x 100G, 8x 50G, or 8x 25G connections using appropriate breakout cables and transceivers, providing flexible deployment options for various network topologies.

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