• Silver-colored Arista DCS-7800R3A-36PM-LC rack-mounted network switches with 36 ports and macsec encryption features
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Arista

Arista DCS-7800R3A-36PM-LC | 7800R3A 36-Port 400GbE Line Card, MACsec Encryption

DCS-7800R3A-36PM-LC

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Description

The Arista DCS-7800R3A-36PM-LC is a high-performance modular line card designed for data center spine and core deployments. It delivers 36 ports of 400GbE OSFP connectivity with 28.8 Tbps full-duplex bandwidth and integrated Enhanced MACsec encryption capabilities for secure layer 2 traffic protection. Ideal for large-scale cloud networks, internet peering, and data center interconnect applications requiring wire-speed encryption and flexible routing scalability.

Features

36 x 400GbE OSFP ports with multi-rate support (10G to 400G)
- 28.8 Tbps full-duplex switching capacity per line card
- Enhanced MACsec (IEEE 802.1AE) with line-rate AES-256-GCM encryption
- FlexRoute engine for internet-scale routing and flexible table allocation
- Deep buffer Virtual Output Queue (VOQ) architecture for lossless forwarding
- Accelerated sFlow for wire-speed traffic visibility and telemetry
- Algorithmic ACLs for high-scale access control and policy-based forwarding
- Layer 2 and Layer 3 forwarding with comprehensive protocol support
- VXLAN and EVPN overlay network support
- MPLS and Segment Routing for WAN and service provider deployments
- Non-blocking fabric connectivity with active/active fabric module utilization
- Hot-swappable design for continuous operations and high availability
- Interoperability with all 7800R3 and 7800R3A Series line cards

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: 36 x 400GbE OSFP ports
- Bandwidth: 28.8 Tbps full-duplex per line card
- Port Speed Support: 400G, 200G, 100G, 50G, 40G, 25G, 10G per port with breakout capability
- Encryption: Enhanced MACsec (IEEE 802.1AE) with AES-256-GCM line-rate encryption
- Buffer Memory: Deep buffer Virtual Output Queue (VOQ) architecture, approximately 40 msec per ingress port
- Routing Scale: FlexRoute engine with internet-scale routing support
- Compatible Chassis: Arista 7804R, 7808R, 7812R, 7816R Series modular switches
- Form Factor: Modular line card (spare unit)
- Advanced Features: Accelerated sFlow, Algorithmic ACLs, VXLAN, EVPN, MPLS, Segment Routing
- Architecture: Non-blocking, lossless fabric with HOL blocking elimination

FAQs

Q: What is the difference between the DCS-7800R3A-36PM-LC and DCS-7800R3A-36P-LC?
A: The DCS-7800R3A-36PM-LC includes Enhanced MACsec encryption capabilities for line-rate, hardware-based AES-256-GCM encryption on all ports, while the DCS-7800R3A-36P-LC is the standard version without MACsec. Both support 36 x 400GbE OSFP ports and identical bandwidth.

Q: Does this line card require a separate encryption license to enable MACsec?
A: Yes, MACsec encryption is an EOS licensed feature. You will need to purchase an Enhanced Security Encryption License for the specific chassis model (4-slot, 8-slot, 12-slot, or 16-slot) to activate TunnelSec and MACsec encryption features on the line card.

Q: Which Arista chassis is this line card compatible with?
A: The DCS-7800R3A-36PM-LC is compatible with all Arista 7800R Series modular chassis: the 7804R (4-slot), 7808R (8-slot), 7812R (12-slot), and 7816R (16-slot). It interoperates seamlessly with other 7800R3 and 7800R3A Series line cards in the same chassis.

Q: What port breakout options are supported on this line card?
A: Each 400GbE OSFP port supports flexible breakout configurations including 4x100G, 8x50G, 2x200G, and lower speeds down to 10G, subject to compatible transceivers and EOS software support. This provides deployment flexibility for mixed-speed environments.

Q: Is this a spare line card or does it ship pre-installed in a chassis?
A: The DCS-7800R3A-36PM-LC is designated as a spare line card for field installation or expansion. The part number ending with '#' (DCS-7800R3A-36PM-LC#) indicates a version that ships pre-installed in a chassis configuration.

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