• Silver-colored arista dcs-7800r3k-48cq-lc rack-mounted network switches with 48 ports and ventilation slots
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Arista

Arista DCS-7800R3K-48CQ-LC | 7800R3 48-Port 100G QSFP Line Card, 5M Routes

DCS-7800R3K-48CQ-LC

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Description

The Arista DCS-7800R3K-48CQ-LC is a high-performance line card for the 7800R3 Series modular data center chassis, delivering 48 ports of wirespeed 100GbE QSFP connectivity with 4.8 Tbps throughput and 2 Bpps forwarding capacity. Designed for large-scale virtualized data centers, internet peering, and cloud networks, this module features FlexRoute scaling to over 5 million IP routes, making it ideal for internet-scale routing deployments. The large-table architecture with 8GB buffer and virtual output queuing ensures lossless forwarding, low latency, and exceptional performance for demanding Layer 2 and Layer 3 spine and leaf architectures.

Features

FlexRoute engine with support for over 5 million IPv4 and IPv6 routes in hardware
- Virtual Output Queuing (VOQ) architecture eliminates head-of-line blocking and packet loss
- Wirespeed Layer 2 and Layer 3 switching with deterministic low latency
- Full support for EVPN-VXLAN, MPLS, and Segment Routing protocols
- Algorithmic ACLs for flexible access control and policy-based forwarding
- Accelerated sFlow and IPFIX for real-time network analytics at line rate
- Dynamic load balancing across fabric modules with hash polarization mitigation
- Comprehensive Layer 2 features: VLANs, STP, MLAG, LACP
- Advanced Layer 3 routing: BGP, OSPF, IS-IS, ECMP, VRF
- QoS and traffic shaping with weighted fair queuing and strict priority
- IPv4 and IPv6 dual-stack support with full feature parity
- Non-blocking architecture with full-mesh connectivity to fabric modules
- Hitless speed configuration changes without port disruption
- Arista EOS software with zero-touch provisioning and CloudVision integration
- Hot-swappable module for continuous operation and serviceability

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

48 x 100GbE QSFP ports
- Port breakout support: up to 96 x 50G or 96 x 25G (transceiver dependent)
- Throughput: 4.8 Tbps full-duplex
- Forwarding rate: 2 billion packets per second (Bpps)
- FlexRoute engine: supports over 5 million IP routes (IPv4/IPv6)
- Packet buffer: 8GB total, with deep buffer virtual output queuing (VOQ)
- Switching architecture: Single-stage Jericho2 ASIC with wirespeed performance
- Chassis compatibility: Arista 7804 and 7808 modular chassis
- Management: Arista EOS (Extensible Operating System), CLI, REST API, SNMP, sFlow, IPFIX
- Hot-swappable line card module
- Dimensions (W x H x D): 18.9" x 2.1" x 17.8" (48.1 x 5.4 x 45.2 cm)
- Weight: Approximately 20 lbs (9.1 kg)
- Typical power consumption: 620W (50% load at 25°C, excludes optics)
- Maximum power consumption: 684W

FAQs

Q: What is the difference between the DCS-7800R3K-48CQ-LC and the standard DCS-7800R3-48CQ-LC?
A: The DCS-7800R3K-48CQ-LC is the Large Table variant, supporting over 5 million IP routes compared to the standard version's lower routing table capacity. This makes the K variant ideal for internet peering, carrier edge, and large-scale WAN deployments requiring internet-scale routing tables.

Q: Which Arista chassis models are compatible with this line card?
A: The DCS-7800R3K-48CQ-LC is compatible with Arista 7800R3 Series modular chassis, including the DCS-7804 (4-slot) and DCS-7808 (8-slot) systems. It requires a compatible supervisor module and fabric modules for operation.

Q: Can the 100G ports be broken out into lower-speed interfaces?
A: Yes, each 100GbE QSFP port can be broken out into multiple lower-speed interfaces (such as 2 x 50G or 4 x 25G) depending on the transceiver or cable used. This provides deployment flexibility for mixed-speed data center environments.

Q: Does this line card support MACsec encryption?
A: No, the DCS-7800R3K-48CQ-LC does not include MACsec encryption capabilities. For MACsec support, consider the DCS-7800R3-48CQM-LC or DCS-7800R3-48CQM2-LC variants which offer wirespeed encryption features.

Q: What deployment scenarios is this line card best suited for?
A: This line card is optimized for large-scale data center spine architectures, internet peering points, carrier edge deployments, cloud service provider networks, and any environment requiring high-density 100G connectivity with internet-scale routing capabilities and ultra-low latency.

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