• Silver-colored arista dcs-7800r3k-72y-lc rack-mounted network switches with 72 25g sfp28 ports and ventilation slots
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Arista

Arista DCS-7800R3K-72Y-LC | 7800R3 72-Port 25G SFP28 Line Card, FlexRoute 5M Routes

DCS-7800R3K-72Y-LC

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Description

The Arista DCS-7800R3K-72Y-LC is a high-density 72-port 25GbE SFP28 wirespeed line card for the 7800R3 Series modular chassis. Designed for data center spine, internet peering, and carrier edge deployments, it features FlexRoute technology supporting over 5 million IPv4/IPv6 routes in hardware. This K-series module delivers wire-speed forwarding with deep packet buffering, virtual output queuing architecture, and support for advanced features including Algorithmic ACLs and Accelerated sFlow.

Features

FlexRoute engine with algorithmic forwarding for internet-scale routing (5M+ routes)
- Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- Deep packet buffering (24GB) provides 50ms buffer per ingress port
- Wire-speed Layer 2 and Layer 3 forwarding with MPLS, Segment Routing, SR-MPLS
- Algorithmic ACLs with up to 100K entries for flexible policy control
- Accelerated sFlow for high-rate network telemetry without performance impact
- Advanced EVPN support: EVPN-VXLAN, EVPN-MPLS, EVPN-VPWS, EVPN-DCI
- Comprehensive QoS with hierarchical queuing, ingress policing, and flexible classification
- MLAG, ECMP, and UCMP for high availability and load balancing
- Precision Time Protocol (PTP) for accurate time synchronization
- Non-blocking fabric with 100% efficient connectivity and dynamic load balancing
- Comprehensive network monitoring with up to 16 traffic classifications per flow
- IPv4 and IPv6 routing with BGP, OSPF, IS-IS, multicast (PIM, IGMP, MLD)
- Hot-swappable design for continuous operations and serviceability
- Compatible with all 7800R3 and 7800R3A series line cards for flexible chassis population

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

72 x 25GbE SFP28 ports (wire-speed)
- Line card throughput: 3.6 Tbps full duplex
- Forwarding capacity: Up to 2.7 billion packets per second per line card
- FlexRoute engine: Supports over 5 million IPv4/IPv6 routes in hardware
- Packet buffer memory: Up to 24GB per line card with deep buffering (50ms per port)
- Virtual Output Queue (VOQ) architecture for lossless forwarding
- Non-blocking full-mesh fabric connectivity
- Algorithmic ACLs: Up to 100K entries per forwarding engine
- Accelerated sFlow support for wire-speed telemetry
- Compatible with 7804R, 7808R, 7812R, and 7816R chassis
- Hot-swappable line card module
- Arista EOS operating system support
- Layer 2 and Layer 3 forwarding with MPLS, Segment Routing, VXLAN
- Advanced features: EVPN, MLAG, ECMP, PTP, QoS
- Form factor: Modular line card for 7800R3 Series chassis

FAQs

Q: Which Arista chassis models support the DCS-7800R3K-72Y-LC line card?
A: This line card is compatible with all Arista 7800R3 Series chassis including the 7804R (4-slot), 7808R (8-slot), 7812R (12-slot), and 7816R (16-slot) models. It can be mixed with other 7800R3 and 7800R3A series line cards in the same chassis.

Q: What makes the R3K variant different from standard 7800R3 line cards?
A: The R3K designation indicates large-scale routing support through Arista's FlexRoute technology, enabling the line card to support over 5 million IPv4/IPv6 routes in hardware. This makes it ideal for internet peering, carrier edge, and large-scale data center spine deployments requiring full internet routing table support.

Q: Can the 25GbE ports be broken out to lower speeds?
A: Yes, the SFP28 ports support flexible speed operation including 1GbE, 10GbE, and 25GbE depending on the transceiver used. This provides deployment flexibility for migration scenarios and mixed-speed environments.

Q: What are the key use cases for this high-density 25G line card?
A: Primary use cases include data center spine-leaf architectures requiring high port density, internet service provider edge and peering applications with large routing tables, carrier-grade networks needing advanced MPLS features, and high-performance server connectivity in hyperscale environments.

Q: Does this line card require any specific software licensing?
A: The line card operates with Arista EOS software. Advanced features like FlexRoute, EVPN, VXLAN, and Segment Routing are available through EOS software subscriptions. Contact your Arista representative for specific licensing requirements based on your deployment needs.

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