• Silver-colored Arista DCS-7800R3K-36DM-LC rack-mounted network switches with 36-port 400G QSFP-DD line card and ventilation slots
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Arista

Arista DCS-7800R3K-36DM-LC | 7800R3 36-Port 400G QSFP-DD Line Card, MACsec, 5M Routes

DCS-7800R3K-36DM-LC

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Description

The Arista DCS-7800R3K-36DM-LC is a modular line card for the Arista 7800R3 Series chassis, built for large-scale data centre spine and core roles, Internet peering, secure data centre interconnect, cloud and carrier edge routing, and AI cluster fabrics that need deep buffers and wire-speed 400G.

It provides 36 QSFP-DD ports running 400GbE at wire speed, with breakout to as many as 144 x 100G or 288 x 10G/25G/50G interfaces. Throughput is 14.4 Tbps (28.8 Tbps full duplex), backed by 24 GB of packet buffer. MACsec encryption is available on all ports, and the large-scale FlexRoute tables of the 7800R3K variant support over 5M routes. Typical power draw is 825 W, with a 1136 W maximum, excluding optics.

The card installs in the DCS-7816L, DCS-7816, DCS-7812, DCS-7808 and DCS-7804 chassis, alongside the matching fabric modules, and interoperates with other 7800R3 and 7800R3A line cards. It runs Arista EOS, with feature licences for routing and advanced functions ordered separately with the chassis and software.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Fully scheduled lossless architecture with cell-spraying fabric, Virtual Output Queuing and distributed credit scheduling
- 24 GB deep packet buffer for in-cast and burst handling
- MACsec (IEEE 802.1AE) encryption on all ports
- FlexRoute for Internet-scale routing, supporting over 5M routes on the 7800R3K line cards
- Independent speed and breakout configuration per port
- Algorithmic ACLs for pattern matching, policy-based forwarding and telemetry
- LANZ microburst detection, ZTP, IEEE 1588 PTP and CloudVision integration
- Runs Arista EOS with open APIs (JSON-RPC, NETCONF)

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

- Model: 7800R3K-36DM
- Ports: 36x QSFP-DD
- Max 400G interfaces: 36
- Max 100G interfaces: 144
- Max 50G interfaces: 288
- Max 25G interfaces: 288
- Max 10G interfaces: 288
- Max 40G (using QSFP+): 36
- Max total interfaces: 288
- Throughput: 14.4 Tbps (28.8 Tbps FDX)
- Forwarding: up to 6 Bpps per line card
- System latency: under 4 microseconds (64 bytes)
- Encryption: MACsec on all ports
- Port buffer: 24 GB
- Routing scale: large-scale FlexRoute, over 5M routes
- Typical power: 825 W (1136 W maximum, excluding optics)
- Dimensions (W x H x D): 48.1 x 5.4 x 45.2 cm (18.9 x 2.1 x 17.8 in)
- Weight: 10 kg (22 lbs)
- Chassis support: DCS-7816L, DCS-7816, DCS-7812, DCS-7808, DCS-7804

FAQs

Q: Which chassis does this line card install in?
A: It installs in the Arista 7800R3 chassis DCS-7816L, DCS-7816, DCS-7812, DCS-7808 and DCS-7804. The matching fabric modules for the chosen chassis are also required.

Q: Does it need a separate licence?
A: It runs Arista EOS and no per-line-card licence is specified. Feature licences for routing and advanced features are ordered separately with the chassis and software.

Q: How many routes does it support?
A: As a 7800R3K model it uses large-scale FlexRoute tables that support over 5M routes, suited to Internet peering and core routing.

Q: Can the 400G ports run at lower speeds?
A: Yes. Using breakout optics or cables, the 36 QSFP-DD ports provide up to 144 x 100G or 288 x 10G/25G/50G interfaces, and speed and breakout modes are set independently per port.

Q: How much power does the line card draw?
A: Typical draw is 825 W and the maximum is 1136 W, excluding optics. It is powered through the chassis grid-redundant power supplies.

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