Cloud Network Design Choices

Spline
Layer2 / MLAG
Layer3 / ECMP
L2 over Layer 3 VXLAN

The Universal Spine: DC Spine and Core Convergence

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Spline

SplineTM

The Arista Spline architecture attaches hosts directly to a pair of switches connected in an MLAG. This architecture can scale to more than 2000 hosts connected in a non-blocking manner. This large single tier enables densely deployed applications such as: IP and Ethernet storage, next generation file systems, distributed compute, and virtualization.

Layer2 / MLAG

Layer2 / MLAG

The L2LS network design is a two-tier architecture comprising of two spine switches and one or more Top-of-Rack (ToR) leaf switches. Leaf switches provide connectivity to storage, compute, service, and data center edge network elements. Leaf switches may be deployed by themselves or in a pairs for high availability. Spine switches aggregate and provide a fast backbone for the leaf switches.

Layer3 / ECMP

Layer3 / ECMP

The L3LS network design is a two-tier architecture comprising of 2-128 spine switches and one or more Top-of-Rack (ToR) leaf switches. Leaf switches provide connectivity to storage, compute, service, and data center edge network elements. Leaf switches may be deployed by themselves or in a pairs for high availability. Spine switches aggregate and provide a fast backbone for the leaf switches.

L2 over Layer 3 VXLAN

L2 over Layer 3 VXLAN

Leveraging the same two-tier architecture of the L3LS design, the Arista Networks L3LS-V Solution also incorporates Virtual eXtensible Local Area Network (VXLAN), an open IETF specification designed to standardize an overlay encapsulation protocol, capable of relaying Layer 2 traffic over IP networks.