EVPN-VXLAN & Data Centre Networking

Modern data centre fabric architecture — scalable, resilient, and operationally elegant. Built for the demands of today and the growth plans of tomorrow.

The Data Centre Fabric Is the Foundation Everything Else Sits On.

Legacy three-tier data centre architectures — core, distribution, access — were designed for a world of north-south traffic, physical servers, and relatively static workloads. That world is gone. Modern data centres run containerised workloads, virtualised infrastructure, and east-west traffic patterns that a traditional spanning-tree-based architecture handles poorly, if at all.

EVPN-VXLAN with a spine-leaf topology is the architecture that replaced it — and for good reason. Layer 2 extension over a layer 3 fabric. Multi-tenancy without physical segmentation. ECMP load balancing across every path in the fabric. Distributed anycast gateways. Operational simplicity at scale. It solves the problems that plagued legacy data centre designs and does so in a way that’s genuinely elegant.

At AMROTS, we design and deploy EVPN-VXLAN fabrics on Juniper QFX and Arista EOS platforms — building data centre networks that are high-availability by design, operationally simple to run, and built to scale without re-architecture.

Spine-leaf fabric design using EVPN-VXLAN for modern, scalable data centre networking

Juniper QFX and Arista EOS platform expertise — two of the leading data centre switching platforms

Layer 2 and layer 3 overlay design — VNI mapping, VRF design, and distributed anycast gateway

BGP underlay and overlay design — iBGP or eBGP fabric routing with full redundancy

Multi-tenancy and network segmentation using Segment Routing (SR), EVPN VRFs and L2/L3 VNIs

High-availability design — MLAG, ESI-LAG, and dual-homed server connectivity

Data centre interconnect (DCI) design for multi-site and hybrid cloud environments

Migration from legacy three-tier and spanning-tree architectures to modern spine-leaf fabrics

Design My Data Centre Fabric

24/7 Support: +374 00 000 000

Why Modern Data Centres Run EVPN-VXLAN.

EVPN-VXLAN isn’t just a technology trend — it’s a genuine architectural improvement over everything that came before it. Understanding why it’s become the standard for modern data centre fabric design helps explain why we recommend it so consistently.

Spine-Leaf Topology

A spine-leaf fabric replaces the traditional three-tier hierarchy with a two-tier architecture where every leaf switch connects to every spine switch — and traffic between any two servers in the fabric traverses exactly two hops. Equal-cost multipath (ECMP) load balancing across all spine links means no more spanning tree, no blocked ports, and consistent, predictable latency regardless of where traffic originates.

EVPN-VXLAN Overlay Design

The overlay is where the complexity lives — VNI allocation, VRF design, EVPN route type handling, ARP suppression, distributed anycast gateway configuration, and multi-tenancy. We design and implement EVPN-VXLAN overlays that are logically clean, well-documented, and operationally straightforward to manage day to day.

High-Availability Server Connectivity

Server connectivity in a spine-leaf fabric uses ESI-LAG (Ethernet Segment Identifier Link Aggregation) or MLAG to dual-home servers to two leaf switches — providing active/active redundancy at the host level. We design server connectivity that eliminates single points of failure at every tier of the fabric.

Data Centre Interconnec

For organisations operating multiple data centres or hybrid cloud environments, Data Centre Interconnect extends EVPN-VXLAN between sites — stretching layer 2 segments and layer 3 routing across physical facility boundaries. We design DCI solutions that maintain the operational consistency of a single fabric across geographically distributed infrastructure.

Juniper QFX & Arista EOS Specialists

Our data centre fabric work is predominantly on Juniper QFX and Arista EOS platforms — two of the most capable and widely deployed data centre switching platforms available. We know these platforms deeply, and the quality of the configurations we produce reflects that.

Migration, Not Just Greenfield

Most data centre fabric engagements aren't greenfield — they involve migrating from a legacy architecture to EVPN-VXLAN while keeping production workloads running. We plan and execute these migrations with the care and precision they demand, minimising risk and eliminating unplanned downtime.

Operationally Simple By Design

A fabric that's complex to operate is a liability. We design EVPN-VXLAN fabrics with operational simplicity in mind — clear VNI allocation schemes, consistent naming conventions, well-structured BGP policy, and documentation that makes the fabric understandable to whoever operates it after we leave.

Our design methodology

How We Design & Deploy Data Centre Fabrics

Through experienced startup consultants who understand the isolated tasks necessary, a client can rely on a professional to manage a critical step in the early stages and focus on other items that need attention.

Discovery & Requirements

Every data centre fabric engagement starts with a thorough understanding of your current environment and future requirements. We assess your existing switching infrastructure, server connectivity patterns, workload types, multi-tenancy requirements, and growth plans. For migration engagements, we document the existing architecture in detail — including all VLANs, port configurations, and connectivity dependencies — before designing the target state. The discovery phase is never rushed; the quality of the design depends entirely on the quality of the information we gather.

Fabric Design & Validation

With a clear picture of your requirements, we design the fabric — physical topology, BGP underlay, EVPN-VXLAN overlay, VNI allocation, VRF design, server connectivity, and high-availability architecture. Every design decision is documented with a clear rationale. For migration engagements, we produce a detailed cutover plan covering every step of the migration sequence, rollback procedures, and testing checkpoints. The design is reviewed internally and validated in a lab environment before any production changes are made.

Deployment & Handover

Fabric deployments — particularly migrations from legacy architectures — require methodical execution and a steady hand. We deploy in controlled stages, testing at each step before proceeding, with documented rollback procedures ready throughout. Post-deployment, we verify all workloads are operating correctly, test failover behaviour, and produce comprehensive as-built documentation. Knowledge transfer is provided to your operations team so they understand and can confidently operate everything we've built.

the process

Our Data Centre Fabric Engineering Process

Our Data Centre Fabric Engineering Process.

Discovery & Current State Assessment

We document your existing data centre infrastructure — physical topology, switching configuration, VLAN design, server connectivity, and workload patterns. For migration engagements, this step is critical: we need to understand every dependency before we can design a safe migration path.

Fabric Design & Cutover Planning

We design the target EVPN-VXLAN fabric — physical topology, BGP underlay, EVPN overlay, VNI allocation, VRF design, and server connectivity. For migration engagements, we produce a detailed cutover plan with step-by-step migration sequences, testing checkpoints, and rollback procedures at every stage.

Lab Validation & Staged Deployment

The fabric design is validated in a lab environment before production deployment. We deploy in controlled, documented stages — testing at each step and maintaining the ability to roll back if anything unexpected occurs. No single change is deployed without a verified rollback path.

Verification, Documentation & Handover

Post-deployment, we verify all workloads, test redundancy and failover behaviour, and produce comprehensive as-built documentation — physical topology, BGP configuration, EVPN overlay design, VNI allocation tables, and operational runbooks. Knowledge transfer sessions ensure your team can operate the fabric confidently.

Ready to Build a Data Centre Fabric That Actually Scales?

Whether you’re designing a new fabric from scratch or migrating from a legacy architecture — let’s talk about what your data centre needs.

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Yerevan, Armenia 0051

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Frequently Asked Questions

Some frequently asked questions about the service that you may have questions about

What is EVPN-VXLAN and why should I care?

EVPN-VXLAN is the combination of two technologies that together form the foundation of modern data centre networking. VXLAN provides a way to extend layer 2 networks across a layer 3 routed fabric — allowing workloads to be placed anywhere without being constrained by physical network topology. EVPN provides the BGP-based control plane that makes VXLAN scalable and operationally manageable. Together they enable the spine-leaf fabrics that power modern data centres — eliminating spanning tree, enabling ECMP load balancing, supporting multi-tenancy, and providing the operational visibility that legacy architectures lack.

Is EVPN-VXLAN suitable for smaller data centres?

Yes — while EVPN-VXLAN is used in some of the world's largest data centres, the architecture scales down as well as up. A small fabric with two spine switches and four leaf switches benefits from the same architectural properties as a large one — no spanning tree, ECMP load balancing, distributed anycast gateways, and clean multi-tenancy. The operational benefits are compelling regardless of scale.

Do you only work with Juniper and Arista?

Our primary data centre fabric expertise is on Juniper QFX and Arista EOS — the two platforms we work with most frequently and know most deeply. We also have experience with Cisco Nexus. If you're running a different platform, we'll have an honest conversation about whether we're the right fit or whether we should recommend someone with deeper experience on your specific hardware.

Can you migrate our existing data centre to EVPN-VXLAN without taking everything down?

s — live migration from a legacy architecture to EVPN-VXLAN is one of the most complex data centre projects you can undertake, and it's something we plan and execute with extreme care. The key is detailed discovery, a well-sequenced cutover plan, and disciplined execution with rollback procedures at every step. We've planned migrations of this type and know where the risk concentrates.

What documentation do you produce?

Every data centre fabric engagement produces comprehensive as-built documentation — physical topology diagrams, BGP underlay configuration, EVPN overlay design documentation, VNI allocation tables, VRF design rationale, server connectivity diagrams, and operational runbooks. The goal is that your operations team can fully understand and manage the fabric without needing to call us — though we're always available if they do.

Do you provide ongoing support after the fabric is deployed?

Yes — ongoing monitoring, operational support, and managed operations are available post-deployment. Many clients choose to retain us for ongoing management, particularly during the period immediately after a major migration when the team is still building familiarity with the new architecture.

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Amrots — Your network, engineered right.