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Designing and Operating Arista Leaf-Spine Fabrics
By Russell Hughes | 50 Min Video
Leaf-spine is the standard data center architecture, but designing a fabric that scales cleanly and operating it reliably requires careful planning and strong Day-2 practices.
This Tech Talk focuses on the real-world design decisions and operational challenges of Arista leaf-spine fabrics. We cover underlay vs. overlay concepts, common Arista design options (L2 vs. L3 leaf, EVPN/VXLAN at a practical level), oversubscription and failure-domain planning, and the most common pitfalls seen in production environments.
What you’ll walk away with:
- A clearer understanding of Arista leaf-spine design tradeoffs
- The ability to spot design and operational risks earlier
- Practical guidance for improving Day-2 operations and visibility
- Better readiness for future scale and next-generation workloads
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Key Insights
- BGP is the most scalable and preferred routing protocol for both underlay and overlay in VXLAN EVPN fabrics.
- VXLAN encapsulation extends Layer 2 domains over a Layer 3 underlay, avoiding spanning tree issues and enabling ECMP.
- EVPN handles control plane functions, including MAC learning, flood list creation, and IP prefix advertisement for integrated routing.
- Integrated Routing and Bridging enables flexible routing between VLANs with options suited for different deployment needs.
- EVPN’s ARP suppression reduces broadcast traffic, improving efficiency in large-scale deployments.
Instructor Bio:
Russell has over 25 years of experience in the field of networking and 20 years as an instructor. He has delivered courses for SLI, formerly CCTI, for fourteen years, specializing in security, content networking, and Voice over IP solutions. Russell started his career in the IT industry as a systems administrator, where he was in charge of daily maintenance of Windows servers, backup solutions, and e-mail. He helped design and build a remote classroom lab solution that allowed CCTI/SLI to deliver Cisco courses anywhere in the world without the need to ship Cisco equipment. Russell currently teaches CCNA and CCNP level courses, with expertise in content networking, IPv6, BGP, and Data Center areas.