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Leaf-and-Spine Fabric Architectures

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The Leaf-and-Spine Fabric Architectures webinar describes the leaf-and-spine (Clos fabric) concepts, architecture, and single- and multistage designs that can be used to build large layer-2 or layer-3 all-point-equidistant Data Center networks.

Last modified on 2025-01-02 (release notes)

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Leaf-and-Spine Fabric Architectures

1:24:47 Free items Introduction

Traditional data center networks used a 3-tier design that was mostly mandated by hardware limitations, resulting in unequal bandwidth between endpoints based on their locations. In the last few years the networking industry rediscovered the work of Charles Clos (from 1953) and everyone started promoting leaf-and-spine fabrics.

45:54 Free items Physical Fabric Design

After mastering the basic principles of leaf-and-spine fabrics described in the Introduction section we're moving on to the physical design: how do you build a leaf-and-spine fabric given number of edge ports and oversubscription ratio? What if you need less than 100 ports? What if you need 50.000 ports? What do you do if you have to support low-speed edge interfaces?

2:39:15 Free items Layer-3 Fabrics with Non-Redundant Server Connectivity

We're starting the design part of the webinar with the simplest possible scenario – each leaf switch is a single IP subnet – and focus on routing protocol selection, route summarization, leaf-to-spine link aggregation, and core link addressing.

The second half of this section describes detailed guidelines on using BGP and OSPF as the underlay routing protocols in a leaf-and-spine fabric.

1:06:44 Layer-3 Fabrics with Redundant Server Connectivity

After establishing the baseline in the Layer-3 fabrics with non-redundant server connectivity section we'll add complexity at the fabric edge: redundantly connected servers.

31:15 Free items Layer-3-Only Data Centers

Is it possible to build a pure layer-3 data center fabric that supports redundant server connectivity and IP address mobility? You'll find out in this section.

36:40 Free items Routing on Servers

Another approach to building a pure layer-3 fabric is to extend the fabric routing protocol into the servers and announce servers' loopback IP addresses using BGP.

1:53:15 Free items Layer-2 Fabrics

We're leaving the stable world of L3-only fabrics and entering the realm of large VLANs that most enterprise data centers have to deal with. We'll cover numerous design scenarios, from traditional bridging to routing on layer 2 and MAC-over-IP encapsulation.

1:53:31 Free items Mixed Layer-2 + Layer-3 Fabrics

Most data center fabrics have to combine elements of large VLANs and routing. In this section we'll explore the various combinations, from traditional routing on spine switches to anycast routing on leaf switches.

2:16:42 Free items Multi-Pod and Multi-Site Fabrics

Should you stretch a single fabric across multiple sites? Does it make sense to split a large fabric into smaller fabrics (pods)? What could you do to improve the scalability of VXLAN-based EVPN fabrics?

This section contains the design guidelines and technology details you need to answer these questions.

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