# EVPN Designs: IBGP Full Mesh Between Leaf Switches

DevFeed: [EVPN Designs: IBGP Full Mesh Between Leaf Switches](<https://devfeed.tech/articles/evpn-designs-ibgp-full-mesh-between-leaf-switches-11002.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2024/05/evpn-designs-ibgp-full-mesh/>)

Published: 2024-05-23T06:52:00Z

Content type: tutorial

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [evpn](<https://devfeed.tech/topics/evpn.md>), [BGP](<https://devfeed.tech/topics/bgp.md>), [VXLAN](<https://devfeed.tech/topics/vxlan.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>)

Tags: [bgp](<https://devfeed.tech/tags/bgp.md>), [design](<https://devfeed.tech/tags/design.md>), [evpn](<https://devfeed.tech/tags/evpn.md>), [evpn-designs](<https://devfeed.tech/tags/evpn-designs.md>), [github](<https://devfeed.tech/tags/github.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [vxlan](<https://devfeed.tech/tags/vxlan.md>)

## AI overview

This tutorial builds an EVPN control plane for a VXLAN leaf-and-spine fabric using a full mesh of IBGP sessions between leaf switches. It explains the lab setup with netlab, the required BGP and EVPN configuration changes, and relevant Arista EOS settings. The article notes that a full leaf-to-leaf mesh is best suited to tiny fabrics or small-scale EVPN pilots.

## Source excerpt

In the previous blog post in the EVPN Designs series, we explored the simplest possible VXLAN-based fabric design: static ingress replication without any L2VPN control plane. This time, we'll add the simplest possible EVPN control plane: a full mesh of IBGP sessions between the leaf switches. This blog post describes an initial BGP design that we'll refine in subsequent blog posts. Having a full mesh of IBGP sessions between leaf switches might be a bad idea unless you have a tiny fabric or you're deploying a small-scale EVPN pilot. Read more ...