# EVPN Designs: EVPN EBGP over IPv4 EBGP

DevFeed: [EVPN Designs: EVPN EBGP over IPv4 EBGP](<https://devfeed.tech/articles/evpn-designs-evpn-ebgp-over-ipv4-ebgp-11081.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2024/10/evpn-designs-ebgp-ebgp/>)

Published: 2024-10-29T06:12:00Z

Content type: opinion

Language: en

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

Topics: [evpn](<https://devfeed.tech/topics/evpn.md>), [networking](<https://devfeed.tech/topics/networking.md>)

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

## AI overview

The article compares EVPN designs and discusses why an EBGP-over-EBGP approach might be recommended. It argues that IBGP-based EVPN keeps sessions stable through many core-link failures, while EBGP-only EVPN can require a full EVPN route exchange after a failed link is restored.

## Source excerpt

In the previous blog posts, we explored three fundamental EVPN designs: we don't need EVPN, IBGP EVPN AF over IGP-advertised loopbacks (the way EVPN was designed to be used) and EBGP-only EVPN (running the EVPN AF in parallel with the IPv4 AF). Now we're entering Wonderland: the somewhat unusual1 things vendors do to make their existing stuff work while also pretending to look cool2. We'll start with EBGP-over-EBGP, and to understand why someone would want to do something like that, we have to go back to the basics. Read more ...