Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

BGP Auto-Discovery Underlay for EVPN-VXLAN

BGP auto-discovery, also known as BGP unnumbered peering, reduces the amount of provisioning needed in large-scale BGP networks. Instead of configuring each BGP peering relationship individually, this technique automatically establishes BGP connectivity with neighbors using their IPv6 link-local addresses discovered through IPv6 neighbor discovery (RFC4861). This is particularly useful in data center underlay networks where eBGP peering between directly-connected nodes is common.

When coupled with the BGP Extended Next Hop Encoding capability described in RFC5549 (and in IPv6 Underlay for an IPv4 EVPN-VXLAN Fabric), you can take advantage of BGP auto-discovery even when you want to run an IPv4 EVPN-VXLAN overlay. The BGP Extended Next Hop Encoding capability enables the advertisement of IPv4 routes with IPv6 next hops, allowing IPv4 VTEPs to exist on an IPv6 underlay network.

Use Feature Explorer to confirm platform and release support for specific features.

Benefits of BGP Auto-Discovery Underlay

  • Simplified underlay BGP establishment from leaf to spine devices.

  • Faster onboarding of new leaf devices onto the EVPN-VXLAN fabric.

Related Documentation