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BGP Auto-Discovery Underlay for EVPN-VXLAN

A BGP auto-discovery underlay, as defined by RFC 5549, auto-discovers eBGP peer neighbors using the link-local IPv6 addresses. Enabling this underlay for EVPN-VXLAN helps simplify your EVPN-VXLAN network. When running RFC 5549-defined BGP unnumbered peering in the underlay BGP, you can use EVPN Type 2 media access control (MAC) virtual routing and forwarding (VRF) or EVPN-VXLAN Type 5 IP VRF for the overlay. While the underlay links run the IPv6 link-local, the EVPN-VXLAN overlay can still use the IPv4 tunnel termination using the embedded advertisement. You can use EVPN-VXLAN Type 2 and Type 5 routing instances on the same fabric as BGP unnumbered peering.

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

Benefits of BGP Auto-Discovery Underlay

  • Simplified underlay BGP establishment without enabling Point-to-Point Protocol addresses from leaf to spine devices.

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

Related Documentation