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Day 74 — VXLAN BGP EVPN: Underlay, VTEPs, VNIs and the Control Plane

November 14, 2026

1. Opening VXLAN and EVPN solve different parts of the same fabric problem. VXLAN is an encapsulation/overlay data-plane framework carried ...

November 12, 2026

1. Opening EVPN is not one route type with several display formats. It is a family of BGP NLRI that represents different service objects. A...

November 11, 2026

1. Opening BGP can advertise not only that a prefix is reachable, but also that a router has bound an MPLS label to that prefix. This is th...

November 10, 2026

1. Opening A route reflector carrying thousands of VPNs does not need to send every VPN route to every PE. Route Target Constraint adds a c...

November 08, 2026

1. Opening PE-CE BGP is where customer routing policy meets provider VPN policy. A route can be perfectly valid on the CE-PE session and st...

November 07, 2026

1. Opening An MPLS L3VPN must solve two different problems: overlapping customer addresses need to become unique inside the provider contro...

November 06, 2026

1. Opening IPv6 BGP is not a separate routing protocol; it uses MP-BGP to carry IPv6 unicast NLRI. The operational trap is assuming that be...

November 05, 2026

1. Opening Day 8 introduced AFI/SAFI as vocabulary. This day goes deeper into the actual MP-BGP machinery. The key attributes are MP_REACH_...