What protocol is primarily used to establish EVPN for layer 2 connectivity over an underlay network?

Question

Options

• ABGP
• BOSPF
• CRIP
• DEIGRP

• A
  85% (23)
• B
  4% (1)
• C
  7% (2)
• D
  4% (1)

Explanation

BGP (Border Gateway Protocol) is the control plane protocol used to distribute EVPN routes and MAC/IP binding information between VTEPs (VTEP = VXLAN Tunnel Endpoint) in an EVPN fabric, making it the correct answer. OSPF and RIP are IGP (Interior Gateway Protocols) used for underlay reachability - they route IP traffic but have no mechanism to carry EVPN address-family information. EIGRP is a Cisco-proprietary distance-vector IGP that similarly lacks support for EVPN NLRI (Network Layer Reachability Information). BGP was chosen for EVPN because it already supports multiple address families (via MP-BGP extensions defined in RFC 7432) and scales well across large data center fabrics.

Memory tip: Think "BGP = Big Gray Peering" - it's the inter-domain protocol that scales to carry everything, including EVPN MAC routes, while OSPF/RIP/EIGRP are strictly IP routing protocols that only handle the underlay.

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