You are designing overlay solutions for two Data Centers based on the Aruba CX platform. Each Data Center has two rooms and each room is its own fabric. What is the routing protocol used for EVPN…

Question

Options

• AOSPF
• BiBGP
• CeBGP
• DEIGRP

• A
  5% (2)
• B
  89% (34)
• C
  3% (1)
• D
  3% (1)

Explanation

Within a single room (fabric) in an Aruba CX EVPN/VXLAN design, all leaf and spine switches share the same Autonomous System (AS), making iBGP the correct control-plane protocol for exchanging EVPN route advertisements (MAC/IP type-2, IP prefix type-5) between VTEPs inside that fabric.

Why the distractors are wrong:

• A (OSPF) and D (EIGRP) are IGPs used for the underlay (providing IP reachability between loopbacks) - neither supports EVPN address families, so they cannot carry overlay advertisements.
• C (eBGP) applies between different ASes - it would be used between the two Data Centers or between rooms if each room runs a separate AS, not within a single room fabric.

Memory tip: The "i" in iBGP stands for internal - same AS, same room, same fabric. Think: iBGP = Inside the fabric, eBGP = External (between fabrics/DCs).

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