Which of these is a key CX EVPN VXLAN capability?

Question

Options

• ASupport Asymmetric Integrated Routing and Bridging (IRB)
• BOnly supports centralized gateway to route between overlay networks
• CARP suppression
• DDoes not forward broadcasts, unicasts, and multicast (BUM) traffic in the overlay

• A
  2% (1)
• B
  7% (3)
• C
  88% (37)
• D
  2% (1)

Explanation

ARP suppression is a core capability of EVPN VXLAN because the BGP EVPN control plane distributes MAC-IP bindings across all VTEPs, allowing local VTEPs to answer ARP requests on behalf of remote hosts without flooding the request across the fabric - dramatically reducing unnecessary traffic and improving scalability.

Why the distractors are wrong:

• A is incorrect because CX EVPN VXLAN supports Symmetric IRB, not asymmetric. Symmetric IRB (where both ingress and egress VTEPs route) is the standard model; asymmetric IRB is less efficient and not a promoted capability.
• B is the opposite of a key benefit: EVPN VXLAN enables a distributed anycast gateway model, where any VTEP can act as the default gateway - centralized gateways are the older, less scalable approach it replaces.
• D is incorrect because EVPN VXLAN does handle BUM (Broadcast, Unknown Unicast, Multicast) traffic - via ingress replication or underlay multicast. It reduces BUM traffic (through ARP suppression and MAC learning), but it doesn't eliminate forwarding it entirely.

Memory tip: Think of ARP suppression as EVPN VXLAN's "answer locally, ask never" policy - the control plane pre-populates MAC-IP tables so VTEPs never need to shout ARP requests across the fabric. If a capability sounds like it limits EVPN VXLAN (centralized only, no BUM handling), it's almost certainly wrong.

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