350-601 Question #296: Real Exam Question with Answer & Explanation

Question

An engineer must implement a VXLAN-based data center interconnect. The long-distance transport provided by a service provider is IP-based, supports a maximum MTU of 1554 bytes, and does not support outbound traffic replication. Which action must be taken to build the data center interconnect?

Options

• AAnnounce host reachability over BGP.
• BCreate an IP access list and associate it with VNI to replicate traffic to remote VTEPs.
• CConfigure a route map to associate the IPs of the remote VTEPs.
• DImplement BGP EVPN ingress replication.

Explanation

To implement a VXLAN-based DCI when the service provider does not support outbound traffic replication, BGP EVPN with ingress replication must be used to handle multicast/broadcast/unknown unicast traffic.

Common mistakes.

• A. Announcing host reachability over BGP is a part of BGP EVPN, but it alone does not address the specific problem of lacking outbound traffic replication for BUM traffic.
• B. An IP access list is used for filtering traffic and cannot be used to perform VXLAN BUM traffic replication to remote VTEPs.
• C. A route map is used for controlling routing updates or path selection, not for associating remote VTEP IPs for the purpose of VXLAN traffic replication.

Concept tested. VXLAN BGP EVPN ingress replication

Reference. https://www.cisco.com/c/en/us/td/docs/dcnm/11_3_1/configuration/vxlan/cisco-dcnm-vxlan-configuration-guide-1131/cisco-dcnm-vxlan-configuration-guide-1131_chapter_010.html

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