CCDE: Cisco Certified Design Expert (Practical) — Question 195

A customer migrates from a traditional Layer 2 data center network into a new SDN-based, spine-and-leaf VXLAN EVPN data center within the same location. The networks are joined to enable host migration at Layer 2. What is the final migration step, after hosts have physically migrated, to have traffic flowing through the new network without changing any host configuration?

Answer options

• A. Increase VRRP priorities on new infrastructure over legacy VRRP values, then shut down legacy SVIs.
• B. Shut down legacy Layer 3 SVIs and activate new preconfigured Layer 3 SVIs on VXLAN.
• C. Shut down legacy infrastructure to allow VXLAN gateways to become active.
• D. Shut down legacy Layer 3 SVIs, clear ARP caches on all hosts being migrated, and then configure the legacy VRRP address onto new VXLAN core switches.

Correct answer: B

Explanation

The correct answer is B because shutting down the legacy Layer 3 SVIs and activating the new preconfigured Layer 3 SVIs on VXLAN ensures that traffic is routed through the new network seamlessly. Options A and C do not directly address the need for immediate traffic flow through the new network, while option D introduces unnecessary complications by requiring ARP cache clearing.