Site A and Site B use different EVPN route-target schemes for the same logical tenants. What DCI planning step is essential before multi-site membership works?
Select an answer to reveal the explanation.
Short Explanation
Route targets are the guest list for which EVPN routes a VRF will accept. If each city wrote different guest lists, DCI will not join until you align import/export on purpose. Selective RT design beats hoping VNIs alone sort it out.
Full Explanation
Multi-site EVPN membership depends on route-target policy: sites with different RT schemes must explicitly import/export the RTs that should be shared for each tenant. VNI equality alone does not replace RT membership. Matching RDs everywhere or flooding every Type-2 without RT discipline is not correct selective DCI design.