Let's assume that I have fully working VXLAN fabric based on n9k switches and legacy network based on another switches. What are best practices of interconnecting them if I need only L3 connectivity between VXLAN and legacy networks? For simplicity let's take into consideration that legacy network supports BGP. One thing I am afraid about is how to prevent EVPN-generated host routes (/32 or /128) to leak to legacy network.
Those other host routes you need advertised - either permit them via prefix-list in route-map ahead of overall /32 deny, or add something like aggregate-address 10.x.x.x/24 summary-only that those host routes are a part of. Lots of options to handle this with BGP.
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