Another EVPN reader question, this time focusing on auto-RD functionality and how it works with duplicate MAC addresses:
If set to Auto, RD generated will be different for the same VNI across the EVPN switches. If the same route (MAC and/or IP) is present under different leaves of the same L2VNI, since the RD is different there is no best path selection and both will be considered. It’s a misconfiguration and shouldn’t be allowed. How will the BGP deal with this?
Thanks to Ivan Pepelnjak (see source)