Update: Automatic EVPN Route Targets in EBGP Environments
After I posted the EVPN Route Target Considerations section of BGP in Data Center Fabrics document Lukas Krattiger pointed out another option available with Cisco Nexus-OS: it can rewrite ASN portion of EVPN Route Target in incoming EBGP updates. Updated version of the affected section is already online.
The true "beauties" start when vendors try to persuade you to use "interesting" designs like running IBGP over EBGP for no good reason (apart from lock-in).
http://www.eantc.de/fileadmin/eantc/downloads/events/2011-2015/MPLSSDNNFV_2017/EANTC-MPLSSDNNFV2017-WhitePaper-Final_v2.pdf
Here is the latest that happened 1 month ago :
http://www.eantc.de/fileadmin/eantc/downloads/events/2017-2020/MPLS2018/EANTC-MPLSSDNNFV2018-WhitePaper-final.pdf
I tested in my lab interoperability between Arista & Cisco 9K just for fun (no reason to mix leaf/spine from different vendors I agree :) )