Tuesday, January 14, 2020

EVPN Auto-RD and Duplicate MAC Addresses

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?

If the above sentence sounded like Latin, go through short EVPN terminology first (and I would suggest watching the EVPN Technical Deep Dive webinar).
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Thanks to Ivan Pepelnjak (see source)

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