EVPN (MAC-VRF) Multi-Homing Preference based DF Election (Revertive)

You can control the designated forwarder (DF) election in a multihomed EVPN environment by using an administrative preference value for an Ethernet segment identifier (ESI). By default, all the multihoming devices perform the DF election (as specified in RFC 7432) randomly by using the modulo operation. With the preference-based DF election, the DF is elected manually using interface configuration options, such as the preference value and the router ID or loopback address. This method of DF election is useful when there is a need to choose the DF based on interface attributes such as the bandwidth associated with the interface.