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Framework for Ethernet VPN Designated Forwarder Election Extensibility

An alternative to the Default Designated Forwarder (DF) selection
algorithm in Ethernet VPN (EVPN) networks is defined. The DF is the
Provider Edge (PE) router responsible for sending broadcast, unknown
unicast and multicast (BUM) traffic to multi-homed Customer Equipment
(CE) on a particular Ethernet Segment (ES) within a VLAN. In addition,
the capability to influence the DF election result for a VLAN based on
the state of the associated Attachment Circuit (AC) is specified. This
document clarifies the DF Election Finite State Machine in EVPN,
therefore it updates the EVPN specification.