Abstract An alternative to the default Designated Forwarder (DF) selection algorithm in Ethernet VPNs (EVPNs) is defined. The DF is the Provider Edge (PE) router responsible for sending Broadcast@ Unknown Unicast@ and Multicast (BUM) traffic to a multihomed Customer Edge (CE) device on a given VLAN on a particular Ethernet Segment (ES). In addition@ the ability 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 services. Therefore@ it updates the EVPN specification (RFC 7432).
RFC 8584-2019 history
2019RFC 8584-2019 Framework for Ethernet VPN Designated Forwarder Election Extensibility