EVPN Inter-Domain Option-B Solution

An EVPN Inter-Domain interconnect solution is required when two or more sites of the same Ethernet Virtual Private Network (EVPN) are connected to different IGP domains or Autonomous Systems (AS) and need to communicate. The Inter-Domain Option-B connectivity model is one of the most popular solutions for this type of EVPN connectivity. While several documents address specific aspects of this interconnect approach, none provide a comprehensive overview of how Inter-Domain Option-B connectivity affects EVPN procedures. This document examines the behavior of EVPN procedures in an Inter-Domain Option-B network and proposes solutions to the identified issues.