{"draft":"draft-ietf-bess-evpn-redundant-mcast-source-15","doc_id":"RFC9856","title":"Multicast Source Redundancy in EVPNs","authors":["J. Rabadan, Ed.","J. Kotalwar","S. Sathappan","Z. Zhang","W. Lin"],"format":["HTML","TEXT","PDF","XML"],"page_count":"31","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"BGP Enabled ServiceS","abstract":"In Ethernet Virtual Private Networks (EVPNs), IP multicast traffic\r\nreplication and delivery play a crucial role in enabling efficient\r\nand scalable Layer 2 and Layer 3 services. A common deployment\r\nscenario involves redundant multicast sources that ensure high\r\navailability and resiliency. However, the presence of redundant\r\nsources can lead to duplicate IP multicast traffic in the network,\r\ncausing inefficiencies and increased overhead. This document\r\nspecifies extensions to the EVPN multicast procedures that allow for\r\nthe suppression of duplicate IP multicast traffic from redundant\r\nsources. The proposed mechanisms enhance the EVPN's capability to\r\ndeliver multicast traffic efficiently while maintaining high\r\navailability. These extensions are applicable to various EVPN\r\ndeployment scenarios and provide guidelines to ensure consistent and\r\npredictable behavior across diverse network topologies.","pub_date":"September 2025","keywords":["Warm standby","hot standby","OISM","redundant G-source","SFG","Single Flow Group"],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC9856","errata_url":null}