EVPN Optimized Inter-Subnet Multicast (OISM) Forwarding

Document Type Expired Internet-Draft (bess WG)
Authors Wen Lin  , Zhaohui Zhang  , John Drake  , Eric Rosen  , Jorge Rabadan  , Ali Sajassi 
Last updated 2021-04-16 (latest revision 2020-10-13)
Replaces draft-lin-bess-evpn-irb-mcast
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Consensus: Waiting for Write-Up
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Ethernet VPN (EVPN) provides a service that allows a single Local Area Network (LAN), comprising a single IP subnet, to be divided into multiple "segments". Each segment may be located at a different site, and the segments are interconnected by an IP or MPLS backbone. Intra-subnet traffic (either unicast or multicast) always appears to the endusers to be bridged, even when it is actually carried over the IP or MPLS backbone. When a single "tenant" owns multiple such LANs, EVPN also allows IP unicast traffic to be routed between those LANs. This document specifies new procedures that allow inter-subnet IP multicast traffic to be routed among the LANs of a given tenant, while still making intra-subnet IP multicast traffic appear to be bridged. These procedures can provide optimal routing of the inter- subnet multicast traffic, and do not require any such traffic to leave a given router and then reenter that same router. These procedures also accommodate IP multicast traffic that needs to travel to or from systems that are outside the EVPN domain.


Wen Lin (wlin@juniper.net)
Zhaohui Zhang (zzhang@juniper.net)
John Drake (jdrake@juniper.net)
Eric Rosen (erosen52@gmail.com)
Jorge Rabadan (jorge.rabadan@nokia.com)
Ali Sajassi (sajassi@cisco.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)