A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : EVPN Optimized Inter-Subnet Multicast (OISM) 
        Authors         : Wen Lin
                          Zhaohui Zhang
                          John Drake
                          Eric C. Rosen
                          Jorge Rabadan
                          Ali Sajassi
        Filename        : draft-ietf-bess-evpn-irb-mcast-00.txt
        Pages           : 72
        Date            : 2018-02-13

   Ethernet VPN (EVPN) provides a service that allows a single Local
   Area Network (LAN), i.e., a single IP subnet, to be distributed over
   multiple sites.  The sites 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 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.

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