[bess] I-D Action: draft-ietf-bess-evpn-irb-mcast-01.txt

internet-drafts@ietf.org Mon, 16 July 2018 18:38 UTC

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Subject: [bess] I-D Action: draft-ietf-bess-evpn-irb-mcast-01.txt
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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) Forwarding
        Authors         : Wen Lin
                          Zhaohui Zhang
                          John Drake
                          Eric C. Rosen
                          Jorge Rabadan
                          Ali Sajassi
	Filename        : draft-ietf-bess-evpn-irb-mcast-01.txt
	Pages           : 76
	Date            : 2018-07-16

   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.

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