[Bier] I-D Action: draft-ietf-bier-te-arch-03.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 Bit Indexed Explicit Replication WG of the IETF.

        Title           : Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
        Authors         : Toerless Eckert
                          Gregory Cauchie
                          Michael Menth
	Filename        : draft-ietf-bier-te-arch-03.txt
	Pages           : 39
	Date            : 2019-07-08

Abstract:
   This memo introduces per-packet stateless strict and loose path
   engineered replication and forwarding for Bit Index Explicit
   Replication packets ([RFC8279]).  This is called BIER-TE.

   BIER-TE leverages the BIER architecture ([RFC8279]) and extends it
   with a new semantic for bits in the bitstring.  BIER-TE can leverage
   BIER forwarding engines with little or no changes.

   In BIER, the BitPositions (BP) of the packets bitstring indicate BIER
   Forwarding Egress Routers (BFER), and hop-by-hop forwarding uses a
   Routing Underlay such as an IGP.

   In BIER-TE, BitPositions indicate adjacencies.  The BIFT of each BFR
   are only populated with BPs that are adjacent to the BFR in the BIER-
   TE topology.  The BIER-TE topology can consist of layer 2 or remote
   (route) adjacencies.  The BFR then replicates and forwards BIER
   packets to those adjacencies.  This results in the aforementioned
   strict and loose path forwarding.

   BIER-TE can co-exist with BIER forwarding in the same domain, for
   example by using seperate sub-domains.  In the absence of routed
   adjacencies, BIER-TE does not require a BIER routing underlay, and
   can then be operated without requiring an IGP routing protocol.

   BIER-TE operates without explicit in-network tree-building and
   carries the multicast distribution tree in the packet header.  It can
   therefore be a good fit to support multicast path steering in Segment
   Routing (SR) networks.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bier-te-arch/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bier-te-arch-03
https://datatracker.ietf.org/doc/html/draft-ietf-bier-te-arch-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-te-arch-03


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