[Bier] I-D Action: draft-ietf-bier-te-arch-13.txt

internet-drafts@ietf.org Mon, 25 April 2022 23:35 UTC

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Subject: [Bier] I-D Action: draft-ietf-bier-te-arch-13.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           : Tree Engineering for Bit Index Explicit Replication (BIER-TE)
        Authors         : Toerless Eckert
                          Michael Menth
                          Gregory Cauchie
	Filename        : draft-ietf-bier-te-arch-13.txt
	Pages           : 65
	Date            : 2022-04-25

   This memo describes per-packet stateless strict and loose path
   steered replication and forwarding for "Bit Index Explicit
   Replication" (BIER, RFC8279) packets.  It is called BIER Tree
   Engineering (BIER-TE) and is intended to be used as the path steering
   mechanism for Traffic Engineering with BIER.

   BIER-TE introduces a new semantic for "bit positions" (BP).  They
   indicate adjacencies of the network topology, as opposed to (non-TE)
   BIER in which BPs indicate "Bit-Forwarding Egress Routers" (BFER).  A
   BIER-TE packets BitString therefore indicates the edges of the (loop-
   free) tree that the packet is forwarded across by BIER-TE.  BIER-TE
   can leverage BIER forwarding engines with little changes.  Co-
   existence of BIER and BIER-TE forwarding in the same domain is
   possible, for example by using separate BIER "sub-domains" (SDs).
   Except for the optional routed adjacencies, BIER-TE does not require
   a BIER routing underlay, and can therefore operate without depending
   on an "Interior Gateway Routing protocol" (IGP).

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