Re: [Bier] I-D Action: draft-ietf-bier-te-arch-12.txt

Toerless Eckert <> Fri, 28 January 2022 17:17 UTC

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Date: Fri, 28 Jan 2022 18:17:03 +0100
From: Toerless Eckert <>
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Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-arch-12.txt
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This -12 revision of the draft should incooperate fixes for all IESG and directorate reviews.
Hopefully i have missed no reviewers reply. If you did provide a reply that you expect
feedback from and you don't see your name listed in aknowledgement and/or didn't receive
a reply to your email, pls. yell here!

Thanks a lot for all reviews & comments!


On Fri, Jan 28, 2022 at 08:56:59AM -0800, wrote:
> 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-12.txt
> 	Pages           : 67
> 	Date            : 2022-01-28
> Abstract:
>    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).
>    As it operates on the same per-packet stateless forwarding
>    principles, BIER-TE can also be a good fit to support multicast path
>    steering in "Segment Routing" (SR) networks.
> The IETF datatracker status page for this draft is:
> There is also an htmlized version available at:
> A diff from the previous version is available at:
> Internet-Drafts are also available by rsync at