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Re: [Bier] WGLC: draft-ietf-bier-non-mpls-bift-encoding

Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com> Mon, 28 January 2019 09:18 UTC

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From: Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com>
Date: Mon, 28 Jan 2019 14:49:13 +0530
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To: Greg Shepherd <gjshep@gmail.com>
Cc: BIER WG <bier@ietf.org>
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Subject: Re: [Bier] WGLC: draft-ietf-bier-non-mpls-bift-encoding
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Support !
However, i would like to get couple of clarifications with respect to the
BIFT-id in non-MPLS networks.

1.

Excerpts from section 2.2.1.1 from RFC8296

   In an MPLS network, since the BIFT-id is an MPLS label, its value may
   be changed as a BIER packet goes from BFR to BFR.  In a non-MPLS
   network, since the BIFT-id is domain-wide unique, it is not
expected    // Senthil
   to change as a BIER packet travels.


Senthil// I believe, we do not want to mandate that the BIFT-id must be
domain-wide-unique in case of non-MPLS networks (for the sake of
flexibility).
              If its *not* domain-wide-unique, then the BIFT-id may change
in BFR's as the BIER packet travels from BFIR to BFER.
              Authors & Fellow BIER'ers, let me know what do you think ?

2.

draft-ietf-bier-non-mpls-bift-encoding-01 proposes two encoding methods for
BIFT-id and is mentioned that, both of the encoding options are to derive
"domain-wide-unique: BIFT-id's.

I believe, option-2, that is  "6. The Non-MPLS Static IBU-SI BIFT Encoding",
is flexible and can be used for non-domain-wide-unique BIFT-id's also.

If we agree that, we should allow "non-domain-wide-unique" BIFT-id's for
non-MPLS networks, can we re-phrase the text in
draft-ietf-bier-non-mpls-bift-encoding-01 to specify that, such an encoding
option can be used for non-domain-wide-unique cases as well ?

Thanks,
Senthil


On Sat, Jan 26, 2019 at 1:43 AM Greg Shepherd <gjshep@gmail.com> wrote:

>
> Change of subject. This is WGLC for:
>
> https://datatracker.ietf.org/doc/draft-ietf-bier-non-mpls-bift-encoding/
>
> Same two week timer.
>
> Thanks
>
> On Fri, Jan 25, 2019 at 10:13 AM Greg Shepherd <gjshep@gmail.com> wrote:
>
>> Please read and reply to this thread with your vote for/against adoption
>> of:
>>
>> https://datatracker.ietf.org/doc/draft-ietf-bier-non-mpls-bift-encoding/
>>
>> ..as a BIER WG document.
>>
>> This starts a two week counter.
>>
>> Thanks,
>> Chairs
>> (Shep)
>>
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