Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

Gyan Mishra <hayabusagsm@gmail.com> Thu, 03 December 2020 03:39 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Wed, 2 Dec 2020 22:39:46 -0500
Message-ID: <CABNhwV0Q=c3stLgWAJZHWqJVxS0PsEPiK8gygUAbZG-g1bWJ3Q@mail.gmail.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, lsr <lsr@ietf.org>
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Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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I support WG adoption.  This is a much needed traffic engineering
capability independent of MPLS.

Thanks

Gyan

On Wed, Dec 2, 2020 at 8:32 PM Aijun Wang <wangaijun@tsinghua.org.cn> wrote:

> Hi, authors:
>
>
>
> Want to confirm one thing:
>
> Does the mechanism described in this draft support the automatic fallback
> from “flex algorithm” to the “traditional least-cost algorithm”?
>
> That is to say, can one prefix exists both in the “flex algorithm” table
> and “traditional least-cost algorithm” table, the router prefer to
> forwarding the packet based on the former table, and if not hit, then
> lookup the latter table?
>
>
>
> From the context of the document, the answer seems not, or even on the
> contrary?
>
> In cases where a prefix advertisement is received in both a IPv4
>
>    Prefix Reachability TLV and an IPv4 Algorithm Prefix Reachability
>
>    TLV, the IPv4 Prefix Reachability advertisement MUST be preferred
>
>    when installing entries in the forwarding plane.
>
>
>
> If so, what the value to deploy such flexible algorithm within the
> network? From my POV, the reason that we want to deploy such mechanism is
> that we want to differentiate the path(result of flex algorithm) of some
> traffic from that(result of traditional least-cost algorithm) of most other
> normal traffic.
>
>
>
> Best Regards
>
>
>
> Aijun Wang
>
> China Telecom
>
>
>
> *From:* lsr-bounces@ietf.org <lsr-bounces@ietf.org> *On Behalf Of *Acee
> Lindem (acee)
> *Sent:* Wednesday, December 2, 2020 5:13 AM
> *To:* lsr <lsr@ietf.org>
> *Subject:* [Lsr] WG Adoption Call for "IGP Flexible Algorithms
> (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
>
>
>
> This IP Flex Algorithm draft generated quite a bit of discussion on use
> cases and deployment prior to IETF 109 and there was generally support for
> WG adoption. This begins a two week WG adoption call. Please indicate your
> support or objection to WG adoption on this list prior to 12:00 AM UTC on
> December 16th, 2020. Also, review comments are certainly welcome.
>
> Thanks,
>
> Acee
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
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