Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call

Gyan Mishra <hayabusagsm@gmail.com> Thu, 21 May 2020 14:38 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Thu, 21 May 2020 10:36:58 -0400
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To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call
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On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com>
wrote:

> Hi Gyan,
>
>     Thanks much for your questions. My answers are inline below with [HC].
>
> Best Regards,
> Huaimo
> ------------------------------
> *From:* Gyan Mishra <hayabusagsm@gmail.com>
> *Sent:* Wednesday, May 20, 2020 11:14 AM
> *To:* Huaimo Chen <huaimo.chen@futurewei.com>
> *Cc:* Acee Lindem (acee) <acee=40cisco.com@dmarc.ietf.org>rg>; lsr@ietf.org <
> lsr@ietf.org>
> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm -
> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call
>
> Huaimo
>
> This is a much needed feature that operators have been needing for densely
> meshed topologies that commonly exist in data centers to accommodate very
> high bandwidth E-W traffic.
> [HC]: Thank you very much.
>
> Below is link from Cisco which has introduced feature for dynamic flooding
> in clos high density ECMP data center topologies.
>
> Please look at the feature description and it does seem to be exactly the
> same as this draft.  Please confirm.
> [HC]: It seems different.
>
> There maybe other vendors due to industry demand have to get the feature
> deployed before it reaches standards vendor consensus with the IETF.
>
>
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-743015.html
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.cisco.com%2Fc%2Fen%2Fus%2Fproducts%2Fcollateral%2Fswitches%2Fnexus-9000-series-switches%2Fwhite-paper-c11-743015.html&data=02%7C01%7Chuaimo.chen%40futurewei.com%7Caf6069f07e9c4b9b881508d7fcd08b26%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637255844949669307&sdata=9nLFlmBSFxBQayL0fCiq864Ylvzyksk3U0GmZPbhPts%3D&reserved=0>
>
> We are testing this feature and planning to deploy but wanted to ensure
> that this is the same as the draft on the standards track.
> [HC]: The feature appears implemented draft "Dynamic Flooding on Dense
> Graphs", which does not include any flooding topology computation
> algorithm.
>

    Gyan> How does this draft compare to the WG LC draft for flood
reduction.  Would they be two eventual standard options in the operators
toolbox  or competing features for optimized flood reduction. Would having
two flood reduction features standardized versus one default IGP flood
reduction feature be confusing for operators.  Just as it was confusing to
me.


https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

>
> Kind regards
>
> Gyan
>
>
> On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com>
> wrote:
>
> Hi Gyan,
>
>     Thank you very much for your questions and support.
>
>     This Flooding Topology Computation algorithm can be used in the Dynamic
> Flooding on Dense Graphs to compute the flooding topologies for the data
> center clos dense meshed topologies with many ECMP paths. It can be used by
> the area leader in the centralized mode to compute the flooding topology.
>
> Best Regards,
> Huaimo
> ------------------------------
> *From:* Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <
> hayabusagsm@gmail.com>
> *Sent:* Tuesday, May 19, 2020 2:39 AM
> *To:* Yanhe Fan <yfan@casa-systems.com>
> *Cc:* lsr@ietf.org <lsr@ietf.org>rg>; Acee Lindem (acee) <acee=
> 40cisco.com@dmarc.ietf.org>
> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm -
> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call
>
>
> I support WG adoption and have a few questions related to the draft.
>
> Does this flooding algorithm use the dynamic flooding algorithm used in
> data center clos dense meshed topologies with many ECMP paths where the
> flood is decoupled from the physical topology.  In the dynamic flooding
> algorithm mentioned in centralized mode the flooding is computed by the
> area leader and distributed to all nodes.  In distributed mode each mode
> the area leader determines the algorithm and then each node computes the
> flooding topology based on the algorithm.
>
> This dynamic algorithm for optimized flood reduction would reduce the
> amount of redundant flooding in highly densely meshed ospf or Isis
> topologies.  So this optimization of flooding would improving overall link
> state routing protocol convergence.
>
> Gyan
>
> On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:
>
> Support it as a co-author.
>
>
>
> Thanks,
>
> Yanhe
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Acee Lindem (acee)
> *Sent:* Friday, May 15, 2020 3:40 PM
> *To:* lsr@ietf.org
> *Subject:* [Lsr] Flooding Topology Computation Algorithm -
> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call
>
>
>
> This begins a 3 week (due to holidays) WG adoption call for the “Flooding
> Topology Computation Algorithm” draft. Please issue your support or
> objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL
> for your convenience.
>
>
>
> https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-cc-lsr-flooding-reduction%2F&data=02%7C01%7Chuaimo.chen%40futurewei.com%7Caf6069f07e9c4b9b881508d7fcd08b26%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637255844949679298&sdata=08cwC5X8u06cotUPxaWyOq3euYKGK9Pfh0pieb7Tqf0%3D&reserved=0>
>
>
>
> Thanks,
> Acee
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> Mishra*
>
> *Network Solutions A**rchitect *
>
>
>
> *M 301 502-1347 13101 Columbia Pike
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