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Re: [Bier] WG adoption call for draft-chen-bier-frr-02

Huaimo Chen <huaimo.chen@futurewei.com> Sat, 20 March 2021 04:47 UTC

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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Greg Mirsky <gregimirsky@gmail.com>
CC: "bier@ietf.org" <bier@ietf.org>, BIER WG Chairs <bier-chairs@ietf.org>
Thread-Topic: [Bier] WG adoption call for draft-chen-bier-frr-02
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Date: Sat, 20 Mar 2021 04:47:39 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/Zj17ROA-k1GtiyR5AdI1BqJ5tvo>
Subject: Re: [Bier] WG adoption call for draft-chen-bier-frr-02
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Hi Greg,

    Thanks for your comments/questions.
    My responses to another email below should address/answer them.

https://mailarchive.ietf.org/arch/msg/bier/VsTPRmUi-26VSWrBPzdnLXzPvT0/


Best Regards,
Huaimo
________________________________
From: Greg Mirsky <gregimirsky@gmail.com>
Sent: Wednesday, March 17, 2021 12:45 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: bier@ietf.org <bier@ietf.org>; BIER WG Chairs <bier-chairs@ietf.org>
Subject: Re: [Bier] WG adoption call for draft-chen-bier-frr-02

Hi Huaimo,
it seems that you are suggesting using IP FRR and BIER FRR in the same domain. Is my understanding correct? Multi-layer protection in a network may work but, in my opinion, overcomplicated network management and operation. Would you expect that BIER FRR is more responsive to a network failure than IP FRR? What benefits could be in such a scenario? Which parameters, in your opinion, need to be coordinated between IP and BIER layers? I think that if the document includes the concurrent use of IP FRR and BIER FRR it should provide more detail on how such a scenario could be realized.

Regards,
Greg

On Tue, Mar 16, 2021 at 10:27 AM Huaimo Chen <huaimo.chen@futurewei.com<mailto:huaimo.chen@futurewei.com>> wrote:
Hi Tony,

    Even though there is IGP running in the network and the underlay IP FRR is provided, the BIER FRR seems still needed. All the BIER packets are forwarded using the BIFTs. They are not forwarded using the normal FIBs with IP FRR support.  When a failure happens in the network, the BIER packets will still be forwarded using the old BIFTs without considering the failure until the old BIFT is recomputed and updated based on the new network topology after the failure. During this period (from the time of the failure to the time at which the BIFTs are updated), the BIER packets may be lost.

Best Regards,
Huaimo
________________________________
From: Tony Przygienda <tonysietf@gmail.com<mailto:tonysietf@gmail.com>>
Sent: Tuesday, March 16, 2021 12:58 PM
To: Huaimo Chen <huaimo.chen@futurewei.com<mailto:huaimo.chen@futurewei.com>>
Cc: Michael Menth <menth@uni-tuebingen.de<mailto:menth@uni-tuebingen.de>>; bier@ietf.org<mailto:bier@ietf.org> <bier@ietf.org<mailto:bier@ietf.org>>
Subject: Re: [Bier] WG adoption call for draft-chen-bier-frr-02

we need a framework here ;-)

when IGP calculates the underlying FRR it's always a better solution. Nothing is faster than IGP and anything calculated as "better FRR" or "backup FRR" will not have the topology to do a better job/faster than IGP can. So AFAIS the only real use case here is BIER without IGP signalling but correct me if I'm wrong

-- tony


On Tue, Mar 16, 2021 at 5:02 PM Huaimo Chen <huaimo.chen@futurewei.com<mailto:huaimo.chen@futurewei.com>> wrote:
Hi Michael,

    Thanks much for your valuable comments.
    My responses are inline below with prefix [HC].

Best Regards,
Huaimo
________________________________
From: BIER <bier-bounces@ietf.org<mailto:bier-bounces@ietf.org>> on behalf of Michael Menth <menth@uni-tuebingen.de<mailto:menth@uni-tuebingen.de>>
Sent: Tuesday, March 16, 2021 7:11 AM
To: bier@ietf.org<mailto:bier@ietf.org> <bier@ietf.org<mailto:bier@ietf.org>>
Subject: Re: [Bier] WG adoption call for draft-chen-bier-frr-02

Hi Tony, all,

Am 16.03.2021 um 11:08 schrieb Tony Przygienda:

> I think it's a good addition within the architecture for the case IGP is
> not used for signalling, e.g. when controller or static programming.

Right. The solution may make sense if the routing underlay does not
offer FRR capabilities.

[HC]: When the routing underlay supports IP FRR, the BIER should also
provide BIER FRR since the BIER packets are forwarded using the BIFTs.
When failures happen in the network, the BIER packets are still forwarded
using the old BIFTs until the old BIFTs are updated according to the
updated network topology after the failures.

>
> The draft must however explain in what scenarios it is used and quote
> the according IGP drafts to guarantee loop-free behavior (well, BIER
> will tie-break loops but we'll have 1x microloop & possibly not deliver
> payload if BIER FRR is not properly computed/intsalled). With that the
> draft should also pay attention to how the function is deployed/updated
> network-wide if IGP is not present

I agree. in the absence of an IGP, the "native BIER-FRR on bier layer"
must be set by a controller.

[HC]: I agree too.

So, below the line, an applicability statement would be helpful. What
are those cases?
- IGP running but without FRR on the routing underlay?
- No IGP and no FRR on the routing underlay?

[HC]: When IGP is running in the network, each BFR in the network calculates,
installs and/or updates its BIER FRR BIFTs. The BIER FRR in the draft is
independent of the underlay IP FRR.
When no IGP is running in the network, the BIER controller for the network
calculates, installs and/or updates the BIER FRR BIFTs into BFRs in the network,
regardless of whether the routing underlay FRR is provided.


However, if the controller takes care of BIER-FRR, what could be reasons
for missing FRR on the routing underlay? If there is a FRR on the
routing underlay (also provided through a controller), tunnel-based
bier-frr solves the problem in a transparent way.

[HC]: The BIER FRR in the draft is independent of the underlay IP FRR.
Regardless of whether the routing underlay FRR is provided, the
BIER FRR BIFTs are computed in the same way.

BTW, we studied protection variants for controller-based infrastructures
(for routing underlays, not for BIER). Challenge is to keep state low.
LFA-based solutions help a lot and outperform others. 100% protection is
possible with only little additions. Results are available:
https://nam11.safelinks.protection.outlook.com/?url=https:%2F%2Fatlas.informatik.uni-tuebingen.de%2F~menth%2Fpapers%2FMenth20-Sub-6.pdf&amp;data=04%7C01%7Chuaimo.chen%40futurewei.com%7C5d3cb8163c7f4a1557e608d8e86c408f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637514898966623524%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=03cc%2BIvdV%2BCg%2F0PCFulWzuCa0h4I5sBqn8K5QPT5BR8%3D&amp;reserved=0<https://nam11.safelinks.protection.outlook.com/?url=https:%2F%2Fatlas.informatik.uni-tuebingen.de%2F~menth%2Fpapers%2FMenth20-Sub-6.pdf&data=04%7C01%7Chuaimo.chen%40futurewei.com%7C3d527e94172b4e7234fb08d8e96422e4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637515963615768749%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=oSLGnBnwcsrY2gaRZqG%2FLSMOYLNQcG0Mjm9NNVc6TUU%3D&reserved=0> (under
revision)

[HC]: Thanks much for your information.


Regards,

Michael

>
> thanks
>
> -- tony
>
> On Tue, Mar 16, 2021 at 7:41 AM <zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>
> <mailto:zhang.zheng@zte.com.cn>> wrote:
>
>     A 2-week WG adoption call begins for the following draft:
>
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>
>     Please indicate your support or objection by March 30th, 2021.
>
>     Authors, please respond to the list indicating whether you are aware
>     of any IPR that applies to this draft.
>
>     Thanks,
>
>     Sandy (As WG secretary, on behalf of Greg/Tony)
>
>
>
> _______________________________________________
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>

--
Prof. Dr. habil. Michael Menth
University of Tuebingen
Faculty of Science
Department of Computer Science
Chair of Communication Networks
Sand 13, 72076 Tuebingen, Germany
phone: (+49)-7071/29-70505
fax: (+49)-7071/29-5220
mailto:menth@uni-tuebingen.de
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