Re: [RTG-DIR] Rtgdir last call review of draft-ietf-rtgwg-yang-rib-extend-16

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Tue, 09 May 2023 21:15 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Acee Lindem <acee.ietf@gmail.com>
CC: Yingzhen Qu <yingzhen.ietf@gmail.com>, Routing Directorate <rtg-dir@ietf.org>, "draft-ietf-rtgwg-yang-rib-extend.all@ietf.org" <draft-ietf-rtgwg-yang-rib-extend.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Thread-Topic: Rtgdir last call review of draft-ietf-rtgwg-yang-rib-extend-16
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Date: Tue, 09 May 2023 21:15:10 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/wpb_UQfAEWU6fKUTLMhaJbFbTJk>
Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-rtgwg-yang-rib-extend-16
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Hi Acee,

For argument sake (this is non-blocking), I don't see difference between static routes and protocol-learned routes. Why would protocol-learned routes need to have nexthop-specific backup while static routes don't?

Thanks.
Jeffrey

-----Original Message-----
From: Acee Lindem <acee.ietf@gmail.com>
Sent: Thursday, May 4, 2023 10:51 AM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: Yingzhen Qu <yingzhen.ietf@gmail.com>; Routing Directorate <rtg-dir@ietf.org>; draft-ietf-rtgwg-yang-rib-extend.all@ietf.org; last-call@ietf.org; rtgwg@ietf.org
Subject: Re: Rtgdir last call review of draft-ietf-rtgwg-yang-rib-extend-16

[External Email. Be cautious of content]


Hi Jeffrey,


> On May 1, 2023, at 5:05 PM, Jeffrey (Zhaohui) Zhang <zzhang@juniper.net> wrote:
>
> Hi Yingzhen,
>  I can go with that if that’s what the authors/WG’s preference, but my preference would be to cover it in the base specification itself. What’s the harm?
>  Anyway, this is not a blocking comment.

The way the backup static route use case is handled is by configuring multiple next-hops with different preferences. This is one of the most useful  extensions provided by this augmentation.

Thanks,
Acee


>  Thanks.
> Jeffrey
>  From: Yingzhen Qu <yingzhen.ietf@gmail.com>
> Sent: Monday, May 1, 2023 5:01 PM
> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
> Cc: rtg-dir@ietf.org; draft-ietf-rtgwg-yang-rib-extend.all@ietf.org;
> last-call@ietf.org; rtgwg@ietf.org
> Subject: Re: Rtgdir last call review of
> draft-ietf-rtgwg-yang-rib-extend-16
>  [External Email. Be cautious of content]  Hi Jeffrey,  Considering
> this is not commonly used, I'd suggest if someone really needs it they can do an easy augmentation using the grouping defined in this draft.
>  Thanks,
> Yingzhen
>  On Mon, May 1, 2023 at 1:52 PM Jeffrey (Zhaohui) Zhang <zzhang@juniper.net> wrote:
> Hi Yingzhen,
>  From: Yingzhen Qu <yingzhen.ietf@gmail.com>
> Sent: Monday, May 1, 2023 4:46 PM
> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
> Cc: rtg-dir@ietf.org; draft-ietf-rtgwg-yang-rib-extend.all@ietf.org;
> last-call@ietf.org; rtgwg@ietf.org
> Subject: Re: Rtgdir last call review of
> draft-ietf-rtgwg-yang-rib-extend-16
>  [External Email. Be cautious of content]  Hi Jeffrey,  Thanks for the
> review, please see my answers below.
>  Thanks,
> Yingzhen
>  On Mon, May 1, 2023 at 11:43 AM Zhaohui Zhang via Datatracker <noreply@ietf.org> wrote:
> Reviewer: Zhaohui Zhang
> Review result: Has Issues
>
> I have the following one nit comment and one question:
>
>   augment "/rt:routing/rt:ribs/rt:rib/"
>     + "rt:routes/rt:route/rt:next-hop/rt:next-hop-options/"
>     + "rt:next-hop-list/rt:next-hop-list/rt:next-hop"
>   {
>     description
>       "Augment the multiple next hops with repair path.";
>     uses repair-path;
>   }
>
> The description is slightly misleading. It is to agument a single
> next-hop in the next-hop-list, not "multiple next hops".
> [Yingzhen] how about: "Augment the next-hop with a repair path."
>  Zzh> Good.
>  Shouldn't the repair path be applicable to static routes as well?
> [Yingzhen]: Theoretically you can have a repair-path for a static route, but have you seen this in deployment?
>  Zzh> Whether anyone implemented/deployed it that way, I think it’s quite reasonable and desired to have it covered in the spec. For example, a static route could be using if1 by default but if2 as backup (in case if1 is down).
>  Zzh> Jeffrey
>  Juniper Business Use Only
>
> Juniper Business Use Only



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