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Re: [Idr] Fwd: New Version Notification for draft-spaghetti-idr-bgp-sendholdtimer-05.txt

Gyan Mishra <hayabusagsm@gmail.com> Mon, 15 August 2022 19:10 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Mon, 15 Aug 2022 15:10:43 -0400
Message-ID: <CABNhwV1ngwPUf=kkYnn6Bw+Toj_jcojuJAh8yhmQJfH63u_RCA@mail.gmail.com>
To: Job Snijders <job@fastly.com>
Cc: Robert Raszuk <robert@raszuk.net>, "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] Fwd: New Version Notification for draft-spaghetti-idr-bgp-sendholdtimer-05.txt
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Job

On Mon, Aug 15, 2022 at 7:45 AM Job Snijders <job@fastly.com> wrote:

> On Mon, Aug 15, 2022 at 12:50:42PM +0200, Robert Raszuk wrote:
> > Please also observe that testing this is not that easy. It first
> > requires broken BGP implementation and either instrumented BGP I/O to
> > stop accepting arriving messages or forced by TCP peer's zero-window.
> > We are dancing here around a very unlikely/marginal event to occur in
> > practice.
>
> Wrong. Testing this is super easy! Ben Cartwright-Cox authored running
> code that triggers the problem in 100% of COTS vendors 100% of the time.
>

   Gyan> Excellent!  With the 100% successful recreate ( 5 famous ones),
how does the router detect the zero window to trigger the send hold timer
automatically?

 In your test bed so once the window is throttled down to 0 to recreate the
stuck scenario, in your send solution to fix stuck peer it’s a manual
config change for the send hold timer, correct?

For the NOC I think we want  an automated detection mechanism as it maybe
difficult to detect with normal means to find the stuck peer.  I guess one
option which could be scripted is look out for peer with large OutQ to
trigger the send hold timer.

>
> We call this the 'peer from hell', described 2 years ago:
> https://mailarchive.ietf.org/arch/msg/idr/DQTWtKesQs6sd8M7rYN6UMCd_QE/
>
> PCAPs of being connected to a 'peer from hell' are available at:
> https://mailarchive.ietf.org/arch/msg/idr/wViscLxTTcfFI_YGtb3Viq7-RhQ/
>
> Kind regards,
>
> Job
>
-- 

<http://www.verizon.com/>

*Gyan Mishra*

*Network Solutions A**rchitect *

*Email gyan.s.mishra@verizon.com <gyan.s.mishra@verizon.com>*



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