[quagga-users 14634] Re: Weird BGP Behavoiur

Richard J Palmer richard at merula.net
Sun Mar 5 12:01:47 GMT 2017


I'm also happy to look / debug if needed ....

It is deeply odd ...

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-----Original Message-----
From: Paul Thornton [mailto:paul at prt.org] 
Sent: 05 March 2017 11:53
To: Alexis Rosen <alexis at panix.com>
Cc: quagga-users at lists.quagga.net
Subject: [quagga-users 14633] Re: Weird BGP Behavoiur

Hi,

On 05/03/2017 11:30, Alexis Rosen wrote:
> On Mar 5, 2017, at 4:04 AM, Paul Thornton <paul at prt.org> wrote:
>> It is a royal pain to debug because it seems almost un-reproducible 
>> in the lab :(
>
> Because of this, I suspect the only way to resolve this in a reasonable
amount of time is by bisect. Doing that on a production network will suck.
But this bug has been running around free for at least a year, and if you're
right (below) more than 2.5.
>
>> FWIW, I have downgraded to 0.99.23.1 across the board as that is the last
release of Quagga that I can find that definitely does not have this issue.
>
> That's an interesting claim, and an important one. All the other reports
on this have been about versions 1.x.x, IIRC. Specifically, I was under the
impression that 0.99.24.1 did NOT show this bug. If you can reproduce this
bug in .24.1 (and .24.0), that will provide new and helpful info on where to
look to fix it. How sure are you about this?

Actually, I'm not 100% sure.  I thought I was, but now I'm not!

On our current production routers, we're running 0.99.23.1 - I am not
certain whether this is just a case of: "that was the version we were
running pre-upgrade to 1.0 and we know it works so are sticking with it".

Now it just so happens that during some lab staging of a new production
network for a customer a few weeks ago, I had a FreeBSD box acting as "The
Internet" which, amongst other things, carried a full routing table.

This *was* indeed running 1.something (I think it was 1.2) and saw the
problem, reproducibly with v6, and I downgraded that to *I think*
0.99.24.1 as we needed to get testing completed in a bit of a hurry.  I
cannot check right now what version that was but will be able to clarify
that next week.  Whatever version I used worked fine.

I may also be in a position where I can use this lab setup briefly after our
testing (as it is essentially a Quagga router providing transit to a
'production' network) to do some Quagga testing.  I don't know *what* I can
do in terms of trying to troubleshoot the code, but I could theoretically
run something with loads of debug and terrible performance in an attempt to
track down the issue.  If people can tell me what to look for / do here, I
can try and fit it in.  Certainly, if nothing else, I can use that to
absolutely determine which version is the first affected one.

Paul.

--
Paul Thornton

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