<div dir="ltr">Hi,<div><br></div><div><br></div><div>Unfortunately not. I hope we will raise a bug with Juniper, but it could take a while to get any resolution.</div><div><br></div><div>It would also be interesting to know if there is something more Bird could/should be doing in this case - I hope for some developer feedback on the issue :)</div><div><br></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div><br></div>Cheers,<div>Just</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 23 Aug 2021 at 12:21, Oliver <<a href="mailto:bird-o@sernet.de">bird-o@sernet.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Just,<br>
<br>
do you made any progress on this? We have the same problem with Deutsche<br>
Telekom as Upstream provider. They also have Juniper Router.<br>
<br>
Best regards,<br>
<br>
Oliver<br>
<br>
On Tue, 10 Aug 2021, Justin Cattle wrote:<br>
<br>
> Forgot to mention, in the bird logs I see lofs of message such as this:<br>
> <br>
> <RMT> bfd1: Bad packet from 1.1.11.2 - unknown session id (0123456789)<br>
> <br>
> <br>
> Cheers,<br>
> Just<br>
> <br>
> <br>
> On Tue, 10 Aug 2021 at 13:20, Justin Cattle <<a href="mailto:j@ocado.com" target="_blank">j@ocado.com</a>> wrote:<br>
> <br>
> > Hi,<br>
> ><br>
> ><br>
> > I have encountered what seems to be a bug of sorts in the Juniper<br>
> > implementation of BFD in at least their SRX340.<br>
> ><br>
> > We have no issues with the QFX series, where BFD seems to work as expected<br>
> > with bird.<br>
> ><br>
> > I'm wondering if there is anything we can do to handle this issue on the<br>
> > bird side, or if anyone has any insight that may shed some light on the<br>
> > behaviour we are seeing.<br>
> ><br>
> > Here is the issue summary:<br>
> ><br>
> > - BFD timers are set quite conservatively<br>
> > - interval 4000 ms<br>
> > - multiplier 6<br>
> ><br>
> ><br>
> > - A BFD session between a bird endpoint and a juniper endpoint is up<br>
> > and running at the start - all fine<br>
> > - If the you stop bird on the server, after the Detection time [<br>
> > currently 24 secs ], the BFD messages from the Juniper show status as Down<br>
> > with the Diagnostic message Control Detection Time Expired. You can then<br>
> > start bird on the server again, and the two sides will agree session info<br>
> > and BFD status goes Up. - This is expected.<br>
> > - However, if you stop bird, but start it again before the Detection<br>
> > time [ currently 24 secs ], like for a service restart, the BFD messages<br>
> > from the Juniper never show as Down, and the two sides never agree on a BFD<br>
> > session and BFD remains Down on the server but Up on the Juniper. - Should<br>
> > a new session be established at this point ?<br>
> > - Once the Juniper gets stuck in the BFD status Up state, then you can<br>
> > stop the bird for a long time [ over an hour at least ] , and the Juniper<br>
> > never seems to notice [ the BFD packets still show state Up ]. - This seems<br>
> > to be a bug n the juniper end - why should it never go Down in this state ?<br>
> > - If the BFD session info is reset on the Juniper side, then the two<br>
> > sides will agree session info and BFD status goes Up.<br>
> ><br>
> ><br>
> > Does anyone have any thoughts ?<br>
> ><br>
> > Is there a packet bird can send, gratuitous or not, that can make the<br>
> > juniper end realise it MUST reinitialize ?<br>
> > Any config that can be tweaked to help ?<br>
> ><br>
> ><br>
> > Cheers,<br>
> > Just<br>
> ><br>
> <br>
> -- <br>
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