Date: Wed, 21 Sep 2016 21:12:11 -0400 From: Ryan Stone <rysto32@gmail.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: Kubilay Kocak <koobs@freebsd.org>, freebsd-net <freebsd-net@freebsd.org>, Karl Pielorz <kpielorz_lst@tdx.co.uk>, Steven Hartland <killing@multiplay.co.uk> Subject: Re: lagg Interfaces - don't do Gratuitous ARP? Message-ID: <CAFMmRNwZBEJ9Me4FSh=W7fRNjm4344jiUGuJqX8KUB_0sWcajA@mail.gmail.com> In-Reply-To: <20160921235703.GG1018@cell.glebi.us> References: <0D84203FAAFD0A8E7BBB24A3@10.12.30.106> <bc33560b-59bc-01be-6a5d-7994ac121258@multiplay.co.uk> <6E574F1B61786E6032824A88@10.12.30.106> <2c62f5f0-3fb4-f513-2a8f-02de3a1d552f@FreeBSD.org> <20160921235703.GG1018@cell.glebi.us>
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On Wed, Sep 21, 2016 at 7:57 PM, Gleb Smirnoff <glebius@freebsd.org> wrote: > IMHO, the original patch was absolutely evil hack touching multiple > layers, for the sake of a very special problem. > > I think, that in order to kick forwarding table on switches, lagg > should: > > - allocate an mbuf itself > - set its source hardware address to its own > - set destination hardware to broadcast > - put some payload in there, to make packet of valid size. Why should it be > gratuitous ARP? A machine can be running IPv6 only, or may even use > whatever > higher level protocol, e.g. PPPoE. We shouldn't involve IP into this > Layer 2 > problem at all. > - Finally, send the prepared mbuf down the lagg member(s). > > And please don't hack half of the network stack to achieve that :) > The original report in this thread is about a system where it takes almost 15 minutes for the network to start working again after a failover. That does not sound to me like a switch problem. That sounds to me like the ARP cache on the remote system. To fix such a case we have to touch L3.
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