Date: Fri, 6 Nov 2020 14:17:46 -0500 From: mike tancsa <mike@sentex.net> To: lev@FreeBSD.org, current@freebsd.org Subject: Link flap when adding / removing a vlan (was Re: r360902 breaks VLAN interface on if_em (82579LM)) Message-ID: <d67b7835-f7de-e230-08df-9d35b75b5b91@sentex.net> In-Reply-To: <711876429.20200601003941@serebryakov.spb.ru> References: <88004d48-4434-875a-5a36-0627b00c2f38@gmail.com> <1906251966.36777.1590562439792.JavaMail.open-xchange@opme11oxm03aub.bagnolet.francetelecom.fr> <997c1389-5e18-b07e-d342-c787c841a4c4@gmail.com> <711876429.20200601003941@serebryakov.spb.ru>
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On 5/31/2020 5:39 PM, Lev Serebryakov wrote: > Hello Ian, > > Thursday, May 28, 2020, 2:45:48 AM, you wrote: > >> I noticed that my VLAN interfaces stopped working after a recent build. >> tcpdump showed traffic leaving leaving and entering the interface but no >> host on the network actually received any packets from this host. A >> binary search led me to r360902 and indeed the following change fixed >> the issue for me: > Problem is, this change will return terrible situation when adding new VLAN > will flap connection status. > > It all worked before iflib: hardware VLAN filtering worked, and > adding/removing new VLAN didn't cause link to flap. > > Now, with iflib, looks like we can not have all good things at once :( Hi All, Just came across this thread as I am running into this behaviour on RELENG_12. Adding a new vlan causes all vlans on the parent interface to flap. Not the greatest thing as it bounces a LOT of traffic potentially, flaps routing etc. Is there a way around this ? This is on r367411 releng12 igb0@pci0:2:0:0: class=0x020000 card=0x153315d9 chip=0x15338086 rev=0x03 hdr=0x00 vendor = 'Intel Corporation' device = 'I210 Gigabit Network Connection' class = network subclass = ethernet eg. just something simple like ifconfig vlan16 create 10.1.2.3/29 vlandev igb1 vlan 16 # dmesg | tail -8 igb1: link state changed to DOWN vlan16: link state changed to DOWN vlan2049: link state changed to DOWN vlan15: link state changed to DOWN igb1: link state changed to UP vlan16: link state changed to UP vlan2049: link state changed to UP vlan15: link state changed to UP ---Mike
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