From owner-freebsd-net@FreeBSD.ORG Wed Dec 10 17:29:51 2014 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0B78238E for ; Wed, 10 Dec 2014 17:29:51 +0000 (UTC) Received: from mail-pd0-x22c.google.com (mail-pd0-x22c.google.com [IPv6:2607:f8b0:400e:c02::22c]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D0D256A2 for ; Wed, 10 Dec 2014 17:29:50 +0000 (UTC) Received: by mail-pd0-f172.google.com with SMTP id y13so3163417pdi.17 for ; Wed, 10 Dec 2014 09:29:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dpdtech.com; s=google; h=from:content-type:subject:message-id:date:to:mime-version; bh=6DnZ8oGHhfjdHPSvptbk+mFxBau1NsGB1OehBJm/bes=; b=QoTB77tKj1wH3gZuXFGg8Qra76yPtNceAuRHEWLuQObob1LrHRGHcn/WCFp4XwJcpM QErGXP03Adzq+cEkmKmhJeMRJVCbGAdMAtowH4cMJu9v7jrxvhJuR5OGxE9GRI8grEc9 zSIH1kRlSiPzmTmP/1WYt+uTW21GrKI4Cy12s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:content-type:subject:message-id:date:to :mime-version; bh=6DnZ8oGHhfjdHPSvptbk+mFxBau1NsGB1OehBJm/bes=; b=mIjkYYrE4I8Xmuh4HV5bBu96WvdAiKdPRqBvhdcdkvC7gmKC1W+UdBb+ls9/0voPIN 8RCR+9RSW4RYCvRWHAZpejI9a5f3TWzJD0N1BYC7r8+bdeOQnrIc2Z6nF7T0oCWT1/ed k7P8tEr6mcA/R5Rq67DMUMcGeKCsEMqSJ/H5s58Rsg7jTBsMFle5lA82duEp+z1UAQAM xZyIz2Vr88TV03FOvxKWOHIazR38I/4l5du17aCf1DASKFmYDtYV1IMecAgf46hEnjq8 acMWcaF2sogrUSMPHNSzq4HfgLnplx82EuidPRsNG0ehy4NYd6FogwQVSZ4LGooldhJe e9Fg== X-Gm-Message-State: ALoCoQl+ssBVJ++HWqHtl0OOB/98gWtuY6khsB1hOCMT0NC0rcDO56zxtVeIJr0uGrJN12LsSFka X-Received: by 10.70.94.168 with SMTP id dd8mr9284702pdb.76.1418232590365; Wed, 10 Dec 2014 09:29:50 -0800 (PST) Received: from 173-13-188-41-sfba.hfc.comcastbusiness.net (173-13-188-41-sfba.hfc.comcastbusiness.net. [173.13.188.41]) by mx.google.com with ESMTPSA id bu4sm4739659pdb.80.2014.12.10.09.29.49 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 10 Dec 2014 09:29:49 -0800 (PST) From: "David P. Discher" Content-Type: multipart/signed; boundary="Apple-Mail=_3C2EE3BB-0801-427A-B738-C50DB1A2892B"; protocol="application/pgp-signature"; micalg=pgp-sha512 Subject: EM(4) - Link flap when bridged and adding members (em bridge flap) Message-Id: Date: Wed, 10 Dec 2014 09:29:55 -0800 To: FreeBSD Net Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) X-Mailer: Apple Mail (2.1878.6) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Dec 2014 17:29:51 -0000 --Apple-Mail=_3C2EE3BB-0801-427A-B738-C50DB1A2892B Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I=92m seeing this in -head as well as 10-stable (r274577) on two = different sets of hardware.=20 When an em interface is a member of a bridge, (if_bridge(4)), the link = flaps. This is reported on the console as well as can be seen with loss = of connectivity. This seems to be easily replicated. =20 ifconfig bridge0 create ifconfig bridge addm em0 ifconfig epair0 create ifconfig bridge addm epair0a=20 < link flap > Two different systems, the behavior is the same. em0@pci0:6:0:0: class=3D0x020000 card=3D0x109615d9 chip=3D0x10968086 = rev=3D0x01 hdr=3D0x00 vendor =3D 'Intel Corporation' device =3D '80003ES2LAN Gigabit Ethernet Controller (Copper)' class =3D network subclass =3D ethernet em0@pci0:1:0:0: class=3D0x020000 card=3D0x10d315d9 chip=3D0x10d38086 = rev=3D0x00 hdr=3D0x00 vendor =3D 'Intel Corporation' device =3D '82574L Gigabit Network Connection' class =3D network subclass =3D ethernet - David P. Discher http://davidpdischer.com/ AIM: DavidDPD | Y!M: daviddpdz=20 --Apple-Mail=_3C2EE3BB-0801-427A-B738-C50DB1A2892B Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJUiIMTAAoJEEmwU6XuhYWO6GwH/0xqUYesdHnJLuFVFhybunhV L2OZDaESOZamq+3N7cnJ0n5zbHEgEsq8f+q2LLZlZ0BUM9HqgBNo+GQ4rOeTM658 BgvbW8ksBXNdf9qf+8KCUabDnqQhFcOtfm9f4G8Ttaod6rMuHJuQsDwvbG9C2pPj wrM691djoWiOnOC8yrl0fdTacqk0hPG6Ksa2iGZrW7+c4QZaMbgWzj7wcBCuUIQx dqPPbJaDaGeLjnJN6EkDklJ702VCEPCOy//oC0JH5r7yvEWE2oGAvleh51ZzGzmV c1kdh8xA2n0F+bYwT0bv4p9QWH65lvSq6JXO7aOee+7NtA0llHFN891IzKvITmY= =PXDN -----END PGP SIGNATURE----- --Apple-Mail=_3C2EE3BB-0801-427A-B738-C50DB1A2892B--