From owner-freebsd-net@FreeBSD.ORG Thu Dec 11 01:21:03 2014 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id C1F7A2AA for ; Thu, 11 Dec 2014 01:21:03 +0000 (UTC) Received: from mail-pa0-x22d.google.com (mail-pa0-x22d.google.com [IPv6:2607:f8b0:400e:c03::22d]) (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 8B5C4160 for ; Thu, 11 Dec 2014 01:21:03 +0000 (UTC) Received: by mail-pa0-f45.google.com with SMTP id lf10so3326119pab.18 for ; Wed, 10 Dec 2014 17:21:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dpdtech.com; s=google; h=content-type:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=YoXC6gULbetvmhF3Wu2BhY06TzUJG5kZoDgReoCpmxA=; b=ZTHWmHNVTagdMX1+pqva7cYUhM4I2YT73qh34WjXRtvuzjRsnGoOIBEfnezYis4T+2 Q4H8soYNO1kybKdUWVo/oGfJ4iv3WLBSizZn/UrYSXp07nCoFZmIACXLcqxpg8R1sra7 R/OLO0mRx1xhRk54sUlLsFS04IGESSW8z3FZU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:cc:message-id:references:to; bh=YoXC6gULbetvmhF3Wu2BhY06TzUJG5kZoDgReoCpmxA=; b=ToIlaL9iBAu0zYpNuxw3NrIcVmADx+8R3E94tE42mH33Jkme0qED0W0VT2pqnIq3TO rDka1Q/p2toJcKNOakrg/JzlXNINa4YUN/Li3us1atXzlIJcY79NlTlskn0gWc9qefHe CL1iSjuRKfFNQSqD5vo76QDF8KHfY/pIxgBQo1vYzNNHjN67XHKBFI2kPrItY88fCUDb XGsuMyg47cpXimvGKoDE2L4hVcRa5lAwLM56Lorm4uATSxt5UMvRyBLrttHOjarDvUCz RDCsI+T6dwAQOliXmKT76RKhkT62fuRTQEZu2ENoX9WIaeuL3YtIIJOoMeEjqrK/FFdo 4zLQ== X-Gm-Message-State: ALoCoQmBIo+3SGMggAD/SPCq8UNXR4b5Zdk+XnPxnxn3JAitpRCV4xd7WuvpZtEZZEqlBzrzNgCe X-Received: by 10.68.95.3 with SMTP id dg3mr12607749pbb.12.1418260862843; Wed, 10 Dec 2014 17:21:02 -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 qh4sm5292645pbb.35.2014.12.10.17.21.01 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 10 Dec 2014 17:21:02 -0800 (PST) Content-Type: multipart/signed; boundary="Apple-Mail=_8AB70AB4-13BF-4236-A3E3-14FB39D4D3CD"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: EM(4) - Link flap when bridged and adding members (em bridge flap) From: "David P. Discher" In-Reply-To: Date: Wed, 10 Dec 2014 17:21:10 -0800 Message-Id: <66917960-0AEC-484C-929C-4B3461FE68E4@dpdtech.com> References: To: Ryan Stone X-Mailer: Apple Mail (2.1878.6) Cc: FreeBSD Net 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: Thu, 11 Dec 2014 01:21:03 -0000 --Apple-Mail=_8AB70AB4-13BF-4236-A3E3-14FB39D4D3CD Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Thanks ryan - this did appear work around the issue. - David P. Discher http://davidpdischer.com/ AIM: DavidDPD | Y!M: daviddpdz On Dec 10, 2014, at 10:25 AM, Ryan Stone wrote: > From a quick look at the code, whenever an interface is added to a > bridge, if that interface does not support a feature currently enabled > on the bridge then it has to disable that feature on all member > interfaces of that bridge. That would re-init the em interface, which > would cause a link flap. > > Take a look at the ifconfig output for em0 and epair0 before epair0 is > added to the bridge. You will probably see that one or more features > that em supports is not supported by epair (I would bet on something > like LRO or TSO).. The solution would be to disable those features > from em0 before adding it to the bridge (you can persist this in > rc.conf with ifconfig_em0="...") --Apple-Mail=_8AB70AB4-13BF-4236-A3E3-14FB39D4D3CD 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 iQEcBAEBCgAGBQJUiPGGAAoJEEmwU6XuhYWOmRcIAJC3dhd2x0hQ9io34h5SJlHG ZPMn4NNWCb9RM1oO6btq/oSlpOjpfEN07Cao9drS2qwCX18MG04PkmSelZLKeYcD bsPqUtyvjJOPZxf3RViWZtRTzN84NLWKV932zHm5sN45s4UeDGNy39GHw0sTv6zd bHZAXEiDeZGyLXCOQ3p6gsG9pJ1jxQfdmRfvoBQS3+011nvaHWrdvtObtVS+qSWj TcbR46Uu9sySRszLEBPcV/SQFWtdk67lJdH235gJn9ywlxkUW6/VzNnstwlPDktI pheHWIsmzfKsUnLjmRJ32ed1mHCAHP+5yxJfai0uS9KsbTAEfd8E5fwojb/daIE= =Le6k -----END PGP SIGNATURE----- --Apple-Mail=_8AB70AB4-13BF-4236-A3E3-14FB39D4D3CD--