From mboxrd@z Thu Jan 1 00:00:00 1970 From: Willy Tarreau Subject: Re: new ipdelay= option for faster netboot Date: Tue, 18 Aug 2009 06:56:03 +0200 Message-ID: <20090818045603.GD11624@1wt.eu> References: <20090814204305.GA31727@pengutronix.de> <4A89AC40.2040109@am.sony.com> <4A89DB15.6060101@am.sony.com> <20090817.180323.253692704.davem@davemloft.net> <4A8A0454.8000902@hp.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: david@lang.hm Cc: Rick Jones , David Miller , tim.bird@am.sony.com, r.schwebel@pengutronix.de, vda.linux@googlemail.com, linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org, arjan@linux.intel.com, kernel@pengutronix.de, netdev@vger.kernel.org On Mon, Aug 17, 2009 at 07:45:33PM -0700, david@lang.hm wrote: > On Mon, 17 Aug 2009, Rick Jones wrote: > > >David Miller wrote: > >>I have card/switch combinations that take up to 10 seconds to > >>negotiate a proper link. > > > >Gotta love it when things adhere to specs... > > the default on Cisco switches is to wait 30 seconds before fully enabling > the port so that it can listen for spanning tree broadcasts. And this causes a lot of trouble in high availability environments, because the link is up but unusable. So if you're using it as a primary bond link you can lose connectivity for that time. Fortunately, you can configure the port in "switchport mode access", "portfast" mode to avoid this annoying delay. Willy